The manufacturers will tell you the velocity factor. It says:. Draft saved Draft deleted. Changing its length does the same thing as changing the length of the antenna: it can alter the radiation efficiency and impedance and thus SWR of the antenna. N9IURSep 26, I asked the sales person if it is best to shorten the coax after installation to only the length required to reach the radio transceiver and they said "I would just leave it, the length is already optimized for maximum efficiency at the factory".
It's also a good idea to use a bit extra to route the cable neatly and I have always heard that 18' is the proper length for radio to antenna.
Best CB Antenna How to Choose CB World
Never key up or attempt to operate your CB without a working antenna or " dummy to the radios antenna jack, unless you have extra money to buy another radio, of high performance antennas recommend a specific length of coax cable. The coax cable is a means for transferring your RF signal to the radiating If my antenna is 65 feet away from my radio, I need a foot jumper from the radio every 18 feet as it travels through the air on CB frequencies, we can come up.
Does effective grounding of mobile vehicle antenna mounts address common-mode currents?
When running dual antenna's, is it really that big of a deal to run 18' per side? Some people will purchase regular coax cable and try to use a T-connector to install everything.
Video: Cb radio antenna cable length Some Myths about Coax
Sep 18, 3. In other words, there is no special length needed, no magic measurement that you buy so your radio will work better.
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Remember, they say it is that 18' length that gives the zero voltage point that makes that null cable, so to speak.
Cb radio antenna cable length
|The CB signal is an RF sine wave, which rises above and drops below a zero reference point once each full cycle or a complete wavelength.
The issue is that CB operators have more interest in superstition than a proper understanding of RF engineering. This zero voltage point will be repeated again one half wavelength down the cable.
Robert Erhard Sr. Remember, they say it is that 18' length that gives the zero voltage point that makes that null cable, so to speak.
Exposing the 18' CB Coax Myth
Information describing the myth behind the 18 foot coax length. need 18' of coaxial cable between your CB radio and the antenna so it will tune up properly. How Long Should My Coax Cable Be? Question: I have a resonant antenna on my roof and my transmitter is located in my ham shack in the basement.
This is advantageous for tight mounting situations.
Well, when you mix bogus info and half truths and misinformation together, you get a bunch of gibberish that the average person sucks up like a cold drink on a really hot day. The result is If you have the short shaft W2K's that dont get the "cone" above the cab,you'll need to correct that by getting the longer 10" shafts. A popular CB antenna is a vertical which is installed with no ground plane, or an insufficient ground plane.
The coaxial cable running from your radio to the antenna is VERY important.
Video: Cb radio antenna cable length CB Radio FAQ #1 - What is the correct length of cable?
Everything you transmit and receive must travel along it's length. All too often, the. When running dual antenna's, is it really that big of a deal to run 18' per side? A full cb radio wave length is 36 feet, so ½ a wavelength is 18 foot.
The velocity factors of Belden coax cables used by most cb shops are.
Draft saved Draft deleted. It is important for you to remember the wavelength values since we will need a couple of these numbers later on. Even in this case, it's hard to say just what the "optimum length" is, because feedlines tend to be routed to, around, or near other conductive objects like the radio chassis, and through the negative power supply lead, the car bodyand these too will alter the operation of the antenna.
In other words, there is no special length needed, no magic measurement that you buy so your radio will work better. Before I show you the proof, you need to understand a couple of very basic RF facts.
The cables commonly used for CB applications have a VF range from about. How do you correctly determine the coax length?