Question about Cobra 29 LTD CB Radio
"Sometimes the CB will put out more power on a channel than is needed?" Perhaps true, but in 99.9% of situations, the problem is being caused by an impedance mismatch. And this impedance mismatch is being caused by the antenna being out-of-tune (for the frequency of transmission), OR perhaps the antenna has a very low "Q", or bandwidth. This ("low bandwidth antenna" may be the case mentioned by paularenee1, as the SWR seems to be increasing at both the lowest and highest frequencies of the CB).
Given that... Tune the antenna for lowest SWR on your "home channel" (or the channel upon which you most converse) and forget about it...
Remember: (for copper, anyways) length in feet of 1/2 wave antenna = 468/freq in MHz.
Posted on Mar 20, 2009
This is a common problem in CB's. You can either get the radio tuned properly or tune the antenna. Sometimes the CB will put out more power on a channel than is needed and this could end up in a damaged radio. You can get the radio tuned to prevent the RADIO from high SWR, or you can tune the ANTENNA so tha antenna will better suit your CB's power.
Hope this helps!
Posted on Jul 01, 2008
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Posted on Jan 02, 2017
What sort of antenna are you using? Wilson, K-40, etc? Also, is the antenna right near any metal or perhaps you have heated rear glass (which means you have thin strips of copper in close proximity to your antenna).
Any of these things can cause enough impedence mismatch to cause your VSWR to rocket skyward.
Posted on Mar 06, 2009
SOURCE: high SWR
the problem is in the antenna cable. the lenth of a antenna cable must be divisable by 3. try replaceing cable with a 18 foot cable that should fix the problem.
Posted on Apr 22, 2009
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