<div dir="ltr"><p class="MsoNormal"><b><span style="font-size:15pt;font-family:Helvetica,sans-serif;color:rgb(69,66,69)"><img src="cid:ii_15115b425c55b117" alt="Imagem inline 1" width="251" height="195" style="margin-right: 0px;"><img src="cid:ii_15115b487d505e24" alt="Imagem inline 3" width="286" height="191" style="margin-right: 0px;"><br></span></b></p><p class="MsoNormal"><b><span style="font-size:15pt;font-family:Helvetica,sans-serif;color:rgb(69,66,69)"><br></span></b></p><p class="MsoNormal"><b><span style="font-size:15pt;font-family:Helvetica,sans-serif;color:rgb(69,66,69)"><span style="color:rgb(68,68,68)"><a href="http://www.cqdx.ru/ham/new-equipment/elad-spf-08-modular-preselector/" title="Elad SPF-08 Modular Preselector">Elad SPF-08
Modular Preselector </a></span></span></b></p>
<p class="MsoNormal" align="right" style="text-align:right"><br></p>
<p style="text-align:justify"><span style="font-size:10pt;font-family:Helvetica,sans-serif;color:rgb(68,68,68)">Modular Pre-selector for FDM-S1 and FDM-S2 SDRs and other
receivers</span></p>
<p style="text-align:justify"><a href="http://www.cqdx.ru/ham/wp-content/uploads/2015/11/Preselettore_1_600x466.jpg"><span style="font-size:10pt;font-family:Helvetica,sans-serif"></span></a><span style="font-size:10pt;font-family:Helvetica,sans-serif;color:rgb(68,68,68)"></span></p>
<p style="text-align:justify"><span style="font-size:10pt;font-family:Helvetica,sans-serif;color:rgb(68,68,68)">The SPF-08 is a switchable pre-selector filter for receivers,
constructed as a modular system. The device offers the base electronics to
control up to eight filter boards, the filter boards can be freely selected by
the user. Included in the shipment of the base system is the “pass-thru” board.</span></p>
<p style="text-align:justify"><span style="font-size:10pt;font-family:Helvetica,sans-serif;color:rgb(68,68,68)">Pre-selector filters play an important role in achieving
excellent large signal handling caüabilities in a receiver. Especially when
living close to strong medium wave or long wave transmitters, or when using the
receiver with your amateur radio station a good filter is indispensable. With
the use of such filters the first stage of a receiver is relieved of strong out
of band signals whoch could lead to unwanted mixing products in later stages.
For SDRs the dynamic range of the ADC is much better used when unwanted strong
signals are filtered before conversion.</span></p>
<p style="text-align:justify"><span style="font-size:10pt;font-family:Helvetica,sans-serif;color:rgb(68,68,68)">Elad offer ready to use high and low pass filters as well as
band filters for the ham radio bands. Further two empty boards are available to
build your own 3- or 5-pole filters. This allows the demanding radio amateur or
SWL to design filters perfectly matches to his or her requirements.</span></p>
<p style="text-align:justify"><span style="font-size:10pt;font-family:Helvetica,sans-serif;color:rgb(68,68,68)">The SPF-08 Pre-Selector box offers slots for eight filters.
Control is done over the 9-pin SubD socket, which is the same as used on other
Elad devices (FDM-S1, FDM-S2, FDM-DUO-R). This interfaces (which is not an
RS-232 interface) is provided with the frequency information which in turn can
be used to select one of the eight filters. The software of the receiver
provides means to adjust band edges for each filter, where switchijg should
occur. After an initial setup all filter selection is fully automatic.</span></p>
<p style="text-align:justify"><span style="font-size:10pt;font-family:Helvetica,sans-serif;color:rgb(68,68,68)">The case of the SPF-08 is the same as with the FDM-S2 (110 × 90
× 40 mm). Eight LEDs signal which filter is currently selected. The connection
is done with SMA sockets, one SMA adaptor cable is provided so the pre-selector
can be used instantly with a receiver with SMA connectors like the Elad
receivers. Further an interface cable is included, which also handles the power
supply. Use of this filter is in principle also possible for other receiver
brands as well. For this purpose the serial interface protocol is documented,
which is used by the SPF-08 to select a filter. Using an Arduino board to
convert this information from another system would be a nice weekend project.</span></p>
<p style="text-align:justify"><span style="font-size:10pt;font-family:Helvetica,sans-serif;color:rgb(68,68,68)">The SPF-08 pre-selector is not suitable for use with
transceivers, only to be used with receivers.</span></p>
<p style="text-align:justify"><a href="http://www.cqdx.ru/ham/wp-content/uploads/2015/11/spf-08-1.jpg"><span style="font-size:10pt;font-family:Helvetica,sans-serif"></span></a><span style="font-size:10pt;font-family:Helvetica,sans-serif;color:rgb(68,68,68)"></span></p>
<p style="text-align:justify"><u><span style="font-size:10pt;font-family:Helvetica,sans-serif;color:rgb(68,68,68)">The following filter boards are
available:</span></u><span style="font-size:10pt;font-family:Helvetica,sans-serif;color:rgb(68,68,68)"><br>
FLP-500K: Low pass 500 kHz, attenuates everything below 500 kHz. This is the
filter for the (V)LF fan and NDB chaser, but also for the radio amateur active
on 137 or 472 kHz.<br>
FHP-05: High pass 500 kHz, attenuates everything below 500 kHz, useful when you
have nearby long wave transmitters<br>
FHP17: High pass 1700 kHz, attenuates everything below 1700 kHz, useful when
you have nearby long wave or medium wave transmitters<br>
FBP-160: Band pass 160m amateur radio band<br>
FBP-80: Band pass 80m amateur radio band<br>
FBP-40: Band pass 40m amateur radio band<br>
FBP-30: Band pass 30m amateur radio band<br>
FBP-20: Band pass 20m amateur radio band<br>
FBP-17: Band pass 17m amateur radio band<br>
FBP-15: Band pass 15m amateur radio band<br>
FBP-12: Band pass 12m amateur radio band<br>
FPCB-3: Empty board 3-pole DIY filter board<br>
FPCB-5: Empty board 5-pole DIY filter board</span></p>
<p style="text-align:justify"><span style="font-size:10pt;font-family:Helvetica,sans-serif;color:rgb(68,68,68)">Price: 159.00 €<br>
Filters Price: 22 € </span></p></div>