ARLA/CLUSTER: IMPORTANTE resumo de tudo o que necessita de saber sobre Cabos Coaxais a usar na sua estação

[João Costa > CT1FBF]

COAX CABLE DATA
COAX TYPECHARACTERISTIC
IMPEDANCEOUTSIDE
DIAMETERVELOCITY
FACTORATTEN
@ 100 MHZATTEN
@ 1000 MHZCOMMENTS
RG4 50.0 5.74 0.66 Braid shield
RG5/U 52.5 8.4 0.66 1.0 3.8 Braid shield
RG6A/U 75 8.4 0.66 1.0 3.7 Braid shield
RG9/U 51.0 10.7 0.66 0.66 2.4 Braid shield
RG10A/U 50 12.1 0.66 0.66 2.6 Braid shield
RG11A/U 75 10.3 0.66 0.76 2.6 Braid shield
RG12A/U 75 12.1 0.66 0.76 2.6 Braid shield
RG20A/U 50 30.4 0.66 0.22 1.2
RG22 95 10.7 0.66 0.75 1.5 Braid shield
RG23 125 24.0 0.66 0.52 2.0 Braid shield
RG24 125 25.5 0.66 0.52 2.0 Braid shield
RG34 75 16.0 0.66 0.46 1.8 Braid shield
RG58C/U 50 5.0 0.66 1.8 7.6 Braid shield
RG59B/U 75 6.1 0.66 1.2 4.6 Braid shield
RG62A/U 93 6.1 0.84 0.9 2.8 Braid shield
RG63 125 10.3   0.6 2.1 Braid shield
RG79 125 12.1   0.6 2.1 Braid shield
RG108 78 6.0 1.1 3.8 Braid shield
RG111 95 12.1   0.75 2.6 Braid shield
RG114 185 10.3   1.1 3.8 Braid shield
RG119 50 11.8   0.5 1.8 Braid shield
RG120 50 13.3   0.5 1.8 Braid shield
RG122 50 4.1   1.7 5.5 Braid shield
RG213/U 50 10.3 0.66 0.62 2.6 Braid shield, polythene dielectric
RG214/U 50 10.8 0.66 0.76 2.9 Double screened braid, silver plated copper
wire
RG223/U 50 5.5 0.66 1.58 5.4 Double screened braid shield

UR43 / URM43 50 5 0.66 1.3 4.46 Plain copper wire braid
UR57 / URM57 75 10.3 0.66 0.63 2.3 Similar to RG11A/U – plain copper wire
braid.
UR67 / URM67 50 10.3 0.66 0.66 2.52 Similar to RG213/U – plain copper wire
braid
UR74 / URM74 50 22.1 0.66 0.33 1.4 Plain copper wire braid
UR76 / URM76 51 5 0.66 1.7 7.3 Similar to RG58C/U, plain copper wire braid
UR77 75 22.1 0.66 0.33 1.4
UR79 50 21.7 0.96 0.17 0.6
UR90 75 6.1 0.66 1.2 4.1 Similar to RG59B/U
URM91 50 11.0 0.66 Double plain copper wire braid

Data for attenuation figures are typical figures and measured in dB / 10
metres.

Coaxial cables summary

All radio amateurs use coax and often quite a bit of it. Not only is it
used for connecting between units in the shack, but it is also used,
normally as the feeder of choice for taking the transmitter power to the
antenna and conversely the received signals from the antenna to the
receiver.

The performance of the feeder is crucial to the overall performance of the
station. It is easy to lose significant amounts of power between the
station and the antenna. Even a modest run of cable can see losses of 3dB
and more dependent upon the length, frequency and the performance of the
coax.

Coax can be surprisingly expensive, especially when long runs are required.
Understanding the key aspects of coaxial cable as well as hints and tips
for its use can ensure that the optimum choice is made for the coax, it is
used in the best way, and also installed in such a way that it lasts as
long as possible.

Read more about the key aspects of coaxial cable from the basic way in
which it works to aspects like velocity factor, loss, and installation etc
:
https://www.electronics-notes.com/articles/antennas-propagation/rf-feeders-transmission-lines/rf-coaxial-feeder-cable.php

Ian Poole

Editor: Electronics Notes (https://www.electronics-notes.com)
17 Glebe Road
Dorking
RH4 3DS
United Kingdom
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