I still find this interesting... usually the squeal sounds from multiple signals entering the receiver of your radio, isn't because your coax is or isn't cut a certain length. We are talking about the signals that the antenna is picking up and feeding through the coax to your radio. Of course the coaxes job is to transfer RF signals from point A to point B, not act as a filter. Now on the transmit side, getting the voltage and current to cancel each other out with the 180 degree phase, is important. I'm always open to learn something new.
A thread that will never die
Discussion in 'CB Radio Forum' started by Gadfly, Jan 18, 2019.
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My original purpose in posting this thread was to illustrate that, when its all said and done, coax length is more like a placebo. Using the amateur-invented screwdriver that covers 3.5 thru 30 MHZ, one can see that having to have 8-10, or more coaxes, "cut" to each band, and in lengths specific to that band or frequency is ineffective, and more than that, impractical at best! Where would one PUT all those lengths of coax, and how would one switch each one into play on each frequency. Yet, amateur operators and commercial HF operators operate multiple HF frequencies with ONE coax of no particular length: just whatever it takes to get from the rear bumper up to the radio in the truck cab. For ME, that's about 7 feet.
Properly set up with a 50 ohm feedpoint matching coil, my antenna works ALL those bands, including 27-28 MHZ with an average SWR of 1.2 X 1. I've worked the USSR, Europe, South America. I used to talk to "Mike" in Barcelona, Spain on 14.245 USB almost every afternoon from the mobile, 100 watts "barefoot".
It just seems like a lot of wasted effort and a lot of imaginary "theory" that is also wasted trying to get that o-o-o-o-o-n-e- e eensy weensie little extra watt by snipping coax and worrying about VF. And then one starts to mention "ladder line" to a coupler and dipole to muddy the works!!!!
Slowmover1 and slim6596 Thank this. -
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