Fonte: <a href="http://www.rimtai.com.tw/chtr/Products/MFJ/Products/MFJ-ANALYZER/MFJ259BCali.htm">http://www.rimtai.com.tw</a><br><br><br><br><font style="color: rgb(0, 153, 0);" size="4"><i><b><font face="細明體">MFJ 259B Analyzer Calibration</font></b></i></font>
<p align="left"><b><font face="細明體"><i>This is an MFJ procedure that does not contain any
information that would not be handed out by them. It is easy-access to a test
procedure, that is all it is. It is a shortcut to help you.?/b></i></font></b></p>
<p align="left"><b><font face="細明體"><i>This information is here only because it is the correct
way to calibrate the MFJ-259B analyzer. MFJ's first priority is making sure
people who can not send units back to MFJ or who want to verify calibration with
a correct reviewed and edited procedure have something easy to access. MFJ gets
all the credit for this procedure, no one else.</i></font></b></p>
<p align="left"><b><font face="細明體"><i>It is best that no one copy this, and start handing it out
in mass. The only reason for this is there should be a point of control of
information, so it can be corrected as errors are found.</i></font></b></p>
<h3 align="left"><b><font face="細明體">Common Problems</font></b></h3>
<b> </b><p class="MsoNormal"><b><font face="細明體">This family of analyzers is dc-coupled from the bridge to the antenna port. The bridge detectors are NOT
frequency selective, and respond to anything from minor dc offsets through microwave
signals. This causes a potential problem if there is <i> any</i> voltage appearing
across the antenna port, from dc through microwave. (This is also true for competing
analyzers from other manufacturers.)糍here are multiple reasons why, at
the time of design, these units were dc coupled with broadband detectors.
Hopefully someday a higher cost-design with selective detectors will become
available, but for right now this is all that is available for amateur use.?/p>
</font>
</b></p><p class="MsoNormal"><b><font face="細明體">Because the detector is broadband, and because it is dc
coupled to the antenna, any external voltage across the input port causes
measurement errors. It is the accumulated
voltage of multiple sources that is most important, not the strength of any individual signal.
Because of that, large antennas should be tested at times when propagated
signals in the range of the antenna's response are at minimum strength.?/p>
</font>
</b></p><p class="MsoNormal"><b> <font face="細明體">A definite RFI improvement occurs with a bandpass
filter, but multiple-section bandpass filters cause impedance measurement problems.
Multiple-section filters behave like transmission lines of random line
impedances, loss, and lengths as frequency is varied. The best solution is to
use a single-stage bandpass filter
and dc isolation on large arrays or with long feedlines. I often use a good
1:1 isolation transformer for measurements, and often find a parallel L/C
filter (like the MFJ-731 Filter) useful.? ?/p>
</font>
</b></p><p class="MsoNormal"><b><font face="細明體">The detector diodes clearly stand out as the most easily damaged
devices in the analyzer. If you have a sudden problem, it is most likely a
defective detector diode.?/p>
</font>
</b></p><p class="MsoNormal"><b><font face="細明體">In order for the detectors to be accurate within a
fraction of a percent (one bit), detector diodes must have very low
capacitance and a very low threshold voltage. This means the diodes, through
necessity, must be low-power zero-bias Schottky microwave detector diodes. The
same characteristics that make them accurate and linear cause the diodes to be
especially sensitive to damage from small voltage spikes. <i>ALWAYS
discharge large antennas before connecting them to the analyzer! Never apply
external voltages greater than 3 volts to the antenna port!</i></font></b></p>
<b> </b><h2><b><font face="細明體">How This Unit Works</font></b></h2>
<b> </b><p class="MsoNormal"><b> <font face="細明體">This is a
rough summary of how this unit works:</font></b></p>
<b> </b><p class="MsoNormal"><b><font face="細明體">The MFJ-259B, and other digitized MFJ antenna analyzers,
compare three major voltages in a 50-ohm bridge circuit. They are:</font></b></p>
<b> </b><h4><b><font face="細明體">Vz= Voltage across the load. This voltage is called? Z in the alignment display menu</font></b></h4>
<b> </b><h4><b><font face="細明體">Vr= Voltage indicating bridge balance. This voltage
is called R in the alignment display menu</font></b></h4>
<b> </b><h4><b><font face="細明體">Vs= Voltage across a 50-ohm resistor between the RF
source and the load. This voltage is called S in the alignment display
menu?/h4>
</font>
</b><p class="MsoNormal"><b><font face="細明體">孭ll
voltages are converted through an eight-bit A-D converter to a 256-bit
digitized output with a test-display range of 0-255 bits. By knowing
the ratio of these voltages, as compared to the regulated RF source
voltage, many different load parameters can be calculated. An antenna
analyzer could calculate everything (except sign of reactance) from
measuring only Vs and Vz, but at certain impedances any small error in
either Vs and Vz becomes critical. This is especially true when voltage
is digitized into a 256-bit format (~0.4% steps). At certain
impedances, an almost immeasurable? voltage change will cause a sudden
large jump in the measured impedance parameters.</font></b></p>
<b> </b><p class="MsoNormal"><b><font face="細明體">To reduce display impedance jumps, SWR is weighed into the
calculation of reactance and resistance at low SWR values. (An SWR
bridge is most accurate when the load is closest to 50 ohms, which is a
primary measurement area where?impedance measurements through Vz and Vs
become critical.) By factoring in a direct SWR measurement from an internal
bridge, the analyzer can
check and "correct" any small level errors in Vs or Vz. This reduces the
impedance jump that would occur with a one-bit jump in voltage. This also why bits
must be calibrated for near-perfect accuracy. a one-bit error can cause a
resistive load to appear reactive (the total of Vs and Vz must always be 255
bits or less for a load to be considered resistive).</font></b></p>
<b> </b></h4><h2 align="left"><b><font face="細明體">Calibrating the MFJ-259B Antenna Analyzer</font></b></h2>
<b> </b><p class="MsoNormal"><b><font face="細明體">This
calibration procedure is the correct procedure for later MFJ-259B's. Disregard
any other information. Since MFJ-259B software has been changed under the same
model number, you may find some final performance
test steps not valid. These steps will involve parameters that do not appear
on the display.</font></b></p>
<b> </b><p class="MsoNormal"><b><font face="細明體">Be sure you have printed a copy of the board layout
showing adjustment points, have read all this, and have suitable loads before
proceeding.?</font></b></p>
<b> </b><h2><b><font face="細明體">Adjustments</font></b></h2>
<b> </b><p class="MsoNormal"><b><font face="細明體">This unit has tracking and gain adjustments for Vz, Vs,
and Vr. Tracking is set at low voltages (low bits). Gain is set at high
voltages or bits. Together they make the detector voltage output closely track
the actual RF voltage.?/p>
</font>
</b></p><p class="MsoNormal"><b><font face="細明體">This unit also has meter calibration adjustments. The
analog meters almost certainly suffer from some scale linearity problems, they
will be somewhat less accurate than the digital display. These adjustments only affect
analog meter readings. The meter adjustments
do not affect the display.</font></b></p>
<p class="MsoNormal"><b><font face="細明體">Quiescent current (bias) in the RF amplifier section is
adjustable. This adjustment directly affects output signal harmonic content.
Harmonics are worse with low supply voltages, and with low impedance loads. <i>Be sure
you check the harmonics as outlined below, with a 1/4 wl open-circuit stub!!</i></font></b></p>
<p class="MsoNormal"><b><font face="細明體">Excessive harmonics can cause severe errors in measurement of
frequency-selective loads, even when dummy-load SWR tests appear perfect. Loads most sensitive to harmonic-induced errors
include, but are not limited to, antenna tuners, tank
circuits, very short resonant antennas, and distance to fault and stub length
measurements. If you notice something "funny" going on with a stub
measurement, it may be a fault of incorrect bias.?/p>
</font>
</b></p><h4><b><font face="細明體"><font size="4">Warning: </font> Never calibrate around a sudden
"problem" that appears. If a detector suddenly shifts voltage, the
problem is almost certainly a defective detector diode. If the meter is recalibrated
with a defective (leaky) diode, the meter will probably NOT track correctly with
frequency.</font></b></h4>
<b> </b><h1 align="center"><b><font face="細明體">Alignment </font> </b></h1>
<b> </b><p class="MsoNormal"><b><b style=""><font face="細明體">Tools and
Equipment: </font>
</b></b></p>
<b> </b><p class="MsoNormal"><b><font face="細明體">[<span style="">?</span>] #2 and
#1 Phillips-head screwdrivers</font></b></p>
<b> </b><p class="MsoNormal"><b><font face="細明體">[<span style="">?</span>] Digital
meter or accurate analog meter for
checking supply voltage</font></b></p>
<b> </b><p class="MsoNormal"><b><font face="細明體">[<span style="">?</span>] Small
set of non-metallic alignment wands for coils, or small jeweler's screwdrivers
for controls?/p>
</font>
</b></p><p class="MsoNormal"><b><font face="細明體">[<span style="">?</span>] Power
supply, regulated to 12-volts + - 5%</font></b></p>
<b> </b><p class="MsoNormal"><b><font face="細明體">[<span style="">?</span>]
General-coverage receiver with level meter or Spectrum Analyzer (these are
optional with additional work and use of a stub)?/p>
</font>
</b></p><p class="MsoNormal"><b><font face="細明體">[<span style="">?</span>] ~10 MHz
1/4wl open-stub,</font><span style=""><font face="細明體">?/span>for example 15?good-quality
solid-dielectric RG-8, UHF connector at on end, open on other (not needed with
analyzer or receiver)</font></span></b></p>
<p class="MsoNormal"><b><font face="細明體">[?] 2.2-ohm 1/4 or 1/2 watt film resistor (not needed
with stub)?</font></b></p>
<b> </b><p class="MsoNormal"><b><font face="細明體">[?] Accurate
load set
to include:</font></b></p>
<b> </b><p class="MsoNormal" style="margin-left: 0.75in; text-indent: -0.25in;">
<b> <font face="細明體">A.<span style="font-style: normal; font-variant: normal; font-weight: normal; font-size: 7pt; line-height: normal; font-stretch: normal; font-size-adjust: none;">??
</span>Short</font></b></p>
<b> </b><p class="MsoNormal" style="margin-left: 0.75in; text-indent: -0.25in;">
<b> <font face="細明體">B.<span style="font-style: normal; font-variant: normal; font-weight: normal; font-size: 7pt; line-height: normal; font-stretch: normal; font-size-adjust: none;">??
</span>12.5-W<b style="">
</b>load</font></b></p>
<b> </b><p class="MsoNormal" style="margin-left: 0.75in; text-indent: -0.25in;">
<b> <font face="細明體">C.<span style="font-style: normal; font-variant: normal; font-weight: normal; font-size: 7pt; line-height: normal; font-stretch: normal; font-size-adjust: none;">?? </span>50-W
load</font></b></p>
<b> </b><p class="MsoNormal" style="margin-left: 0.75in; text-indent: -0.25in;">
<b> <font face="細明體">D.<span style="font-style: normal; font-variant: normal; font-weight: normal; font-size: 7pt; line-height: normal; font-stretch: normal; font-size-adjust: none;">?? </span>75-W
load</font></b></p>
<b> </b><p class="MsoNormal" style="margin-left: 0.75in; text-indent: -0.25in;">
<b> <font face="細明體">E.<span style="font-style: normal; font-variant: normal; font-weight: normal; font-size: 7pt; line-height: normal; font-stretch: normal; font-size-adjust: none;">??
</span>100-W
load</font></b></p>
<b> </b><p class="MsoNormal" style="margin-left: 0.75in; text-indent: -0.25in;">
<b> <font face="細明體">F.<span style="font-style: normal; font-variant: normal; font-weight: normal; font-size: 7pt; line-height: normal; font-stretch: normal; font-size-adjust: none;">??
</span>200-W
load</font></b></p>
<b> </b><h4><b><font face="細明體">Note 1:
Loads must be constructed using physically small 1% carbon-film
resistors.? </font></b></h4>
<ul><b> </b><li>
<b> </b><h4><b> <font face="細明體">DO NOT use large resistors. Acceptable results will be obtained when load resistors
are mounted in the very bottom of a UHF-male connector.? </font> </b></h4>
<b> </b></li><b> </b><li>
<b> </b><h4><b> <font face="細明體">The ideal
load resistors are surface-mount precision-resistors, but other styles will
work. It is acceptable to parallel multiple resistors to obtain low
resistances, but don't series connect more than two resistors!? </font> </b></h4>
<b> </b></li><b> </b><li>
<b> </b><h4><b><font face="細明體">Never use physically
large resistors, such as 1-watt or larger resistors, unless you are absolutely
positive they are composition-types (very rare).? </font> </b></h4>
<b> </b></li><b> </b><li>
<b> </b><h4><b> <font face="細明體">Since the loads are used to
set the number of bits in critical calculations, the maximum reactance error
will always be worse than the percentage of resistive load error. A one bit
error in calibration (~ .4%) can shift a resistive load to read reactance.
</font>
</b></h4>
<b> </b></li></ul>
<b> </b><h4><b><font face="細明體">Quick-connect loads can be made with surface mount? resistors
on a BNC male chassis mount connector with the bayonet removed. This makes
a 弾uick connect?connector that will slide directly into a type-N female.?In this
case, use a good UHF to BNC female adaptor for the 259 units. With a 269, the
load will plug directly in to the N female.? </font> </b></h4>
<b> </b><p class="MsoNormal"><b><font face="細明體">Note 2: The power source should be the LOWEST expected
operating voltage. DO NOT use a standard "wall-wart" or batteries! You can
reduce voltage from a conventional 13.8v regulated supply by adding a few
series diodes. Silicon diodes will normally drop about 0.6volts or so per
diode. Three or four diodes will reduce place the voltage below 12 volts.</font></b></p>
<b> </b><p class="MsoNormal"><b><font face="細明體">WARNING: The MFJ-1315 AC adapter or other
"wall-warts" should NOT
be used to power the unit for most alignment steps.?/b></font></b></p>
<b> </b><h3><b><font face="細明體">Step 1</font></b></h3>
<b> </b><p><b><font face="細明體"><b style="">Visual
Inspection:</b>
Before, during, and after calibration, be mindful of physical
condition. Watch for missing or loose hardware. Do not tug, stress, or
repeatedly flex leads, or carelessly flop or toss things about. Keep
your bench clean. Follow these rules the entire time you have the unit
apart!</font></b></p>
<b> </b><h3><b><font face="細明體">Step 2</font></b></h3>
<b> </b><p><b><font face="細明體"><b style="">Battery
Tray Removal: </b>This step provides access to trim-pots and most inductor
adjustments.<b style="">
</b></font></b></p>
<b> </b><p class="MsoNormal"><b><font face="細明體">[?] Remove
last two batteries at each end of the tray.</font></b></p>
<b> </b><p class="MsoNormal"><b><font face="細明體">[?] Remove
two screws (right side) and extract the tray.</font></b></p>
<b> </b><p class="MsoNormal"><b><font face="細明體">[?] Always
position the battery tray to minimize strain on wires.?/p>
</font>
</b></p><p class="MsoNormal"><b><b style=""></b><font face="細明體">Refer to the
board layout pictorial for specific control
locations.</font></b></p>
<b> </b><h3><b><font face="細明體">Step 3</font></b></h3>
<b> </b><p><b><b style=""><span style="text-decoration: none;"></span>
<font face="細明體">Band Overlapping: </font> </b><font face="細明體">Each
band should overlap the next by a small amount to ensure gap-free coverage
from 1.8 MHz to 170 MHz. While viewing the <i style="">LCD
Frequency Display</i>, wiggle the bandswitch from side-to-side gently. Watch
for any display or meter dropout. Check each band as follows:</font></b></p>
<b> </b><p class="MsoNormal"><b><font face="細明體">[?] <b style="">114-170
MHz:</b> Oscillator tunes from below 114.0 MHz to above 170.0 MHz. Check tune
for dead spots.</font></b></p>
<b> </b><p class="MsoNormal"><b><font face="細明體">[?] <b style="">70-114
MHz:</b> Oscillator tunes from below 70.0 MHz to above 114.0 MHz</font></b></p>
<b> </b><p class="MsoNormal"><b><font face="細明體">[?] <b style="">27-70
MHz:</b> Oscillator tunes from below 27.0 MHz to above 70.0 MHz.</font></b></p>
<b> </b><p class="MsoNormal"><b><font face="細明體">[?] <b style="">10-27
MHz:</b> Oscillator tunes from below 10.0 MHz to above 27.0 MHz.</font></b></p>
<b> </b><p class="MsoNormal"><b><font face="細明體">[?] <b style="">4-10
MHz:</b> Oscillator tunes from below 4.0 MHz to above 10.0 MHz.</font></b></p>
<b> </b><p class="MsoNormal"><b><font face="細明體">[?] <b style="">1.8-4
MHz:</b> Oscillator tunes from below 1.8 MHz to above 4.0 MHz. Check tune for
dead spots.</font></b></p>
<b> </b><p class="MsoNormal"><b><font face="細明體"><i>While verifying overlap, check at least the lowest and
highest bands carefully for dead spots. The <i style="">LCD
Display</i> will indicate 000.000MHz if a dead spot occurs. Dead spots
generally indicate a defective tuning capacitor (</i><i style="">TUNE</i></font><i><font face="細明體">).?/i>
</font>
</i></b></p>
<b><i> </i></b><p class="MsoNormal"><b><i><font face="細明體">If you find the switch causes a dropout the switch
may have dry or dirty contacts, or poor solder joints. Check the solder joints first.
If you must clean and lubricate the switch, be aware it is a difficult task. The entire
board needs to be lifted from the case front. Dirty band-switch contacts may be restored with
spray tuner
cleaners. The best place to spray the switch is from
the front side (shaft side), right below the nut. You must remove the switch
indexing tab retainer nut and the
metal switch retainer (stop)
under the nut. Be sure the stop goes back exactly as removed.
</font>
</i></b></p>
<p class="MsoNormal"><b><i><font face="細明體">To correct overlap problems, locate and retune the appropriate VFO
coil (see Pictorial for coil locations). Note that L1-L4 are slug-tuned and
require an insulated hex-head tuning wand. If you use the wrong size wand or a
worn wand, it will break a slug!? </font></i></b></p>
<p class="MsoNormal"><b><i><font face="細明體">Inductors L5 and L6 are located on the
component side of the board and are compression-tuned (press turns closer
together to lower frequency or spread apart to raise frequency). Make only
very small corrections--<i style="">especially to L5
or L6</i>--and recheck the band you are adjusting. You should also check the next
lower band after each adjustment to ensure that the lower band hasn't
moved excessively.
</font>
</i></b></p>
<b><i> </i></b><h4><b><i><font face="細明體"><b style="">Important
Warning:</b>
VFO coils MUST be aligned from highest frequency to lowest frequency.
The next higher range affects next lower band the greatest amount.? Do
not attempt VFO coil adjustment unless you are experienced working with
VHF-LC circuitry or complex alignment procedures.?/h4> </font>
</i></b></h4><h3><b><i><font face="細明體">Step 4</font></i></b></h3>
<b><i> </i></b><p><b><i><font face="細明體">Harmonic Suppression/ Bias: Connect the analyzer exactly as
shown below.?/p>
</font>
</i></b></p><ul><b><i> </i></b><li><b><i><font face="細明體">糍he impedance of the cable to the measurement device should match
the impedance of the measurement device.</font></i></b></li><b><i> </i></b><li><b><i><font face="細明體">糍he "T" must be connected either directly to or placed
within a few inches of the analyzer.</font></i></b></li><b><i> </i></b><li><b><i><font face="細明體">糍he power source must be the lowest expected operating voltage.</font></i></b></li><b><i> </i></b><li><b><i><font face="細明體">糍he measurement device must be well-shielded, and not pick up any
substantial signal from the analyzer when the "T" is
disconnected from the analyzer.</font></i></b></li></ul>
<b><i> </i></b><p><b><i><font face="細明體"><img src="http://www.rimtai.com.tw/chtr/Products/MFJ/Products/MFJ-ANALYZER/Copy_of_MFJ259-1.gif" border="0" height="401" width="401">
</font> </i></b></p>
<b><i> </i></b><h3><b><i><font face="細明體">Step 5?/h3>
<span style="text-decoration: none;"><b style="">Harmonic Suppression
(</b><b style="text-decoration: none;">bias
</b><b style="">R89):</b>
This adjustment reduces oscillator harmonics. Harmonics will cause incorrect
readings under some load conditions.? </span>
</font>
</i></b><p><span style="text-decoration: none;"><b><i><font face="細明體"><font size="4">WARNING:</font>? Incorrect
adjustment of R89?will NOT show when checking with resistive dummy loads!!!
The unit will appear to calibrate correctly, but will produce errors in
stub length, distance-to-fault, and other frequency selective functions.
</font>
</i></b></span>
<b><i> </i></b></p>
<b><i> </i></b><p><span style="text-decoration: none;"><b><i><font face="細明體">When
R89 is set properly, harmonic suppression of ?0 to ?5dBc should be
possible across most of the analyzer旧 tuning range. This particular
adjustment must be made at the lowest expected operating voltage.
Proper alignment requires a 12.0-volt regulated supply as a power
source. NEVER use an AC adapter or any supply voltage higher than
12-volts when making this adjustment.?/span>A calibrated spectrum
analyzer works best for monitoring harmonic output, but a well-shielded
general-coverage receiver with signal-level meter will also
work.?/span>The receiver MUST be "T'd" into the analyzer just as the
spectrum analyzer is, and the Tee and resistor must be located at the
analyzer connector.啱f you do not have a good-quality receiver or
spectrum?analyzer, use the test mode of the analyzer with a stub. Watch
MFJ analyzer test-mode Vz. Test-mode Vz will roughly indicate total
harmonic voltage when the analyzer is set at the stub's exact resonant
frequency. Entering the test mode is described in Detector Calibration
(Step 6).???
</font>
</i></b></span></p>
<b><i> </i></b><p class="MsoNormal"><b><i><font face="細明體">[?] a. Install
either a 15?RG-8 open stub, or resistor and measurement device, and tune analyzer to approximately <b style="">10 MHz</b>.?/p>
</font>
</i></b></p><p class="MsoNormal"><b><i><font face="細明體">[?] b. (stub and internal Vz use only) Observing Vz on the data
display (analyzer test mode), adjust frequency until the lowest fundamental
output reading (or lowest impedance) is obtained. You should clearly see the
MFJ analyzer's fundamental frequency
output voltage (Vz) go through a deep null.?/p>
</font>
</i></b></p><p class="MsoNormal"><b><i><font face="細明體">[?] c. Observe the analyzer
frequency reading. This is the approximate resonant frequency of the stub, and
the <u>test frequency</u>.?/p>
</font>
</i></b></p><p class="MsoNormal"><b><i><font face="細明體">[?] d. Without
changing the analyzer <u>test frequency</u> setting, observe the second
harmonic level. This harmonic will be at twice the MFJ analyzer frequency counter reading<b style="">.</b>.</font></i></b></p>
<b><i> </i></b><p class="MsoNormal"><b><i><font face="細明體">[?] e. Adjust <b style="">R89</b>
for <b style="">lowest 2nd harmonic meter reading </b>on the receiver, lowest Vz test-menu reading,
or lowest harmonic level?on the spectrum analyzer. Be SURE the fundamental
frequency level remains nulled in the analyzer.?/p>
</font>
</i></b></p></h3><h4><b><i><font face="細明體"><font size="4">WARNING:</font>?Always repeat steps
(b) through (e) at least one extra time when relying on display Vz. The original null point of
any stub will shift if there is a substantial reduction in harmonics after R89
is adjusted. The original stub frequency, as observed at (c), will probably change slightly. It is NOT necessary to recheck
when doing a resistor load test with a good-quality spectrum analyzer
or receiver. With a resistor, exact test frequency is NOT critical.</font></i></b></h4>
<b><i> </i></b><h4><b><i><font face="細明體"><font size="4">NOTE:</font> If you have a poorly performing spectrum
analyzer or receiver with limited dynamic range, use a stub with the spectrum
analyzer or receiver instead of a 2.2 ohm resistor. If you have a reasonable
quality spectrum analyzer or receiver (at least 50dB dynamic range) use a 2.2-ohm
non-inductive resistor in lieu of the stub, resistor adjustment is easier and
more accurate.</font></i></b></h4>
<b><i> </i></b><h3><span style="font-size: 18pt;"><b><i><font face="細明體">Detector
Calibration </font>
</i></b></span></h3>
<b><i> </i></b><h3><b><i><font face="細明體">Step 6:?/h3>
</font>
</i></b><p class="MsoNormal"><b><i><font face="細明體">This critical sequence calibrates A-D conversion for various load conditions. If you
know your unit has been tampered with, preset trim pots <b style="">R88</b>,
<b style="">R89</b>, and <b style="">R90</b> to their center positions before continuing. If you find any
control bottoms-out in adjustment, you almost certainly have installed an
incorrect load or the analyzer has a defective detector diode.?</font></i></b></p>
<b><i> </i></b><p class="MsoNormal"><b><i><font face="細明體">To prepare for detector tracking alignment, place the
analyzer in <i style="">Test Mode. </i>Entering test
mode may be tricky with some units, and it may take practice. To enter <i style="">Test
Mode</i>:
</font>
</i></b></p>
<b><i> </i></b><p class="MsoNormal"><b><i><font face="細明體">[?] Turn
power off.
</font></i></b></p>
<b><i> </i></b><p class="MsoNormal"><b><i><font face="細明體">[?] Hold
down <i style="">MODE </i>and</font><i style=""><font face="細明體"> GATE?/i> buttons while restoring power.</font></i></i></b></p>
<b><i><i style=""> </i></i></b><p class="MsoNormal"><b><i><i style=""><font face="細明體">[?] As
display comes up, slowly (about 1 second period) rock between pushing the MODE and GATE switches alternately (the
best method is to use two fingers, and rock your hand from side to side
between the two buttons)</font></i></i></b></p>
<b><i><i style=""> </i></i></b><p class="MsoNormal"><b><i><i style=""><font face="細明體">[?] Confirm
analyzer has entered test mode (it may take more than one try).</font></i></i></b></p>
<b><i><i style=""> </i></i></b><p class="MsoNormal"><b><i><i style=""><font face="細明體">[?] Using
the MODE button, advance display to
the <b style="">R-S-Z</b> screen (shown below).</font></i></i></b></p>
<b><i><i style=""> </i></i></b></h3><h4><b><i><i style=""><font face="細明體"><font size="4">Note:</font> If you go past the R-S-Z screen, you can still
see R-S-Z by pushing and holding the MODE button.</font></i></i></b></h4>
<b><i><i style=""> </i></i></b><p class="MsoNormal"><b><i><i style=""><font face="細明體">?o:p>
</font>
</i></i></b></p>
<b><i><i style=""> </i></i></b><p class="MsoNormal" style="text-align: center;" align="center">
<b><i><i style=""> <font face="細明體">
<span style="left: 215px; position: absolute; top: -2px; width: 3px; height: 42px; z-index: 3;">
<img src="http://www.rimtai.com.tw/chtr/Products/MFJ/Products/MFJ-ANALYZER/images/calibr2.gif" height="42" width="3"></span>
<span style="left: 359px; position: absolute; top: -2px; width: 3px; height: 42px; z-index: 2;">
<img src="http://www.rimtai.com.tw/chtr/Products/MFJ/Products/MFJ-ANALYZER/images/calibr3.gif" height="42" width="3"></span>
<span style="left: 215px; position: absolute; top: -2px; width: 147px; height: 3px; z-index: 1;">
<img src="http://www.rimtai.com.tw/chtr/Products/MFJ/Products/MFJ-ANALYZER/images/calibr4.gif" height="3" width="147"></span><b style="">10.000
MHz
</b></font></i></i></b></p>
<b><i><i style=""> </i></i></b><h2><b><i><i style=""><font face="細明體">???????????????????????? Rxxx???Sx<span style="font-weight: normal;">xx</span>??/span><span style="font-weight: normal;">
</span>?Zx<span style="font-weight: normal;">xx</span></font></i></i></b></h2>
<b><i><i style=""> </i></i></b><p class="MsoNormal">
<b><i><i style=""> <font face="細明體">
<span style="position: absolute; left: 215px; top: -1px; width: 147px; height: 3px; z-index: 4;">
<img src="http://www.rimtai.com.tw/chtr/Products/MFJ/Products/MFJ-ANALYZER/images/calibr5.gif" height="3" width="147"></span>?o:p>
? <br style="" clear="all">
[?] Tune
analyzer operating frequency to approximately <b style="">10.000
MHz</b>
</font></i></i></b></p>
<b><i><i style=""> </i></i></b><p class="MsoNormal"><b><i><i style=""><font face="細明體">[?] Leave antenna
connector <b style="">Open</b></font></i></i></b></p>
<b><i><i style=""> </i></i></b><p class="MsoNormal"><b><i><i style=""><font face="細明體">[?] Set <b style="">R72</b>
for <b style="">Z=255</b></font></i></i></b></p>
<b><i><i style=""> </i></i></b><p class="MsoNormal"><b><i><i style=""><font face="細明體">[?] Install
the <b style="">Short</b></font></i></i></b></p>
<b><i><i style=""> </i></i></b><p class="MsoNormal"><b><i><i style=""><font face="細明體">[?] Set <b style="">R73</b>
for <b style="">S=255</b></font></i></i></b></p>
<b><i><i style=""> </i></i></b><p class="MsoNormal"><b><i><i style=""><font face="細明體">[?] Install <b style="">12.5-W
</b>load</font></i></i></b></p>
<b><i><i style=""> </i></i></b><p class="MsoNormal"><b><i><i style=""><font face="細明體">[?] Set <b style="">R90</b>
for <b style="">Z=051</b></font></i></i></b></p>
<b><i><i style=""> </i></i></b><p class="MsoNormal"><b><i><i style=""><font face="細明體">[?] Set <b style="">R53</b>
for <b style="">R=153</b></font></i></i></b></p>
<b><i><i style=""> </i></i></b><p class="MsoNormal"><b><i><i style=""><font face="細明體">[?] Install <b style="">200-W
</b>load</font></i></i></b></p>
<b><i><i style=""> </i></i></b><p class="MsoNormal"><b><i><i style=""><font face="細明體">[?] Set <b style="">R88</b>
for <b style="">S=051</b></font></i></i></b></p>
<b><i><i style=""> </i></i></b><p class="MsoNormal"><b><i><i style=""><font face="細明體">[?] Set <b style="">R72</b>
for <b style="">Z=204</b></font></i></i></b></p>
<b><i><i style=""> </i></i></b><p class="MsoNormal"><b><i><i style=""><font face="細明體">[?] Install <b style="">75-W
</b>load</font></i></i></b></p>
<b><i><i style=""> </i></i></b><p class="MsoNormal"><b><i><i style=""><font face="細明體">[?] Set <b style="">R89</b>
for <b style="">R=051
</b></font></i></i></b></p>
<b><i><i style=""> </i></i></b><p class="MsoNormal"><b><i><i style=""><font face="細明體">[?] Install <b style="">12.5-W
</b>load</font></i></i></b></p>
<b><i><i style=""> </i></i></b><p class="MsoNormal"><b><i><i style=""><font face="細明體">[?] Reset <b style="">R90</b>
for <b style="">Z=051</b></font></i></i></b></p>
<b><i><i style=""> </i></i></b><p class="MsoNormal"><b><i><i style=""><font face="細明體">[?] Set <b style="">R73</b>
for <b style="">S=204</b></font></i></i></b></p>
<b><i><i style=""> </i></i></b><p class="MsoNormal"><b><i><i style=""><font face="細明體">[?] Reset <b style="">R53</b>
for <b style="">R=153</b></font></i></i></b></p>
<b><i><i style=""> </i></i></b><p class="MsoNormal"><b><i><i style=""><font face="細明體">[?] Install <b style="">200-W
</b>load</font></i></i></b></p>
<b><i><i style=""> </i></i></b><p class="MsoNormal"><b><i><i style=""><font face="細明體">[?] Reset <b style="">R88</b>
for <b style="">S=051</b></font></i></i></b></p>
<b><i><i style=""> </i></i></b><p class="MsoNormal"><b><i><i style=""><font face="細明體">[?] Verify
or set <b style="">Z=204</b></font></i></i></b></p>
<b><i><i style=""> </i></i></b><p class="MsoNormal"><b><i><i style=""><font face="細明體">[?] Install <b style="">75-W</b>
load</font></i></i></b></p>
<b><i><i style=""> </i></i></b><p class="MsoNormal"><b><i><i style=""><font face="細明體">[?] Reset <b style="">R89</b>
for <b style="">R=051
</b></font></i></i></b></p>
<b><i><i style=""> </i></i></b><h4><b><i><i style=""><b style=""><font size="5"><font face="細明體">Important Note:</font></font><font face="細明體">
</font>
</b> <font face="細明體">Small single-turn trimpots are touchy to adjust
and tracking settings are somewhat interactive. If specified readings aren急
obtained on the run-through, repeat the sequence a second time (accuracy
counts). When the sequence is complete, turn power off to remove the analyzer
from Test Mode.</font></i></i></b></h4>
<b><i><i style=""> </i></i></b><h4><b><i><i style=""><font face="細明體">Be particularly mindful of the total bits of Vz and Vs. If the sum of
these bits ever exceeds 255 with a resistive load, the analyzer will indicate
reactance.?</font></i></i></b></h4>
<b><i><i style=""> </i></i></b><p class="MsoNormal"><span style="font-size: 16pt;"><b><i><i style=""><font face="細明體">Display
Test and Analog Meter
Calibration </font>
</i></i></b></span></p>
<b><i><i style=""> </i></i></b><h3><b><i><i style=""><font face="細明體">Step 7:</font></i></i></b></h3>
<b><i><i style=""> </i></i></b><p class="MsoNormal"><b><i><i style=""><font face="細明體">This step sequence checks meter calibration and verifies accuracy
of the LCD Display information.</font><b style=""><font face="細明體"> </font>
</b></i></i></b></p>
<b><i><i style=""> </i></i></b><p class="MsoNormal"><b><i><i style=""><font face="細明體">Remove and re-apply power and enter the Real-Imaginary impedance mode <b style="">R-X</b>.
Readings + or - 10% of reading or?+ or - 5 ohms of display, whichever is
larger, are considered within design specifications. Typically digital
readings are almost perfect with proper detector calibration. Analog meter
readings may be outside that range, and as much as 20% off with some load
values.?</font></i></i></b></p>
<b><i><i style=""> </i></i></b><p class="MsoNormal"><b><i><i style=""><font face="細明體">[?] Install <b style="">75-W</b>
load</font></i></i></b></p>
<b><i><i style=""> </i></i></b><p class="MsoNormal"><b><i><i style=""><font face="細明體">[?] Verify
reading of <b style="">R= 75 X=0</b> on LCD Display (?/span>10%)</font></i></i></b></p>
<b><i><i style=""> </i></i></b><p class="MsoNormal"><b><i><i style=""><font face="細明體">[?] Install <b style="">50-W</b>
load</font></i></i></b></p>
<b><i><i style=""> </i></i></b><p class="MsoNormal"><b><i><i style=""><font face="細明體">[?] Verify
reading of <b style="">R=50</b> <b style="">X=0</b> on LCD Display (?/span>10%)</font></i></i></b></p>
<b><i><i style=""> </i></i></b><p class="MsoNormal"><b><i><i style=""><font face="細明體">[?] Set <b style="">R67</b>
for reading of <b style="">50 </b>on the Impedance Meter.</font></i></i></b></p>
<b><i><i style=""> </i></i></b><p class="MsoNormal"><b><i><i style=""><font face="細明體">[?] Verify
reading of <b style="">1.0 </b>SWR Meter (no deflection).</font></i></i></b></p>
<b><i><i style=""> </i></i></b><p class="MsoNormal"><b><i><i style=""><font face="細明體">[?] Install <b style="">Open
</b>load</font></i></i></b></p>
<b><i><i style=""> </i></i></b><p class="MsoNormal"><b><i><i style=""><font face="細明體">[?] Verify
reading above <b style="">400 </b>on<b style=""> </b>Impedance Meter
</font>
</i></i></b></p>
<b><i><i style=""> </i></i></b><p class="MsoNormal"><b><i><i style=""><font face="細明體">[?] Install <b style="">100-W</b>
load</font></i></i></b></p>
<b><i><i style=""> </i></i></b><p class="MsoNormal"><b><i><i style=""><font face="細明體">[?] Verify
reading of <b style="">R=100</b> <b style="">X=0</b> on LCD Display (?/span>10%)</font></i></i></b></p>
<b><i><i style=""> </i></i></b><p class="MsoNormal"><b><i><i style=""><font face="細明體">[?] Verify
reading of <b style="">100 </b>on Impedance meter (approximate).?/span></font></i></i></b></p>
<b><i><i style=""> </i></i></b><p class="MsoNormal"><b><i><i style=""><font face="細明體">[?] Set <b style="">R56</b>
for a reading of <b style="">2</b> (2:1) on the SWR Meter</font></i></i></b></p>
<b><i><i style=""> </i></i></b><p class="MsoNormal"><b><i><i style=""><font face="細明體">[?] Install <b style="">12.5-W</b>
load</font></i></i></b></p>
<b><i><i style=""> </i></i></b><p class="MsoNormal"><b><i><i style=""><font face="細明體">[?] Verify a
reading of <b style="">4:1</b> SWR on LCD display (3.8-4.2 good)?/span></font></i></i></b></p>
<b><i><i style=""> </i></i></b><p class="MsoNormal"><b><i><i style=""><font face="細明體">[?] Verify
reading of <b style="">>3</b> (greater than 3:1)
on SWR Meter</font></i></i></b></p>
<b><i><i style=""> </i></i></b><p class="MsoNormal"><b><i><i style=""><font face="細明體">[?] Install <b style="">200-W</b>
load</font></i></i></b></p>
<b><i><i style=""> </i></i></b><p class="MsoNormal"><b><i><i style=""><font face="細明體">[?] Verify
reading of <b style="">4:1</b> SWR on LCD display (3.8-4.2 good)</font></i></i></b></p>
<b><i><i style=""> </i></i></b><p class="MsoNormal"><b><i><i style=""><font face="細明體">[?] Verify
reading of <b style="">>3</b> (greater than 3:1)
on SWR Meter
</font>
</i></i></b></p>
<b><i><i style=""> </i></i></b><p class="MsoNormal"><b><i><i style=""><font face="細明體">?o:p>
</font>
</i></i></b></p>
<b><i><i style=""> </i></i></b><h3><b><i><i style=""><font face="細明體"><span style="font-size: 16pt;">Capacitance Mode
Check
</span></font></i></i></b></h3>
<b><i><i style=""> </i></i></b><h3><b><i><i style=""><b style=""><font face="細明體">Step
8:?/b></font><font face="細明體">
?/o:p></font></b></i></i></b></h3>
<b><i><i style=""><b style=""> </b></i></i></b><p><b><i><i style=""><b style=""><font face="細明體">If you have a few precision capacitors, you can verify the calibration
between the ranges of 100 and 5000 pF. Read the analyzer manual for details of
capacitor measurement.??</font></b></i></i></b></p>
<b><i><i style=""><b style=""> </b></i></i></b><p class="MsoNormal"><b><i><i style=""><b style=""><font face="細明體">[?] Install
no load</font></b></i></i></b></p>
<b><i><i style=""><b style=""> </b></i></i></b><p class="MsoNormal"><b><i><i style=""><b style=""><font face="細明體">[?] Set Mode to Capacitance
</font>
</b></i></i></b></p>
<b><i><i style=""><b style=""> </b></i></i></b><p class="MsoNormal"><b><i><i style=""><b style=""><font face="細明體">[?] Set VFO
to 70 MHz</font></b></i></i></b></p>
<b><i><i style=""><b style=""> </b></i></i></b><p class="MsoNormal"><b><i><i style=""><b style=""><font face="細明體">[?] Verify 4-6
pF reading on LCD Display</font></b></i></i></b></p>
<b><i><i style=""><b style=""> </b></i></i></b><p class="MsoNormal"><b><i><i style=""><b style=""><font face="細明體">?o:p></font><span style="font-size: 16pt;"><font face="細明體">Frequency Counter
Check </font>
</span>
</b></i></i></b></p>
<b><i><i style=""><b style=""> </b></i></i></b><h3><b><i><i style=""><b style=""><font face="細明體">Step 9:</font></b></i></i></b></h3>
<b><i><i style=""><b style=""><font face="細明體"> </font></b></i></i></b><p class="MsoNormal"><b><i><i style=""><b style=""><font face="細明體">These steps verify accuracy of the counter. Note that the
counter旧 clock isn急 user-accessible, so no adjustments will be made. To
conduct this test, use a general-coverage receiver in AM mode.</font></b></i></i></b></p>
<b><i><i style=""><b style=""><font face="細明體"> </font></b></i></i></b><p class="MsoNormal"><b><i><i style=""><b style=""><font face="細明體">?o:p>
</font></b></i></i></b></p>
<b><i><i style=""><b style=""><font face="細明體"> </font></b></i></i></b><p class="MsoNormal"><b><i><i style=""><b style=""><font face="細明體">[?] Tune in WWV
on 5.0,10.0,15.0, or 20.0 MHz (frequency with best reception).</font></b></i></i></b></p>
<b><i><i style=""><b style=""><font face="細明體"> </font></b></i></i></b><p class="MsoNormal"><b><i><i style=""><b style=""><font face="細明體">[?] Install
a short clip lead or wire in the analyzer旧 Antenna
jack.</font></b></i></i></b></p>
<b><i><i style=""><b style=""><font face="細明體"> </font></b></i></i></b><p class="MsoNormal"><b><i><i style=""><b style=""><font face="細明體">[?] Turn on
the analyzer and zero-beat the WWV
signal as closely as possible.</font></b></i></i></b></p>
<b><i><i style=""><b style=""><font face="細明體"> </font></b></i></i></b><p class="MsoNormal"><b><i><i style=""><b style=""><font face="細明體">[?] Compare LCD
Display reading to the WWV frequency being used.</font></b></i></i></b></p>
<b><i><i style=""><b style=""><font face="細明體"> </font></b></i></i></b><p class="MsoNormal"><b><i><i style=""><b style=""><font face="細明體">[?] Verify
agreement is within ?/span>5
kHz.
</font></b></i></i></b></p>
<b><i><i style=""><b style=""><font face="細明體"> </font></b></i></i></b><h3><span style="font-size: 16pt;"><b><i><i style=""><b style=""><font face="細明體">Advanced Modes
Check </font><span style="font-family: Symbol;">
</span>
</b></i></i></b></span></h3>
<b><i><i style=""><b style=""> </b></i></i></b><h3><b><i><i style=""><b style=""><font face="細明體">Step 10:?o:p>
</font></b></i></i></b></h3>
<b><i><i style=""><b style=""><font face="細明體"> </font></b></i></i></b><p class="MsoNormal"><b><i><i style=""><b style=""><font face="細明體">This sequence verifies operation of the analyzer旧
advanced features. To enter Advanced
Mode menu:</font></b></i></i></b></p>
<b><i><i style=""><b style=""><font face="細明體"> </font></b></i></i></b><p class="MsoNormal"><b><i><i style=""><b style=""><font face="細明體">[?] Turn
unit off.</font></b></i></i></b></p>
<b><i><i style=""><b style=""><font face="細明體"> </font></b></i></i></b><p class="MsoNormal"><b><i><i style=""><b style=""><font face="細明體">[?] Hold
down the MODE and GATE switches while turning power on.</font></b></i></i></b></p>
<b><i><i style=""><b style=""><font face="細明體"> </font></b></i></i></b><p class="MsoNormal"><b><i><i style=""><b style=""><font face="細明體">[?] Verify
?i style="">Advanced?/i> appears on the LCD
Display.</font></b></i></i></b></p>
<b><i><i style=""><b style=""><font face="細明體"> </font></b></i></i></b><p class="MsoNormal"><b><i><i style=""><b style=""><font face="細明體">[?] Install Open
load
</font></b></i></i></b></p>
<b><i><i style=""><b style=""><font face="細明體"> </font></b></i></i></b><p class="MsoNormal"><b><i><i style=""><b style=""><font face="細明體">[?] Tune VFO
to >170 MHz (top end of coverage
range)</font></b></i></i></b></p>
<b><i><i style=""><b style=""><font face="細明體"> </font></b></i></i></b><p class="MsoNormal"><b><i><i style=""><b style=""><font face="細明體">[?] Verify Z
= <650 W
with (about) 90?/span>
phase shift</font></b></i></i></b></p>
<b><i><i style=""><b style=""><font face="細明體"> </font></b></i></i></b><p class="MsoNormal"><b><i><i style=""><b style=""><font face="細明體">[?] Install
RG-8 open stub</font></b></i></i></b></p>
<b><i><i style=""><b style=""><font face="細明體"> </font></b></i></i></b><p class="MsoNormal"><b><i><i style=""><b style=""><font face="細明體">[?] Tune VFO
for minimum Z reading (around 10
MHz)</font></b></i></i></b></p>
<b><i><i style=""><b style=""><font face="細明體"> </font></b></i></i></b><p class="MsoNormal"><b><i><i style=""><b style=""><font face="細明體">[?] Verify Z-min
= 0 to 2 W</font></b></i></i></b></p>
<b><i><i style=""><b style=""><font face="細明體"> </font></b></i></i></b><p class="MsoNormal"><b><i><i style=""><b style=""><font face="細明體">[?] Install 50-W
load</font></b></i></i></b></p>
<b><i><i style=""><b style=""><font face="細明體"> </font></b></i></i></b><p class="MsoNormal"><b><i><i style=""><b style=""><font face="細明體">[?] Set VFO
to 1.8 MHz ?/span></font></b></i></i></b></p>
<b><i><i style=""><b style=""><font face="細明體"> </font></b></i></i></b><p class="MsoNormal"><b><i><i style=""><b style=""><font face="細明體">[?] Verify Z
= 50 W,
q
= 0?/span>,
and SWR = 1 (?/span>10%)</font></b></i></i></b></p>
<b><i><i style=""><b style=""><font face="細明體"> </font></b></i></i></b><p class="MsoNormal"><b><i><i style=""><b style=""><font face="細明體">[?] Enter RL Mode (return loss)</font></b></i></i></b></p>
<b><i><i style=""><b style=""><font face="細明體"> </font></b></i></i></b><p class="MsoNormal"><b><i><i style=""><b style=""><font face="細明體">[?] Verify RL
= >42 dB, r
= 0, SWR = 1
</font></b></i></i></b></p>
<b><i><i style=""><b style=""><font face="細明體"> </font></b></i></i></b><p class="MsoNormal"><b><i><i style=""><b style=""><font face="細明體">[?] Enter Match
Efficiency Mode (skipping DTF Mode) </font>
</b></i></i></b></p>
<b><i><i style=""><b style=""> <span style="font-family: Symbol;">
<p class="MsoNormal"><font face="細明體">[?] Verify ME
@
100%?(approximate)</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[?] Press
and hold MODE and GATE buttons to restore Main Modes</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[?] Remove
load and verify Z = >650 on LCD
Display
</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">Conclusion:
</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">Step 11:
</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[?]
Reinstall battery tray</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[?] Confirm
charger jumper is set for type of batteries used (disable for alkaline).</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[?]
Reinstall cover</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">糍his completes calibration.
</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">?o:p>
</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">?o:p>
</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">?o:p>
</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">?o:p>
</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">?o:p>
</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">?o:p>
</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">?o:p>
</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">?o:p>
</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">?o:p>
</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">?o:p>
</font></p>
<font face="細明體"> </font><h3><font face="細明體">MFJ-259B Calibration Checklist</font></h3>
<font face="細明體"> </font><p class="MsoNormal" style="text-align: center;" align="center"><font face="細明體">Make a Xerox
copy and check each box as you proceed down the calibration list.</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">?/span></font></p>
<font face="細明體"> </font><h5><font face="細明體">Physical Condition</font></h5>
<span style="font-size: 12pt;"><font face="細明體"><br style="page-break-before: auto;" clear="all">
</font></span>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[?]
Hardware, batteries okay</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">?o:p>
</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">Harmonic Check </font>
</p>
<p class="MsoNormal"><font face="細明體">[?]
Suppression -35 dBc or better</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">?o:p>
</font></p>
<font face="細明體"> </font><h5><font face="細明體">Overlapping</font></h5>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[?] All
bands have sufficient overlap</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">?o:p>
</font></p>
<font face="細明體"> </font><h5><font face="細明體">Binary Cal: 10 MHz</font></h5>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[? ] <u>Open</u></font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[?] R72 for
Z=255</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[?] <u>Short</u></font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[?] R73 for
S=255</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[?] <u>12.5-W</u></font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[?] R90 for
Z=051</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[?] R53 for
R=153</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[?] <u>200-W</u></font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[?] R88 for
S=051</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[?] R72 for
Z=204</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[?] <u>75-W</u>
</font>
</p>
<p class="MsoNormal"><font face="細明體">[?] R89 for
R=051</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[?] <u>12.5-W</u></font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[?] R90 for
Z=051</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[?] R73 for
S=204</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[?] R53 for
R=153</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[?] <u>200-W</u></font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[?] R88 for
S=051</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[?] Verify
Z=204</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[?] <u>75-W</u></font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[?] R89 for
R=051</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">?o:p>
</font></p>
<font face="細明體"> </font><h5><font face="細明體">Analog Cal: 10 MHz, values ?/span>10%</font></h5>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[?] <u>75-W</u></font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[?] Verify
R= 75 X=0</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[?] <u>50-W</u></font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[?] Verify
R=50 X=0</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[?] Set R67
for 50 on Imp Meter.</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[?] Verify
1.0 on SWR Meter</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[?] <u>Open
</u></font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[?] Verify
>400 on Imp Meter</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[?] <u>100-W</u></font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[?] Verify R=100 X=0</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[?] Verify
100 on Imp Meter?/span></font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[?] R56 for
2 (2:1) on SWR Meter</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[?] <u>12.5-W</u></font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[?] Verify
4:1 on LCD (3.8-4.2)?/span></font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[?] Verify
>3 on SWR Meter</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[?] <u>200-W</u></font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[?] Verify
4:1 on LCD (3.8-4.2)</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[?] Verify
>3 on SWR Meter
</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">?o:p>
</font></p>
<font face="細明體"> </font><h5><font face="細明體">Capacitance Mode Check</font></h5>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[?] <u>Open</u></font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[?] Set VFO
to 70 MHz</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[?] Set Mode
to Capacitance
</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[?] Verify C@4-pF</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">?o:p>
</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">Counter Check
</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[?] Counter
Okay</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">?o:p>
</font></p>
<font face="細明體"> </font><h4><span style="font-size: 12pt; font-style: normal;">
<font face="細明體">Advanced Modes </font>
</span></h4>
<p class="MsoNormal"><font face="細明體">[?] Tune to
170 MHz</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[?] <u>Open</u></font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[?] Verify
<650, Phase @
90?/span></font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[?] <u>3? RG-58</u></font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[?] Tune for
Z-min (@150
MHz)</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[?] Verify
Z= 0-2 W</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[?] <u>50-W</u></font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[?] Tune to
1.8 MHz ?/span></font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">?o:p>
</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[?] Verify
Z=50 W,
q=0?/span>,
SWR=1</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[?] Advance
to Return Loss</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[?] Verify
RL=>42dB, r=0,
SWR=1
</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[?] Advance
to Match Efficiency
</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[?] Verify
ME @
100%</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[?] Restore
Main Modes</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[?] <u>Open</u></font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[?] Verify
Z=>650
</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">?o:p>
</font></p>
<font face="細明體"> </font><h5><font face="細明體">End of Procedure</font></h5>
<font face="細明體"> </font><p class="MsoNormal"><span style="font-size: 10pt;"><font face="細明體">?o:p>
? </font></span></p>
<font face="細明體"> </font><p>
<span style="font-size: 12pt;"><font face="細明體"><br style="page-break-before: auto;" clear="all">
</font></span>
<font face="細明體"> </font></p>
<div class="Section3">
<font face="細明體"> </font><h3><font face="細明體">Pictorial Diagram of Analyzer Board</font></h3>
<font face="細明體"> </font><p class="MsoNormal" style="text-align: center;" align="center"><font face="細明體">Locations for
trimpots and inductors</font></p>
<p class="MsoNormal">
<table id="table2" align="left" cellpadding="0" cellspacing="0">
<tbody><tr>
<td height="0" width="100"><br></td>
</tr>
<tr>
<td><br></td>
<td>
<font face="細明體">
<img src="http://www.rimtai.com.tw/chtr/Products/MFJ/Products/MFJ-ANALYZER/images/calibr6.gif" height="390" width="319"></font></td>
</tr>
</tbody></table>
</p></div>
<p class="MsoNormal">
<font face="細明體">
<br style="" clear="all">
?o:p>
</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">?o:p>
</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">?o:p>
</font></p>
<font face="細明體"> </font><h3><font face="細明體">?o:p>
</font>
</h3>
</span><font face="細明體">
<br style="" clear="all">
</font>
</b></i></i></b><h3><b><i><i style=""><b style=""><font face="細明體">Loads Using Standard-Value Resistors</font></b></i></i></b></h3>
<b><i><i style=""><b style=""> </b></i></i></b><p class="MsoNormal"><b><i><i style=""><b style=""><font face="細明體">?o:p>
</font>
</b></i></i></b></p>
<b><i><i style=""><b style=""> <span style="font-family: Symbol;">
<p class="MsoNormal"> <table id="table3" align="left" cellpadding="0" cellspacing="0">
<tbody><tr>
<td height="0" width="195"><br></td>
</tr>
<tr>
<td><br></td>
<td>
<font face="細明體">
<img src="http://www.rimtai.com.tw/chtr/Products/MFJ/Products/MFJ-ANALYZER/images/calibr7.gif" height="85" width="157"></font></td>
</tr>
</tbody></table>
<span style="font-family: Symbol;">
</span></p><p><font face="細明體">?/p>
</font></p><p><font face="細明體">?/p>
</font></p><p><font face="細明體">?/p>
</font></p><p><font face="細明體">?/p>
</font></p><ul><font face="細明體"> <li>
Install resistors all the way down in the connector, the goal is zero
lead length</li>
</font></ul>
<font face="細明體"> </font><p><font face="細明體">.</font></p>
<font face="細明體"> </font><ul><font face="細明體"> <li>Use precision 1% carbon or metal film 1/8th-1/4 watt resistors</li>
</font></ul>
<font face="細明體"> </font><p class="MsoNormal" style="margin-left: 1in; text-indent: 0.5in;"><font face="細明體">?o:p>
? </font></p>
<font face="細明體"> </font><p class="MsoNormal" style="margin-left: 1in; text-indent: 0.5in;"><font face="細明體">12.5W
= (4) 50-ohm or 15W
and 82W
in parallel</font></p>
<p class="MsoNormal"><font face="細明體">??????????????????50W
= 49.9-ohm?or 100W
and 100W
in parallel</font></p>
</span>
</b></i></i></b><p class="MsoNormal"><b><i><i style=""><b style=""><font face="細明體">??????????????????75W
= 75-ohm or 150W
and 150W
in parallel</font></b></i></i></b></p>
<p class="MsoNormal"><b><i><i style=""><b style=""><font face="細明體">??????????????????100W
= 100W</font></b></i></i></b></p>
<p class="MsoNormal"><b><i><i style=""><b style=""><font face="細明體">??????????????????200W
= 200-ohm or 100W
+ 100W
in series</font></b></i></i></b></p>
<b><i><i style=""><b style=""><font face="細明體"> </font></b></i></i></b><p class="MsoNormal"><b><i><i style=""><b style=""><font face="細明體">?/span><span style="font-size: 12pt;">Important Note: These simple HF loads will not be accurate for SWR
checks above
<i style="font-size: 12pt;">3</i></span></font><span style="font-family: Symbol;"><span style="font-size: 12pt;"><font face="細明體">0 MHz. Only precision terminations should be used in the VHF
region<i style="font-size: 12pt;">,
and even then there can be some errors</i>.
<i style="font-size: 12pt;">
The MFJ-259B does not correct for connector impedance bumps or the electrical
length between an external load and the bridge inside the unit.</i></font></span><span style="font-size: 12pt; font-family: 細明體;">
</span></span></b></i></i></b></p>
<b><i><i style=""><b style=""> </b></i></i></b><table id="table4" border="0" cellpadding="0" cellspacing="0" width="100%">
<tbody><tr>
<td>
<p align="center"><font face="細明體"><font size="7"><b><i>Welcome to
W8JI.com!</i></b></font><br>
[ <a target="" href="http://www.w8ji.com/">Home</a> ]</font></p>
<font face="細明體"> </font><p align="center"><font face="細明體"> </font></p></td>
</tr>
</tbody></table>
<b><i><i style=""><b style=""> </b></i></i></b>
<p align="left"><font face="細明體">©2003-2004 W8JI</font></p>
<font face="細明體"> </font><p align="left"><font face="細明體">Revised 8/24/03</font></p>
<font face="細明體"> </font><p align="left"><font face="細明體">Revised May18 2005 R84 named in error R89 in
harmonic adjustment</font></p>
<font face="細明體"> </font><p align="left"><font face="細明體"><font color="#ff0000" size="5">Warning!</font></font></p>
<font face="細明體"> </font><p align="left"><font face="細明體"><font color="#ff0000" size="5">MFJ manuals were
re-written and distance-to-fault measurement procedure errors were
introduced. I think this occurred sometime around 2002. If your
manual tells you to tune to the <i><b><u>next band up or down</u></b></i>
when measuring any length process (stubs, DTF, etc.) it is
absolutely incorrect. The correct procedure is to tune for lowest Z
on the meter and lowest X on the digital display, set the reading as
"1", and then locate the very next dip UP or DOWN in frequency and
store it in "2". You can use up or down, it just has to be the very
next dip where meter Z is lowest and X on the digital display is as
low as possible. I'm not sure what other errors may have been
introduced in the manual rewrite. </font></font></p>
<font face="細明體"> <table id="table6" bgcolor="#ffffcc" border="1" width="100%">
<tbody><tr>
<td>
<p align="left">History:</p>
<p align="left"><i><b>I worked with another contract
engineer (my friend JB) in designing the MFJ 259 and 269. No
one else outside of MFJ was involved, and certainly no one
named Ted Hart. </b></i></p>
<p align="left"><i><b>This information is here because it is
the <u><font size="5">correct</font></u> way to calibrate
the MFJ-259B analyzer. This work is all donated. K1BQT took
an instruction set supplied by MFJ and re-wrote it. I
modified, expanded and edited that work. This page is the
result.</b></i></p>
<p align="left"><i><b>It is best that no one copy this, and
start handing it out in mass. The only reason for this
request is there must be a point of control of information,
so it can be corrected or expanded as errors or omissions
are found.</b></i></p>
<p align="left"><i><b>I am not aware of any other source
that gives correct calibration procedures. It is important
that the 259 be calibrated by these steps, even if they
sound complex. If you don't do it right, don't do it.
Without following these steps, many special functions may
not work correctly even if the unit tests properly on
calibration loads!</b></i></p></td>
</tr>
</tbody></table>
</font><h3 align="left"><font face="細明體">How This Type of Device Works</font></h3>
<font face="細明體"> </font><p align="left"><font face="細明體">This type of analyzer contains an RF oscillator, a
linear amplifier to increase power, and an internal resistor bridge
in a conventional Whetstone bridge configuration.</font></p>
<font face="細明體"> </font><p align="left">
<font face="細明體"> <img src="http://www.rimtai.com.tw/chtr/Products/MFJ/Products/MFJ-ANALYZER/images/MFJ259_block.jpg" border="0" height="517" width="850"></font></p>
<font face="細明體"> </font><p align="left"><font face="細明體"> </font></p>
<font face="細明體"> </font><p align="left"><font face="細明體">Since it is designed to be inexpensive, there are a
few shortfalls with this system. </font></p>
<font face="細明體"> </font><p align="left"><font face="細明體">The bridge is dc-coupled from an internal resistor
bridge to the antenna port. The bridge detectors are NOT frequency
selective, and respond to anything from minor dc offsets through
microwave signals. This causes a potential problem if there is <b>
<i>any</i></b> voltage appearing across the antenna port, from dc
through microwave. (This is also true for competing analyzers from
other manufacturers.) There are multiple reasons why, at the time of
design, these units were dc coupled with broadband detectors.
Hopefully someday a higher cost-design with selective detectors will
become available, but for right now this is all that is available
for amateur use from any manufacturer.</font></p>
<font face="細明體"> </font><p align="left"><font face="細明體">The second shortfall is the internal amplifier must
be linear and have very low total harmonic content. Total harmonic
power, at the lowest load impedance, must be down at least 25dB and
preferably 35dB. This is true for <b><i>ANY</i></b> antenna
analyzer, since you do not want the analyzer to measure the load at
two frequencies! </font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體"><b><i><font size="4"><font color="#ff0000">
Because the detector is broadband and because it is dc coupled to
the antenna, any external voltage across the input port causes
measurement errors.</font> </font></i></b>It is the <b>accumulated
voltage of multiple sources </b>that is most important, not the
strength of any individual signal. Because of that, large antennas
should be tested at times when propagated signals in the range of
the antenna's response are at minimum strength. </font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">A definite RFI improvement occurs with a
bandpass filter, but multiple-section bandpass filters cause
impedance measurement problems. Multiple-section filters behave like
transmission lines of random line impedances, loss, and lengths as
frequency is varied. The best solution is to use a single-stage
bandpass filter and dc isolation on large arrays or with long
feedlines. I often use a good 1:1 isolation transformer for
measurements, and often find a parallel L/C filter (like the MFJ-731
Filter) useful. </font></p>
<font face="細明體"> </font><h3><font face="細明體"> Most Likely Failures</font></h3>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">Other than manufacturing errors, the <b>
detector diodes clearly stand out as the most common problem. They
are the most easily damaged devices in the analyzer.</b> If you have
a sudden problem, it is most likely a defective detector diode.
Diode damage almost always comes from accidentally applying voltage
on the antenna port. </font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">Why are the diodes so sensitive? In order for
the detectors to be accurate within a fraction of a percent (one
bit), detector diodes must have very low capacitance and a very low
threshold voltage. This means the diodes, through necessity, must be
low-power zero-bias Schottky microwave detector diodes. The same
characteristics that make them accurate and linear cause the diodes
to be especially sensitive to damage from small voltage spikes. <b>
<i>ALWAYS discharge large antennas before connecting them to the
analyzer! Never apply external voltages greater than 3 volts to the
antenna port!</i></b></font></p>
<font face="細明體"> </font><h3><font face="細明體">Technical Support Error</font></h3>
<font face="細明體"> </font><p><font face="細明體">From time to time MFJ gives incorrect advice on the 259B and
other analyzers. One bad piece of advice that has come to my
attention concerns measuring stubs. Someone in MFJ support has been
telling customers that the older or original manual is wrong and to
tune for a dip on the next range, but unfortunately they are wrong.
The older manual is actually correct! Whatever anyone might tell you
to do when calling MFJ technical support, *this* is how it has to be
done: </font></p>
<font face="細明體"> </font><ul><font face="細明體"> <li>You MUST tune for lowest X and minimum impedance.
</li>
<li>Store that frequency point.
</li>
<li>Move to the VERY NEXT minimum X and lowest impedance either
up or down in frequency.
</li>
<li>When you store that point, the correct length will appear.
This assumes you set the velocity at 1.00 to obtain electrical
length </li>
</font></ul>
<font face="細明體"> </font><p><font face="細明體"><b><i>Note:</i></b> Measurements of stubs and cable lengths will
occur if the harmonic null is not adjusted correctly in the 259 or
269! </font></p>
<font face="細明體"> </font><h2><font face="細明體">How This Unit Works</font></h2>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">This is a rough outline of how this unit works:</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">The MFJ-259B, and other digitized MFJ antenna
analyzers, compare three major voltages in a 50-ohm bridge circuit.
They are:</font></p>
<font face="細明體"> </font><h4><font face="細明體">Vz= Voltage across the load. This voltage is called Z in the
alignment display menu</font></h4>
<font face="細明體"> </font><h4><font face="細明體">Vr= Voltage indicating bridge balance. This voltage is called R
in the alignment display menu</font></h4>
<font face="細明體"> </font><h4><font face="細明體">Vs= Voltage across a 50-ohm resistor between the RF source and
the load. This voltage is called S in the alignment display menu </font></h4>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體"> All voltages are converted through an
eight-bit A-D converter to a 256-bit digitized output with a
test-display range of 0-255 bits. By knowing the ratio of these
voltages, as compared to the regulated RF source voltage, many
different load parameters can be calculated. An antenna analyzer
could calculate everything (except sign of reactance) from measuring
only Vs and Vz, but at certain impedances any small error in either
Vs and Vz becomes critical. This is especially true when voltage is
digitized into a 256-bit format (~0.4% steps). At certain
impedances, an almost immeasurable voltage change will cause a
sudden large jump in the measured impedance parameters.</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">To reduce display impedance jumps, SWR is
weighed into the calculation of reactance and resistance at low SWR
values. (An SWR bridge is most accurate when the load is closest to
50 ohms, which is a primary measurement area where impedance
measurements through Vz and Vs become critical.) By factoring in a
direct SWR measurement from an internal bridge, the analyzer can
check and "correct" any small level errors in Vs or Vz. This reduces
the impedance jump that would occur with a one-bit jump in voltage.
This also why bits must be calibrated for near-perfect accuracy. a
one-bit error can cause a resistive load to appear reactive (the
total of Vs and Vz must always be 255 bits or less for a load to be
considered resistive).</font></p>
<font face="細明體"> </font><h2 align="left"><font face="細明體">Calibrating the MFJ-259B Antenna Analyzer</font></h2>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">This calibration procedure is the correct
procedure for later MFJ-259B's. Disregard any other information.
Since MFJ-259B firmware has several versions under the same model
number, you may find some final performance verification steps not
valid. These steps will involve parameters that do not appear on the
display.</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">Be sure you have printed a copy of the board
layout showing adjustment points, have read all this, and have
suitable loads before proceeding. </font></p>
<font face="細明體"> </font><h2><font face="細明體">Adjustments</font></h2>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">This unit has tracking and gain adjustments for
Vz, Vs, and Vr. Tracking is set at low voltages (low bits). Gain is
set at high voltages or bits. Together they make the detector
voltage output closely track the actual RF voltage. </font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">This unit also has meter calibration
adjustments. The analog meters almost certainly suffer from some
scale linearity problems, they will be somewhat less accurate than
the digital display. These adjustments only affect analog meter
readings. The meter adjustments do not affect the display.</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">Quiescent current (bias) in the RF amplifier
section is adjustable. This adjustment directly affects output
signal harmonic content. Harmonics are worse with low supply
voltages, and with low impedance loads. <b><i>Be sure you check the
harmonics as outlined below, with a 1/4 wl open-circuit stub!!</i></b></font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">Excessive harmonics can cause severe errors in
measurement of frequency-selective loads, even when dummy-load SWR
tests appear perfect. Loads most sensitive to harmonic-induced
errors include, but are not limited to, antenna tuners, tank
circuits, very short resonant antennas, and distance to fault and
stub length measurements. If you notice something "funny" going on
with a stub measurement, it may be a fault of incorrect bias. </font></p>
<font face="細明體"> </font><h4><font face="細明體"><font size="4">Warning: </font>Never calibrate around a sudden
"problem" that appears. If a detector suddenly shifts voltage, the
problem is almost certainly a defective detector diode. If the meter
is recalibrated with a defective (leaky) diode, the meter will
probably NOT track correctly with frequency.</font></h4>
<font face="細明體"> </font><h1 align="center"><font face="細明體">Alignment </font></h1>
<font face="細明體"> </font><p class="MsoNormal"><b><font face="細明體">Tools and Equipment:
</font><span style="font-family: Symbol;">
</span></b></p>
<p class="MsoNormal"><font face="細明體">[ ] #2 and #1 Phillips-head
screwdrivers</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Digital meter or accurate analog meter for
checking supply voltage</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Small set of non-metallic alignment wands
for coils, or small jeweler's screwdrivers for controls </font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Power supply, regulated to 12-volts + - 5%</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] General-coverage receiver with level meter
or Spectrum Analyzer (these are optional with additional work and
use of a stub) </font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] ~10 MHz 1/4wl open-stub, for example 15'
good-quality solid-dielectric RG-8, UHF connector at on end, open on
other (not needed with analyzer or receiver)</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] 2.2-ohm 1/4 or 1/2 watt film resistor (not
needed with stub) </font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Accurate load set to include:</font></p>
<font face="細明體"> </font><p class="MsoNormal" style="text-indent: -0.25in; margin-left: 0.75in;">
<font face="細明體"> A.</font><span style="font-family: Symbol;"><span style="font-style: normal; font-variant: normal; font-weight: normal; font-size: 7pt; font-family: 細明體;">
</span><font face="細明體">Short</font></span></p>
<font face="細明體"> </font><p class="MsoNormal" style="text-indent: -0.25in; margin-left: 0.75in;">
<font face="細明體"> B.</font><span style="font-style: normal; font-variant: normal; font-weight: normal; font-size: 7pt; font-family: 細明體;">
</span><font face="細明體">12.5-</font><span style="font-family: 細明體;">W</span><font face="細明體"><b>
</b>load</font></p>
<font face="細明體"> </font><p class="MsoNormal" style="text-indent: -0.25in; margin-left: 0.75in;">
<font face="細明體"> C.</font><span style="font-style: normal; font-variant: normal; font-weight: normal; font-size: 7pt; font-family: 細明體;">
</span><font face="細明體">50-</font><span style="font-family: 細明體;">W</span><font face="細明體">
load</font></p>
<font face="細明體"> </font><p class="MsoNormal" style="text-indent: -0.25in; margin-left: 0.75in;">
<font face="細明體"> D.</font><span style="font-style: normal; font-variant: normal; font-weight: normal; font-size: 7pt; font-family: 細明體;">
</span><font face="細明體">75-</font><span style="font-family: 細明體;">W</span><font face="細明體">
load</font></p>
<font face="細明體"> </font><p class="MsoNormal" style="text-indent: -0.25in; margin-left: 0.75in;">
<font face="細明體"> E.</font><span style="font-style: normal; font-variant: normal; font-weight: normal; font-size: 7pt; font-family: 細明體;">
</span><font face="細明體">100-</font><span style="font-family: 細明體;">W</span><font face="細明體">
load</font></p>
<font face="細明體"> </font><p class="MsoNormal" style="text-indent: -0.25in; margin-left: 0.75in;">
<font face="細明體"> F.</font><span style="font-style: normal; font-variant: normal; font-weight: normal; font-size: 7pt; font-family: 細明體;">
</span><font face="細明體">200-</font><span style="font-family: 細明體;">W</span><font face="細明體">
load</font></p>
<font face="細明體"> </font><h4><font face="細明體">Note 1: Loads must be constructed using physically small 1%
carbon-film resistors. </font></h4>
<font face="細明體"> </font><ul><font face="細明體"> <li>
<h4>DO NOT use large resistors. Acceptable results will be
obtained when load resistors are mounted in the very bottom of a
UHF-male connector. </h4>
</li>
<li>
<h4>The ideal load resistors are surface-mount
precision-resistors, but other styles will work. It is
acceptable to parallel multiple resistors to obtain low
resistances, but don't series connect more than two resistors!
</h4>
</li>
<li>
<h4>Never use physically large resistors, such as 1-watt or
larger resistors, unless you are absolutely positive they are
composition-types (very rare). </h4>
</li>
<li>
<h4>Since the loads are used to set the number of bits in
critical calculations, the maximum reactance error will always
be worse than the percentage of resistive load error. <i>A one
bit error in calibration (~ .4%) can cause a purely resistive
load to read reactive.</i> </h4>
</li>
</font></ul>
<font face="細明體"> </font><h4><font face="細明體">Quick-connect loads can be made with surface mount resistors on
a BNC male chassis mount connector with the bayonet removed. This
makes a "quick connect" connector that will slide directly into a
type-N female. In this case, use a good UHF to BNC female adaptor
for the 259 units. With a 269, the load will plug directly in to the
N female. </font></h4>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體"><b>Note 2: The power source should be the
LOWEST expected operating voltage. DO NOT use a standard "wall-wart"
or batteries! You can reduce voltage from a conventional 13.8v
regulated supply by adding a few series diodes. Silicon diodes will
normally drop about 0.6volts or so per diode. Three or four diodes
will reduce place the voltage below 12 volts.</b></font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體"><b>WARNING: </b>The MFJ-1315 AC adapter or
other "wall-warts" should NOT be used to power the unit for most
alignment steps.<b> </b></font></p>
<font face="細明體"> </font><h3><font face="細明體"><b>Step 1</b></font></h3>
<font face="細明體"> </font><p><font face="細明體"><b>Visual Inspection:</b> Before, during, and after calibration,
be mindful of physical condition.<b> </b>Watch for missing or loose
hardware. Do not tug, stress, or repeatedly flex leads, or
carelessly flop or toss things about. Keep your bench clean. Follow
these rules the entire time you have the unit apart!</font></p>
<font face="細明體"> </font><h3><font face="細明體">Step 2</font></h3>
<font face="細明體"> </font><p><font face="細明體"><b>Battery Tray Removal: </b>This step provides access to
trim-pots and most inductor adjustments.<b> </b></font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Remove last two batteries at each end of
the tray.</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Remove two screws (right side) and extract
the tray.</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Always position the battery tray to
minimize strain on wires. </font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">Refer to the board layout pictorial for
specific control locations.</font></p>
<font face="細明體"> </font><h3><font face="細明體">Step 3</font></h3>
<font face="細明體"> </font><p><font face="細明體"><b>Band Overlapping: </b>Each band should overlap the next by a
small amount to ensure gap-free coverage from 1.8 MHz to 170 MHz.
While viewing the <i>LCD Frequency Display</i>, wiggle the
bandswitch from side-to-side gently. Watch for any display or meter
dropout. Check each band as follows:</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] <b>114-170 MHz:</b> Oscillator tunes from
below 114.0 MHz to above 170.0 MHz. Check tune for dead spots.</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] <b>70-114 MHz:</b> Oscillator tunes from
below 70.0 MHz to above 114.0 MHz</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] <b>27-70 MHz:</b> Oscillator tunes from
below 27.0 MHz to above 70.0 MHz.</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] <b>10-27 MHz:</b> Oscillator tunes from
below 10.0 MHz to above 27.0 MHz.</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] <b>4-10 MHz:</b> Oscillator tunes from
below 4.0 MHz to above 10.0 MHz.</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] <b>1.8-4 MHz:</b> Oscillator tunes from
below 1.8 MHz to above 4.0 MHz. Check tune for dead spots.</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體"><i>While verifying overlap, at least check the
lowest and highest bands carefully for dead spots. The LCD Display
will indicate 000.000MHz if a dead spot occurs. Dead spots generally
indicate a defective tuning capacitor (<b>TUNE</b>). </i> </font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體"><i>If you find wiggling the switch causes a
dropout, the switch may have dry or dirty contacts. Less likely are
poor solder joints, but check solder joints first. If you must clean
and lubricate the switch, be aware it is a difficult task. The
entire board needs to be lifted from the case front. Dirty
band-switch contacts may be restored with spray tuner cleaners. The
best place to spray the switch is from the front side (shaft side),
right below the nut. You must remove the switch indexing tab
retainer nut and the metal switch retainer (stop) under the nut. Be
sure the stop goes back exactly as removed.</i> </font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">To correct overlap problems, locate and retune
the appropriate VFO coil (see Pictorial for coil locations). Note
that L1-L4 are slug-tuned and require an insulated hex-head tuning
wand. If you use the wrong size wand or a worn wand, it will break a
slug! </font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">Inductors L5 and L6 are located on the
component side of the board and are compression-tuned (press turns
closer together to lower frequency or spread apart to raise
frequency). Make only very small corrections--<i>especially to L5 or
L6</i>--and recheck the band you are adjusting. You should also
check the <i>next lower band</i> after each adjustment to ensure
that the lower band hasn't moved excessively. </font></p>
<font face="細明體"> </font><h4><font face="細明體"><b>Important Warning:</b> VFO coils MUST be aligned from highest
frequency to lowest frequency. The next higher range affects next
lower band the greatest amount. Do not attempt VFO coil adjustment
unless you are experienced working with VHF-LC circuitry or complex
alignment procedures. </font></h4>
<font face="細明體"> </font><h3><font face="細明體">Step 4</font></h3>
<font face="細明體"> </font><p><font face="細明體"><b>Harmonic Suppression/ Bias: </b>Connect the analyzer <i><b>
exactly </b></i>as shown below. </font></p>
<font face="細明體"> </font><ul><font face="細明體"> <li> The impedance of the cable to the measurement device should
match the impedance of the measurement device.
</li>
<li> The "T" must be connected either directly to or placed
within a few inches of the analyzer.
</li>
<li> The power source must be the lowest expected operating
voltage.
</li>
<li> The measurement device must be well-shielded, and not pick
up any substantial signal from the analyzer when the "T" is
disconnected from the analyzer. </li>
</font></ul>
<font face="細明體"> </font><p>
<font face="細明體"> <img src="http://www.rimtai.com.tw/chtr/Products/MFJ/Products/MFJ-ANALYZER/images/Copy_of_MFJ259-1.gif" border="0" height="501" width="871"></font></p>
<font face="細明體"> </font><h3><font face="細明體">Step 5 </font></h3>
<font face="細明體"> <span style="text-decoration: none;"><b>Harmonic Suppression (</b><b style="text-decoration: none;">bias
</b><b>R8</b><b style="text-decoration: none;">4</b><b>):</b> This
adjustment reduces oscillator harmonics. Harmonics will cause
incorrect readings under some load conditions. </span>
</font><p><span style="text-decoration: none;"><font face="細明體"><b>
<font size="4">WARNING:</font></b> </font><b><i><font face="細明體">
Incorrect adjustment of R84 will NOT show when checking with
resistive dummy loads!!! The unit will appear to calibrate
correctly, but will produce errors in stub length,
distance-to-fault, and other frequency selective functions. </font>
</i></b></span></p>
<p><span style="text-decoration: none;"><font face="細明體">When R84 is
set properly, harmonic suppression of –30 to –35dBc should be
possible across most of the analyzer's tuning range. This particular
adjustment must be made at the lowest expected operating voltage.
Proper alignment requires a 12.0-volt regulated supply as a power
source. NEVER use an AC adapter or any supply voltage higher than
12-volts when making this adjustment. A calibrated spectrum analyzer
works best for monitoring harmonic output, but a well-shielded
general-coverage receiver with signal-level meter will also
work. The receiver MUST be "T'd" into the analyzer just as the
spectrum analyzer is, and the Tee and resistor must be located at
the analyzer connector. If you do not have a good-quality receiver
or spectrum analyzer, use the test mode of the analyzer with a
stub. Watch MFJ analyzer test-mode Vz. Test-mode Vz will roughly
indicate total harmonic voltage when the analyzer is set at the
stub's exact resonant frequency. Entering the test mode is described
in Detector Calibration (Step 6). </font></span></p>
<p class="MsoNormal"><font face="細明體">[ ]<b> a.</b> Install either
a 15' RG-8 open stub, or resistor and measurement device, and tune
analyzer to approximately <b>10 MHz</b>. </font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] <b>b.</b> <b>(stub and internal Vz use
only)</b> Observing Vz on the data display (analyzer test mode),
adjust frequency until the <i>lowest </i>fundamental output reading
(or lowest impedance) is obtained. You should clearly see the MFJ
analyzer's fundamental frequency output voltage (Vz) go through a
deep null. </font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] <b>c.</b> Observe the analyzer frequency
reading. This is the approximate resonant frequency of the stub, and
the <u>test frequency</u>. </font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] <b>d.</b> Without changing the analyzer <u>
test frequency</u> setting, observe the second harmonic level. This
harmonic will be at twice the MFJ analyzer frequency counter reading<b>.</b>.</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] <b>e.</b> Adjust <b>R84</b> for <b>lowest
2nd harmonic meter reading </b>on the receiver, lowest Vz test-menu
reading, or lowest harmonic level on the spectrum analyzer. Be SURE
the fundamental frequency level remains nulled in the analyzer. </font></p>
<font face="細明體"> </font><h4><font face="細明體"><font size="4">WARNING:</font> Always repeat steps (b) through
(e) at least one extra time when relying on display Vz. The original
null point of any stub will shift if there is a substantial
reduction in harmonics after R84 is adjusted. The original stub
frequency, as observed at (c), will probably change slightly. It is
NOT necessary to recheck when doing a resistor load test with a
good-quality spectrum analyzer or receiver. With a resistor, exact
test frequency is NOT critical.</font></h4>
<font face="細明體"> </font><h4><font face="細明體"><font size="4">NOTE:</font> If you have a poorly performing
spectrum analyzer or receiver with limited dynamic range, use a stub
with the spectrum analyzer or receiver instead of a 2.2 ohm
resistor. If you have a reasonable quality spectrum analyzer or
receiver (at least 50dB dynamic range) use a 2.2-ohm non-inductive
resistor in lieu of the stub, resistor adjustment is easier and more
accurate.</font></h4>
<font face="細明體"> </font><h3><span style="font-size: 18pt;"><font face="細明體">Detector
Calibration </font> </span></h3>
<h3><font face="細明體">Step 6: </font></h3>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">This critical sequence calibrates A-D
conversion for various load conditions. If you know your unit has
been tampered with, preset trim pots <b>R88</b>, <b>R89</b>, and <b>
R90</b> to their center positions before continuing. If you find any
control bottoms-out in adjustment, you almost certainly have
installed an incorrect load or the analyzer has a defective detector
diode. </font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">To prepare for detector tracking alignment,
place the analyzer in <i>Test Mode. </i>Entering test mode may be
tricky with some units, and it may take practice. To enter <i>Test
Mode</i>: </font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Turn power off. </font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Hold down <b><i>MODE </i></b>and<i><b>
GATE </b> </i>buttons while restoring power.</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] As display comes up, slowly (about 1
second period) rock between pushing the <b>MODE<i> </i></b>and <b>
GATE</b> switches alternately (the best method is to use two
fingers, and rock your hand from side to side between the two
buttons)</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Confirm analyzer has entered test mode (it
may take more than one try).</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Using the <b>MODE</b> button, advance
display to the <b>R-S-Z</b> screen (shown below).</font></p>
<font face="細明體"> </font><h4><font face="細明體"><font size="4">Note:</font> If you go past the R-S-Z screen, you
can still see R-S-Z by pushing and holding the <b>MODE</b> button.</font></h4>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體"> </font></p>
<font face="細明體"> </font><p class="MsoNormal" style="text-align: center;" align="center">
<font face="細明體"> <span style="z-index: 3; left: 215px; width: 3px; position: absolute; top: -2px; height: 42px;">
<img src="http://www.rimtai.com.tw/chtr/Products/MFJ/Products/MFJ-ANALYZER/images/calibr2.gif" height="42" width="3"></span>
<span style="z-index: 2; left: 359px; width: 3px; position: absolute; top: -2px; height: 42px;">
<img src="http://www.rimtai.com.tw/chtr/Products/MFJ/Products/MFJ-ANALYZER/images/calibr3.gif" height="42" width="3"></span>
<span style="z-index: 1; left: 215px; width: 147px; position: absolute; top: -2px; height: 3px;">
<img src="http://www.rimtai.com.tw/chtr/Products/MFJ/Products/MFJ-ANALYZER/images/calibr4.gif" height="3" width="147"></span></font><b><span style="font-family: 細明體;">10.000
MHz </span></b></p>
<h2><font face="細明體">
Rxxx Sx<span style="font-weight: normal;">xx</span> <span style="font-weight: normal;">
</span> Zx<span style="font-weight: normal;">xx</span></font></h2>
<font face="細明體"> </font><p class="MsoNormal">
<font face="細明體"> <span style="z-index: 4; left: 215px; width: 147px; position: absolute; top: -1px; height: 3px;">
<img src="http://www.rimtai.com.tw/chtr/Products/MFJ/Products/MFJ-ANALYZER/images/calibr5.gif" height="3" width="147"></span>
<br clear="all">
[ ] Tune analyzer operating frequency to approximately <b>10.000
MHz</b> </font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Leave antenna connector <b>Open</b></font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Set <b>R72</b> for <b>Z=255</b></font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Install the <b>Short</b></font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Set <b>R73</b> for <b>S=255</b></font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Install </font><b><font face="細明體">12.5-</font><span style="font-family: 細明體;">W</span><font face="細明體">
</font></b><font face="細明體">load</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Set <b>R90</b> for <b>Z=051</b></font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Set <b>R53</b> for <b>R=153</b></font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Install </font><b><font face="細明體">200-</font><span style="font-family: 細明體;">W</span><font face="細明體">
</font></b><font face="細明體">load</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Set <b>R88</b> for <b>S=051</b></font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Set <b>R72</b> for <b>Z=204</b></font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Install </font><b><font face="細明體">75-</font><span style="font-family: 細明體;">W</span><font face="細明體">
</font></b><font face="細明體">load</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Set <b>R89</b> for <b>R=051
</b></font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Install </font><b><font face="細明體">12.5-</font><span style="font-family: 細明體;">W</span><font face="細明體">
</font></b><font face="細明體">load</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Reset <b>R90</b> for <b>Z=051</b></font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Set <b>R73</b> for <b>S=204</b></font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Reset <b>R53</b> for <b>R=153</b></font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Install </font><b><font face="細明體">200-</font><span style="font-family: 細明體;">W</span><font face="細明體">
</font></b><font face="細明體">load</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Reset <b>R88</b> for <b>S=051</b></font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Verify or set <b>Z=204</b></font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Install </font><b><font face="細明體">75-</font><span style="font-family: 細明體;">W</span></b><font face="細明體">
load</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Reset <b>R89</b> for <b>R=051
</b></font></p>
<font face="細明體"> </font><h4><font face="細明體"><b><i><font size="5">Important Note:</font></i> </b>Small
single-turn trimpots are touchy to adjust and tracking settings are
somewhat interactive. If specified readings aren't obtained on the
run-through, repeat the sequence a second time (accuracy counts).
When the sequence is complete, turn power off to remove the analyzer
from <i>Test Mode</i>.</font></h4>
<font face="細明體"> </font><h4><font face="細明體">Be particularly mindful of the total bits of Vz and Vs. If the
sum of these bits ever exceeds 255 with a resistive load, the
analyzer will indicate reactance. </font></h4>
<font face="細明體"> </font><p class="MsoNormal"><span style="font-size: 16pt;">
<font face="細明體">Display Test and Analog Meter Calibration </font>
</span></p>
<h3><font face="細明體">Step 7:</font></h3>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">This step sequence checks meter calibration and
verifies accuracy of the <i>LCD Display</i> information.</font><b><font face="細明體">
</font> </b></p>
<p class="MsoNormal"><font face="細明體">Remove and re-apply power and
enter the <i>Real-Imaginary</i> impedance mode <b>R-X</b>. Readings
+ or - 10% of reading or + or - 5 ohms of display, whichever is
larger, are considered within design specifications. Typically
digital readings are almost perfect with proper detector
calibration. Analog meter readings may be outside that range, and as
much as 20% off with some load values. </font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Install </font><b><font face="細明體">75-</font><span style="font-family: 細明體;">W</span></b><font face="細明體">
load</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Verify reading of <b>R= 75 X=0</b> on <i>
LCD Display</i> (</font><span style="font-family: 細明體;">±</span><font face="細明體">10%)</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Install </font><b><font face="細明體">50-</font><span style="font-family: 細明體;">W</span></b><font face="細明體">
load</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Verify reading of <b>R=50</b> <b>X=0</b>
on<i> LCD Display </i>(</font><span style="font-family: 細明體;">±</span><font face="細明體">10%)</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Set <b>R67</b> for reading of <b>50 </b>on
the <i>Impedance Meter</i>.</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Verify reading of <b>1.0 </b><i>SWR Meter</i>
(no deflection).</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Install <b>Open </b>load</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Verify reading above <b>400 </b>on<b> </b>
<i>Impedance Meter</i> </font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Install </font><b><font face="細明體">100-</font><span style="font-family: 細明體;">W</span></b><font face="細明體">
load</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Verify reading of <b>R=100</b> <b>X=0</b>
on <i>LCD Display </i>(</font><span style="font-family: 細明體;">±</span><font face="細明體">10%)</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Verify reading of <b>100 </b>on <i>
Impedance meter </i>(approximate). </font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Set <b>R56</b> for a reading of <b>2</b>
(2:1) on the <i>SWR Meter</i></font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Install </font><b><font face="細明體">12.5-</font><span style="font-family: 細明體;">W</span></b><font face="細明體">
load</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Verify a reading of <b>4:1</b> SWR on <i>
LCD</i> <i>display</i> (3.8-4.2 good) </font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Verify reading of <b>>3</b> (greater than
3:1) on <i>SWR Meter</i></font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Install </font><b><font face="細明體">200-</font><span style="font-family: 細明體;">W</span></b><font face="細明體">
load</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Verify reading of <b>4:1</b> SWR on <i>LCD
display</i> (3.8-4.2 good)</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Verify reading of <b>>3</b> (greater than
3:1) on <i>SWR Meter </i></font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體"> </font></p>
<font face="細明體"> </font><h3><span style="font-size: 16pt;"><font face="細明體">Capacitance Mode Check
</font></span></h3>
<font face="細明體"> </font><h3><font face="細明體"><b>Step 8: </b></font></h3>
<font face="細明體"> </font><p><font face="細明體">If you have a few precision capacitors, you can verify the
calibration between the ranges of 100 and 5000 pF. Read the analyzer
manual for details of capacitor measurement. </font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Install no load</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Set <i>Mode</i><b> </b>to <i>Capacitance
</i></font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Set VFO to <b>70 MHz</b></font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Verify <b>4-6 pF</b> reading on LCD
Display</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體"> </font><span style="font-size: 16pt;"><font face="細明體">Frequency
Counter Check </font>
</span></p>
<h3><font face="細明體"><b>Step 9:</b></font></h3>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">These steps verify accuracy of the counter.
Note that the counter's clock isn't user-accessible, so no
adjustments will be made. To conduct this test, use a
general-coverage receiver in AM mode.</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體"> </font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Tune in <b>WWV</b> on 5.0,10.0,15.0, or
20.0 MHz (frequency with best reception).</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Install a short clip lead or wire in the
analyzer's <i>Antenna</i> jack.</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Turn on the analyzer and <b>zero-beat the
WWV signal</b> as closely as possible.</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Compare <i>LCD Display</i> reading to the
WWV frequency being used.</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Verify agreement is within </font><b>
<span style="font-family: 細明體;">±</span><font face="細明體">5 kHz.
</font></b></p>
<font face="細明體"> </font><h3><span style="font-size: 16pt;"><font face="細明體">Advanced
Modes Check </font> </span></h3>
<h3><font face="細明體"><b>Step 10: </b></font></h3>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">This sequence verifies operation of the
analyzer's advanced features. To enter <i>Advanced Mode</i> menu:</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Turn unit off.</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Hold down the MODE and GATE switches while
turning power on.</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Verify "<i>Advanced"</i> appears on the <i>
LCD Display</i>.</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Install <b>Open</b> load<b>
</b></font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Tune VFO to <b>>170 MHz</b> (top end of
coverage range)</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Verify <b>Z</b> = </font><b>
<font face="細明體"><650 </font><span style="font-family: 細明體;">W</span></b><font face="細明體">
with (about) </font><b><font face="細明體">90</font><span style="font-family: 細明體;">°</span></b><font face="細明體">
phase shift</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Install RG-8 open stub</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Tune VFO for minimum <b>Z</b> reading
(around 10 MHz)</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Verify <b>Z-min = 0</b> to </font><b>
<font face="細明體">2 </font><span style="font-family: 細明體;">W</span></b></p>
<p class="MsoNormal"><font face="細明體">[ ] Install </font><b>
<font face="細明體">50-</font><span style="font-family: 細明體;">W</span></b><font face="細明體">
load</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Set VFO to <b>1.8 MHz</b> <b> </b></font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Verify </font><b><font face="細明體">Z = 50
</font><span style="font-family: 細明體;">W</span></b><font face="細明體">,
</font><b><span style="font-family: 細明體;">q</span><font face="細明體"> =
0</font><span style="font-family: 細明體;">°</span></b><font face="細明體">,
and <b>SWR = 1</b> (</font><span style="font-family: 細明體;">±</span><font face="細明體">10%)</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Enter <b>RL</b> <i>Mode</i> (return loss)</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Verify <b>RL = </b>><b>42 dB</b>, </font>
<b><span style="font-family: 細明體;">r</span><font face="細明體"> = 0</font></b><font face="細明體">,
<b>SWR = 1 </b></font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Enter <i>Match Efficiency Mode</i>
(skipping <i>DTF Mode</i>)</font><b><font face="細明體"> </font>
</b></p>
<p class="MsoNormal"><font face="細明體">[ ] Verify </font><b>
<font face="細明體">ME </font><span style="font-family: 細明體;">@</span><font face="細明體">
100%</font></b><font face="細明體"> (approximate)</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Press and hold MODE and GATE<b> </b>
buttons<b> </b>to restore <i>Main Modes</i></font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Remove load and verify <b>Z = >650</b> on
<i>LCD Display </i></font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體"><b>Conclusion:
</b></font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體"><b>Step 11:</b> </font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Reinstall battery tray</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Confirm charger jumper is set for type of
batteries used (disable for alkaline).</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Reinstall cover</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體"> This completes calibration. </font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體"> </font></p>
<font face="細明體"> </font><h3><font face="細明體">MFJ-259B Calibration Checklist</font></h3>
<font face="細明體"> </font><p class="MsoNormal" style="text-align: center;" align="center"><font face="細明體">Make
a copy and check each box as you proceed down the calibration list.</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體"> </font></p>
<font face="細明體"> </font><h5><font face="細明體">Physical Condition</font></h5>
<span style="font-size: 12pt; font-family: 細明體;">
<br style="page-break-before: auto;" clear="all">
</span><p class="MsoNormal"><font face="細明體">[ ] Hardware, batteries okay</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體"><i> </i></font></p>
<font face="細明體"> </font><p class="MsoNormal"><b><font face="細明體">Harmonic Check
</font>
</b></p>
<p class="MsoNormal"><font face="細明體">[ ] Suppression -35 dBc or
better</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體"> </font></p>
<font face="細明體"> </font><h5><font face="細明體">Overlapping</font></h5>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] All bands have sufficient overlap</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體"> </font></p>
<font face="細明體"> </font><h5><font face="細明體">Check Digital Calibration at 10 MHz in test mode.</font></h5>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體"><i>[</i> ] <b><u>Open</u></b></font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] R72 for Z=255</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] <b><u>Short</u></b></font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] R73 for S=255</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] </font><b><u><font face="細明體">12.5-</font><span style="font-family: 細明體;">W</span></u></b></p>
<p class="MsoNormal"><font face="細明體">[ ] R90 for Z=051</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] R53 for R=153</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] </font><b><u><font face="細明體">200-</font><span style="font-family: 細明體;">W</span></u></b></p>
<p class="MsoNormal"><font face="細明體">[ ] R88 for S=051</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] R72 for Z=204</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] </font><b><u><font face="細明體">75-</font><span style="font-family: 細明體;">W</span></u><font face="細明體">
</font>
</b></p>
<p class="MsoNormal"><font face="細明體">[ ] R89 for R=051</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] </font><b><u><font face="細明體">12.5-</font><span style="font-family: 細明體;">W</span></u></b></p>
<p class="MsoNormal"><font face="細明體">[ ] R90 for Z=051</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] R73 for S=204</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] R53 for R=153</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] </font><b><u><font face="細明體">200-</font><span style="font-family: 細明體;">W</span></u></b></p>
<p class="MsoNormal"><font face="細明體">[ ] R88 for S=051</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Verify Z=204</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] </font><b><u><font face="細明體">75-</font><span style="font-family: 細明體;">W</span></u></b></p>
<p class="MsoNormal"><font face="細明體">[ ] R89 for R=051</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體"> </font></p>
<font face="細明體"> </font><h5><font face="細明體">Analog Calibration: 10 MHz, values approximate</font></h5>
<font face="細明體"> </font><h5><font face="細明體">[ ] </font><b><u><font face="細明體">75-</font><span style="font-family: 細明體;">W</span></u></b></h5>
<p class="MsoNormal"><font face="細明體">[ ] Verify R= 75 X=0</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] </font><b><u><font face="細明體">50-</font><span style="font-family: 細明體;">W</span></u></b></p>
<p class="MsoNormal"><font face="細明體">[ ] Verify R=50 X=0</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Set R67 for 50<b> </b>on Imp Meter.</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Verify 1.0 on SWR Meter</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] <b><u>Open </u></b></font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Verify >400 on<b> </b>Imp Meter</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] </font><b><u><font face="細明體">100-</font><span style="font-family: 細明體;">W</span></u></b></p>
<p class="MsoNormal"><font face="細明體">[ ] Verify <b>R=100</b> <b>
X=0</b></font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Verify 100<b> </b>on Imp Meter </font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] R56 for 2 (2:1) on SWR Meter</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] </font><b><u><font face="細明體">12.5-</font><span style="font-family: 細明體;">W</span></u></b></p>
<p class="MsoNormal"><font face="細明體">[ ] Verify 4:1 on LCD
(3.8-4.2) </font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Verify >3 on SWR Meter</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] </font><b><u><font face="細明體">200-</font><span style="font-family: 細明體;">W</span></u></b></p>
<p class="MsoNormal"><font face="細明體">[ ] Verify 4:1 on LCD
(3.8-4.2)</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Verify >3 on SWR Meter<i> </i>
</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體"> </font></p>
<font face="細明體"> </font><h5><font face="細明體">Capacitance Mode Check</font></h5>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] <b><u>Open</u></b></font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Set VFO to 70 MHz</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Set Mode to <i>Capacitance </i>
</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Verify C</font><span style="font-family: 細明體;">@</span><font face="細明體">4-pF</font></p>
<p class="MsoNormal"><b></b></p>
<p class="MsoNormal"><font face="細明體"><b>Counter Check
</b></font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Counter Okay</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體"> </font></p>
<font face="細明體"> </font><h4><b><span style="font-size: 12pt; font-style: normal;">
<font face="細明體">Advanced Modes </font> </span></b></h4>
<p class="MsoNormal"><font face="細明體">[ ] Tune to 170 MHz</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] <b><u>Open</u></b></font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Verify <650, Phase </font>
<span style="font-family: 細明體;">@</span><font face="細明體"> 90</font><span style="font-family: 細明體;">°</span></p>
<p class="MsoNormal"><font face="細明體">[ ] <b><u>3' RG-58</u></b></font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Tune for Z-min (</font><span style="font-family: 細明體;">@</span><font face="細明體">150
MHz)</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Verify Z= 0-2 </font>
<span style="font-family: 細明體;">W</span></p>
<p class="MsoNormal"><font face="細明體">[ ] </font><b><u>
<font face="細明體">50-</font><span style="font-family: 細明體;">W</span></u></b></p>
<p class="MsoNormal"><font face="細明體">[ ] Tune to 1.8 MHz <b> </b></font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體"> </font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Verify Z=50 </font>
<span style="font-family: 細明體;">W</span><font face="細明體">, </font>
<span style="font-family: 細明體;">q</span><font face="細明體">=0</font><span style="font-family: 細明體;">°</span><font face="細明體">,
SWR=1</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Advance to Return Loss</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Verify RL=>42dB, </font>
<span style="font-family: 細明體;">r</span><font face="細明體">=0, SWR=1<b>
</b></font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Advance to Match Efficiency<b>
</b></font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Verify ME </font>
<span style="font-family: 細明體;">@</span><font face="細明體"> 100%</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Restore Main Modes</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] <b><u>Open</u></b></font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">[ ] Verify Z=>650<b> </b></font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體"><i> </i></font></p>
<font face="細明體"> </font><h5><font face="細明體">End of Procedure</font></h5>
<font face="細明體"> </font><p class="MsoNormal"><span style="font-size: 10pt;"><font face="細明體">
</font></span></p>
<p><span style="font-size: 12pt; font-family: 細明體;">
<br style="page-break-before: auto;" clear="all">
</span></p>
<div class="Section3">
<h3><font face="細明體">Pictorial Diagram of Analyzer Board</font></h3>
<font face="細明體"> </font><p class="MsoNormal" style="text-align: center;" align="center">
<font face="細明體"> Locations for trimpots and inductors</font></p>
<font face="細明體"> </font><p class="MsoNormal">
<font face="細明體"> </font><span style=""></span></p>
<table id="table7" align="left" cellpadding="0" cellspacing="0">
<tbody><tr>
<td height="0" width="100"> </td>
</tr>
<tr>
<td> </td>
<td><font face="細明體">
<img src="http://www.rimtai.com.tw/chtr/Products/MFJ/Products/MFJ-ANALYZER/images/calibr6.gif" height="390" width="319"></font></td>
</tr>
</tbody></table>
</div>
<p class="MsoNormal"><font face="細明體"><br clear="all">
</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體"> </font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體"> </font></p>
<font face="細明體"> </font><h3><font face="細明體"> </font></h3>
<font face="細明體"> <br clear="all">
</font><h3><font face="細明體">Loads Using Standard-Value Resistors</font></h3>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體"> </font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體">
</font><span style=""></span></p>
<table id="table8" align="left" cellpadding="0" cellspacing="0">
<tbody><tr>
<td height="0" width="195"> </td>
</tr>
<tr>
<td> </td>
<td><font face="細明體">
<img src="http://www.rimtai.com.tw/chtr/Products/MFJ/Products/MFJ-ANALYZER/images/calibr7.gif" height="85" width="157"></font></td>
</tr>
</tbody></table>
<font face="細明體">
<p> </p>
<p> </p>
<p> </p>
<p> </p>
</font><font face="細明體">
</font><ul><font face="細明體"> <li>Install resistors all the way down in the connector, the
goal is zero lead length </li>
</font></ul>
<font face="細明體"> </font><p><font face="細明體">.</font></p>
<font face="細明體"> </font><ul><font face="細明體"> <li>Use precision 1% carbon or metal film 1/8th-1/4 watt
resistors </li>
</font></ul>
<font face="細明體"> </font><p class="MsoNormal" style="margin-left: 1in; text-indent: 0.5in;">
<font face="細明體"> <b> </b></font></p>
<font face="細明體"> </font><p class="MsoNormal" style="margin-left: 1in; text-indent: 0.5in;">
<font face="細明體"> </font><b><font face="細明體">12.5</font><span style="font-family: 細明體;">W</span></b><font face="細明體">
= (4) 50-ohm or a single 15</font><span style="font-family: 細明體;">W</span><font face="細明體">
and 82</font><span style="font-family: 細明體;">W</span><font face="細明體">
1% in parallel</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體"> </font><b>
<font face="細明體">50</font><span style="font-family: 細明體;">W</span></b><font face="細明體">
= 49.9-ohm or 100</font><span style="font-family: 細明體;">W</span><font face="細明體">
and 100</font><span style="font-family: 細明體;">W</span><font face="細明體">
in parallel</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體"> </font><b>
<font face="細明體">75</font><span style="font-family: 細明體;">W</span></b><font face="細明體">
= 75-ohm or 150</font><span style="font-family: 細明體;">W</span><font face="細明體">
and 150</font><span style="font-family: 細明體;">W</span><font face="細明體">
in parallel</font></p>
<font face="細明體"> </font><p class="MsoNormal"><font face="細明體"> </font><b>
<font face="細明體">100</font><span style="font-family: 細明體;">W</span></b><font face="細明體">
= 100</font><span style="font-family: 細明體;">W</span></p>
<p class="MsoNormal"><font face="細明體">
</font><b><font face="細明體">200</font><span style="font-family: 細明體;">W</span></b><font face="細明體">
= 200-ohm or 100</font><span style="font-family: 細明體;">W</span><font face="細明體">
+ 100</font><span style="font-family: 細明體;">W</span><font face="細明體">
in series</font></p>
<font face="細明體"> </font><font face="細明體"> </font><b><i><span style="font-size: 12pt; font-family: 細明體;">Important
Note:</span></i></b><span style="font-size: 12pt;"><i><font face="細明體">
These simple HF loads will not </font></i></span>
<span style="font-size: 12pt; font-family: Arial;">
<i style="font-size: 12pt; font-family: 細明體;">always </i></span>
<span style="font-size: 12pt;"><font face="細明體"><i>be accurate for
SWR checks above </i></font></span>
<span style="font-size: 12pt; font-family: Arial;">
<i style="font-size: 12pt; font-family: 細明體;">3</i><span style="font-size: 12pt;"><font face="細明體"><i>0
MHz. Only precision terminations should be used in the VHF region</i></font></span><i style="font-size: 12pt; font-family: 細明體;">,
and even then there can be some errors</i><span style="font-size: 12pt;"><font face="細明體"><i>.</i>
</font></span><i style="font-size: 12pt; font-family: 細明體;">The
MFJ-259B does not correct for connector impedance bumps or the
electrical length between an external load and the bridge inside the
unit.</i></span><br><br><br>