Question about Cobra 29 LTD CB Radio

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Cobra 29 nw ltd won't transmit

I have a cobra 29 nw ltd will rx but will not tx. I have replaced the finals and used known working mics with it, but still have same problem. can anybody help with other place the problem might be?

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  • adinecola Dec 24, 2008

    i have the same problem man does you swr meter drop all the way down when you key up. have you fix it yet

  • beekeeper73 Feb 14, 2009

    I did all of that, still didn't help.

  • Anonymous Feb 18, 2009

    radio will not key up receives great

  • beekeeper73 Mar 03, 2009

    I don't need help with this problem anymore, because I sold the radio.

  • jeffssmit909 Mar 24, 2009

    I would like to know how to change the final if any one knows?

  • Bill Hays May 11, 2010

    for the person that replaced the final (s) transistor.....
    Was it an exact replacement.......?
    like 2SC1969 for 2SC1969? or 2SC1307 for a 2SC1307?
    Several transistors have similar power but different configuration such as EBC or ECB.......


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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

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1 Answer

How do I wire a MIC on a Cobra 29 LTD classic 4 pin mic?


would need to know the mic wire code you going to use. but half moon cut out at top as you look at it is top left 1-4 next row left side 2-3. 1 is cable/ unshield (common). 2 is MOD 3 is TX 4is RX... 1 is wire with no cover 2 is with cover rapped round wire RX is received TX is transmit, hope this helps. newer mic have different code wires so check with meter, red green and blue and shield is on some of the new wiring.

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Cx80, what does the code "rx" mean on the display



  • TX = Transmit. RX = Receive. Does your needle move when you key the mic? Does it modulate when you talk in the mic? Do you have an inline watt/SWR meter inline? What kind of a set up do you have? Mobile? Base? Get back to me if you want further help.
Regards, Tony

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1 Answer

I have a cobra 25 ltd and when i key the mic the gauge of the db barley goes up. is something wrong ? also the gauge says its measuring tx power what does that actually mean/ do


TX means transmit. There are 3 settings for the meter. The top one is to measure your TX/RX that's transmit and receive. CAL is to calibrate the meter to check your SWR.

Reasons your needle may not be moving much when you key while on TX/RX. The dynamic is probably all the way down. That is your mic gain. If you turn that up when you talk the needle will swing more. If the radio is stock and not modded, you can turn this all the way up and leave it.

Also there could be something wrong with the mic. If people can hear you then its not the mic.

If people can hear you fine when you transmit, it may just be a bad meter. Not a big problem, you will just need an external meter to make sure you swr is not high.this is important because if it is over 1.5 you run the risk of blowing the final transistor.

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1 Answer

Radio stays transmiting after mic released


What happens if you "key up" and "let off" and the transmitter "hangs", you remove the microphone plug from the Cobra ?
Will it still be transmitting or will it stop ?
If it stops, the problem is in the microphone with a "hanging" switch which you can easily clean or replace.
Iif it keeps transmitting while the mike is disconnected, there is a problem with the Rx/Tx switching circuit. This needs further investigation by use of a circuit diagram.

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Codra 29 nw ltd classic


For the money,the Cobra 29 nw/st is just as good if not better than a Galaxy. Cobra is more durable by far. I have had 3 of these cobra's in the last 30 years. Only had to replace the last one because the tractor got hit by lightning.
Sure would not pay big money for a name.

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1 Answer

29 help


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

Mar 12, 2008 | Cobra 29 WX NW ST 40-Channels Base CB...

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