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My cobra 29 ltd classic will Tx andf Rx but will not receive or transmit sound. It recievesd a strong signal and transmits a strong signal. Still has a 10 watt dead just no sound.

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This is a common problem with this model. If you have knowledge in electronics and have access to an electronics shop and in possession of a soldering iron and a multimeter you can fix it yourself and kindly don't neglect for future safeguarding. Here is your solution.
Look for the collector of TR-23, you should read about 4.5 V with a dead key. If you find that this voltage is not present, check on the opposite side of R-120 for 6.5V. Most likely this voltage will not be present; if this is the case, C18 has shorted and needs to be replaced. This is a 330uf, 10V electrolytic capacitor beside L31. To prevent "future" problems, replace with a 16V unit.

Posted on Jul 13, 2010

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2 Answers

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

1 Answer

Cobra 29LTD Classic RX seems to go off frequency. Transmit is fine, but can't receive on same channel. i.e. TX on Ch 11, but RX some other frequency. Was talking to my wife and suddenly, her signal was...


all functions of the radio are performed by the main IC 2816c . The frequency is controlled by this also and if it is blown you will loose your frequency and the problem that emits is in your statement.

Oct 23, 2011 | Cobra 29 LTD CB Radio

1 Answer

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

Oct 18, 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

Radio lights up, but no TX/RX.


Hi and welcome to FixYa,

Based on your description, a possible drift in the local oscillator.  Check the 10.24Mhz crystal filter and its local oscillator for output and consistency.

Good luck and thank you for asking FixYa.

Aug 24, 2009 | Cobra Radio Communications

1 Answer

No squelch


Yep that should happen.
Green or no color in receive mode
Red when you key the mic to let you know when you are transmiting

Feb 28, 2009 | Cobra 29 LTD CB Radio

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.

Feb 13, 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 LTD Classic not transmitting or receiving


ant. light should only come on if you have a high vswr a bad thing did you check that cb/pa switch is set to cb check your swr this is not a good place to mount ant. as it is close to metal of back of cab

Dec 20, 2008 | Cobra 29 LTD CB Radio

1 Answer

No receive cobra 29 ltd classic


Hi and welcome to FixYa,

Initially, pls confirm that there is modulation (transmit audio). The reason I asked is if IC4 (TA7222P) is blown, then the radio would have no audio amplifier which would explain no receive audio. Additionally, the final and pre-final (TR15 & 15) gets is modulated TX+12 through D8 from T1 which in turn is the output of IC4 through C48.

Perhaps a schematic diagram may be of further help.

Good luck and Thank you for using FixYa. Happy Holidays.

Dec 18, 2008 | Cobra 29 LTD CB Radio

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