Question about Cobra 29 LTD CB Radio
You may need to retune the antenna system if the coax has not been kinked or damaged. If you simply moved it over from the old rig, the antenna was tuned to that layout and the groundplane was the shell of the truck and chassis. The Cobra can tune it somewhat, but the best results are achieved with a baseline adjustment of the antenna. But check the coax for damage first, then check the connections to the antennas. If you are using a baseloaded whip, there is actually an inductor wound that attaches to chassis/coax ground, and it may be corroded. As may the center conductor terminal at the antenna.
If those sheck out okay Check to see if your SWR is higher on 40 than on 1, or if it is higher on 1 than on 40.
if it is higher on 40 than on one, shorten the antenna slightly, first and see how it looks.
If it is higher on 1 than on 40 try lengthen it slightly and see how it looks.
If you are running with dual whips, that complicates matters a little bit due to phasing.
I had set up a radio to be portable from vehicle to vehicle and found changing tuning length was always required when I moved it to a new vehicle. What made matters worse was I chose a cheap Walmart baseload and it had lousy quality coax.
Posted on Feb 20, 2012
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Posted on Jan 02, 2017
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