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Cobra 29gtl.no tx no rx on am - Radio Communications

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Only has AM but could be a number of things.First,turn radio on,make sure its on CB not PA,turn squelch all the way to the left and RF gain all the way to the right. You should at least hear something by now. If not look on the front of radio and see if any lights are lit.If the tx light and the awi light are lit its because you have a bad match on your radio.Make sure your antenna is grounded so your signal can be picked up. take a piece of wire and touch the antenna bracket and a ground at the same time.You should hear something. this is as far as you can go without more knowledge of the radio.

Posted on Aug 13, 2014

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Posted on Jan 02, 2017

  • 19 Answers

SOURCE: Cobra 29GTL Won't Transmit

if the red ant light comes on this means that you have antenna trouble either in the antenna itself or the coax but this should not have anything to do with the radio not transmitting. it sounds to me that you have a bad audio chip or a bad power output transistor. in either case you should really take it to a cb shop and let the professionals solve your problem, good luck!!

Posted on Aug 17, 2007

  • 1 Answer

SOURCE: 29 help

hi, sounds like you have a problem with the SWR' S Probably too high. Tumbleweed01

Posted on Mar 16, 2008

  • 37 Answers

SOURCE: cobra 29gtl

go to cbtricks.com and youll find all the info you want.easy to get 25 to 30 watts if you know what you are doing Thanks...Dean

Posted on Mar 16, 2008

  • 200 Answers

SOURCE: cobra 29 nw ltd won't transmit

Have you cracked the radio open yet?  check for loose connections etc.  get back to me if that doesnt yeild any results

Posted on Jan 22, 2009

  • 1274 Answers

SOURCE: Red RX/TX and red ANT light on my CB

Well,first hand ,some cobra radio,s have red some have green RX/TX lights, but are you modulating? Some green lights turn red. What is your standing Wave on the antenna,s? You need to check it and the output of the radio. To do this you need a watt or field strenth meter. Can get one at Radio Shack. Your standing Wave is ok as long as it is below a 2. That has to be done on the antenna. ..hope this helps...

Posted on Mar 12, 2010

Testimonial: "Thx the rx/tx light is supposed to turn red I found out. Still trying to get the antenna prob fixed though."

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Good day I have an cobra 148 Gtl tx and rx a working but no out put


It might not seem obvious but on many, if not all, current CB radios have separate wires coming from the microphone for RX and TX. It seems like the mic wire for TRANSMIT may be open. It is a common failure.

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Stuck on rx mode


Rx is an abbreviation for receive. (Tx is transmit) There are a variety of reasons a radio will be "stuck" in Rx:
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you will have to take it to a repair shop and let them fix it or buy another one .

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Well,first hand ,some cobra radio,s have red some have green RX/TX lights, but are you modulating? Some green lights turn red. What is your standing Wave on the antenna,s? You need to check it and the output of the radio. To do this you need a watt or field strenth meter. Can get one at Radio Shack. Your standing Wave is ok as long as it is below a 2. That has to be done on the antenna. ..hope this helps...

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Or the audio IC. It could be putting just enough out on AM to seem like its working, and then not enough for side band.

look at the caps near the finals. Look for a burn one, or one that could be twisted, or shorted in any way.

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Your power output has blown, they are called your "finals" they can be replaced quite cheaply.

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Cobra 29gtl


go to cbtricks.com and youll find all the info you want.easy to get 25 to 30 watts if you know what you are doing Thanks...Dean

Mar 15, 2008 | Radio Communications

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