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I am a truck driver.I have no problem with my cb,but my mate has a problem with his.It is a new set,not sure which make.When he first uses it in the morning you can hear him perfectly for about 15-30 mins then he is very low and faint for most of the day.He is receiving 100%, the problem is just his transceiving.Please can you help?

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Antenna is probably not tuned for best SWR. He is beating the final in the radio, and its over heated after about 15 minutes of uses, and if he keeps using it with out tuning the antenna for lowest swr, he will kill the radio.

Posted on Nov 09, 2010


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Since your concern is both on receive and transmit, the common denominator would be the antenna system. The antenna should have a metal mounting to serve as the ground plane. Said mounting/ground plane must be electrically grounded to the rest of the truck. The next area to check would be the PL-259 connector. It should be soldered/connected right with no shorting. Next would be the cable which should be low loss RG-58. Last to check would be the SWR of the antenna. Most mobile antennas could be fine tuned to a specific frequency/channel by adjusting its length. There would possibly be 1 or 2 Allen screws for this purpose. In some cases, it may be necessary to trim off a few mm of the rod.

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Thank you for using FixYa.

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