Question about Cobra 29 LTD CB Radio

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My cobra 29ltd cb radio will power on and recieve but will not transmitt. the transmitt light lights up but the meter will not move. what can I check?

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Blown RF Transistor mostly due to running a high SWR(bad antenna)

Posted on Jan 30, 2010

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I am assuming you have called out for a radio check and not gotten a reply, or even better tested it with friends radio. Just because the meter doesn't mover doesn't mean that its not transmitting.

So as long as you tested it with another radio, and it is not transmitting it could be any number of things. If you have never had antenna tuned so the swr is low, or your swr was high for a long time, your final transistor is most likely blown.

TX switching transistor could be blown, trace could be gummed up.

If your ant light is coming on, the is a problem with your antenna. Could be disconnected, and that can lead to a blown final.

At any rate, your problem most likely requires a tech. Take it to a repair shop.


Posted on Oct 01, 2009

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1 Answer

Trying to setup a cobra 29ltd chrome. Put on channel 20, switch set on cal, keyed up the mic, and when I turn the swr cal knob the needle won't move. Magnetic ant with acc outlet for power Any ideas


First, make sure that the CAL/SWR/RF switch is set to CAL. If you still can't move the needle, check the RF output. If the needle moves to the far right, you at least have output power, and something is wrong with the SWR circuitry. Does the needle move with incoming signals?? If the needle doesn't move, then you either have a damaged meter. If the needle moves on rec eived signals but not when you transmit and the switch is set to RF, then you most likely have a damaged transmitter output stage.

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Red lights come on tx n rx and antenna come on when I key up the cb radio and the swr meter doesn't move


if a mod has been done to the cobra 29 (all 29,s)the light will come on just find vr6 audio the radio as it comes on adjust vr6 untill it goes away,,,,always trust your watt meter(s.w.r scale)over the flashing light its really easy to do it beats paying a shop $10-$15

Jan 13, 2013 | Cobra 29 LTD CB Radio

1 Answer

I have a 29ltd classic...no transmitt that i know of, recieves but is weird soundin, like people are underwater...recieves on PA, or CB..and channel 19 comes thru on all channels..??? could it be just the...


Sounds like the mixer crystal has gone bad, or the VCO is out of whack, and the radio needs to be aligned.

worst case scenario is that the PLL has gone bad. In which case the radio will need to be fully aligned after replacing.

Nov 14, 2010 | Cobra 29 LTD CB Radio

1 Answer

Cobra 29ltd CLassic, TX power and audio is ok, volume from spkr is good, squelch works but no cb recieve.


Try a new Mic. Make sure its a working mic. If you have a bad mic, the receive will not work.

Aug 22, 2010 | Cobra 29 LTD CB Radio

2 Answers

Does the rx/tx green light stay on all the time? Cobra 29LTD


Yes the light will stay on and change when you key the mic

May 07, 2010 | Cobra 29 LTD CB Radio

1 Answer

TO SETUP MY SWR, SHOULD I USE THE METER IN THE RADIO OR AN EXTERNAL SWR METER . THE SET IS THE NEW 29LTD BT. ALSO AT TIMES THE ANT LITE COMES ON WHEN TRANSMITTING. IS THIS NORMAL?


Always use an external meter to set SWR. If the ant. warning light comes on it indicates a problem with the SWR. Check it with external meter.

Oct 19, 2009 | Cobra 29 LTD CB Radio

2 Answers

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Hello there
here is a link for the scematic ok?
best regards michael

  1. Cobra 29LTD ST, 29WX ST 29LTD ST Owners Manual. 29WX ST Owners Manual. DIAGRAMS. 29LTD ST Schematic Diagram ... WX Schematic Diagram. 29LTD, 29LTD ST, 29WX ST Factory Service Manual ...www.cbtricks.com/radios/cobra/29ltd_29ltd_st_29wx_st/index.htm - Cached

Sep 15, 2009 | Cobra 29 LTD CB Radio

1 Answer

Cobra 29LTD CHROME low tx no mod, rx good low Vol, talkback good


1 why would you change the finals?? Have you checked you antenna? How are your SWR's? Crappy antenna's cause a lot of problems.

Use an external meter to see what the SWR is, and see what the output is PEP. If its low, then there is something wrong. If it is High, change the mic and turn up the dynamic all the way.

Next. Have you been messing around in there?? Tryin to get more wattage? You turned VR4? If you thought you were turning it up by turning it all the way to the right, you turned it all the way down. Turn it all the way to the left.

Jun 05, 2009 | Cobra 29 LTD CB Radio

1 Answer

Cobra 29 ltd classic cb not transmitting


Check the ground. Make sure its grounded well on bare metal. To see if the ground is bad, or not making good connection, disconnect the antenna and turn it on. if it does not power up, that means your ground is bad, and it was grounding only through the antenna.

Make sure not to key up with out the antenna connected.

Dec 24, 2008 | Cobra 29 LTD CB Radio

2 Answers

Signal meter


The signal meter would go into the antenna path something like this:

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