Question about Cobra 29 WX NW ST 40-Channels Base CB Radio

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29 help i got a cobra 29 nw ltd classic power up but no tx & rx mic is ok driver ok final ok meter will not move . what would you think ?

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

Posted on Mar 16, 2008

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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.

Oct 10, 2014 | Cobra 29 LTD CB Radio

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Where can I find a new replacement modulation transformer for a cobra 29 ltd classic?


simple,just chech the input resistance and out put...they should have even small resistance always example .5ohms .3 ohms it counts...

Feb 01, 2014 | Cobra 29 LTD CB Radio

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Cobra 29 ltd Classic no sound, no rx, all lights work rx,tx, lite up. The SWR meter moves when mic is keyed up.


Check speaker and plug external one in if you have it.

swap mic could be a broke wire or bad switch in handset.

check antenna and coax connections.

i know checks sound basic but they could save you a lot of headaches later

May 31, 2011 | Cobra 29 LTD CB Radio

1 Answer

Cobra 29, no rx, no tx, pa dose not work, good mic, good ext. speaker, mic. gain all the way up, and you can see meter in face neddle moveing it rec. just no audio at alland no modulation.


Not sure which model you have as there are at least 13 cobra 29's. I am using the LTD as an example. You say good mic? Is it made for this model? If it is good then I would have to say the final audio stage is not working. The TA72222AP is the IC that is the final audio amplifier. Check pin 1 of the TA72222AP ic for 12 volts. If 12 volts is present then replace the audio IC TA72222AP. If 12 volts is not present then you have power supply problems that are internal. The conclusion I have made is based on no rx audio, ( could have been the jack at the pa and ext spkr) but you say they don't work either, also no meter movement during modulation check (that does not need a spkr to make the meter move) so yes I'm 99.99% sure its the final audio stage is a bad. If your model is not the LTD then the IC could be different but still the same audio final is bad. Replace the part which should be fairly inexpensive. If it uses a metal heat sink be sure to apply heat sink grease when installing new part.

Feb 26, 2011 | Cobra 29 LTD CB Radio

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.

Oct 11, 2009 | Cobra 29 LTD CB Radio

1 Answer

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

Dec 23, 2008 | Cobra 29 LTD CB Radio

1 Answer

Cobra 29 issues


Check D23 and D28. They are polarity protection diodes. It could also be the power knob.

Nov 09, 2008 | Cobra 29 LTD CB Radio

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COBRA 29 NW LTD CLASSIC


Capacitor C-82, which connects the output of the driver to the input og the final, is leaky or shorted, putting +12 volts on the base of the final, which blows it immediately.

Mar 28, 2008 | Cobra 29 WX NW ST 40-Channels Base CB...

2 Answers

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.

Mar 19, 2008 | Cobra 29 WX NW ST 40-Channels Base CB...

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