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

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My radio just recently incurred this problem. It receives WX band, uses PA correctly (mic transmits over PA). It will not receive or broadcast over any standard CB channel (1-40). The needle is just dead. It doesn't even receive anytthing with squelch all the way open. Don't know if it's a bad antenna (checked wiring looks okay) or something wrong with CB.

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Hi, do you have the switch in CB mode ? Might be the audio chip, or the Finals, you will need a tech to do the job so he can set the ma on the finals. Hope this was helpful....My name is John. Thanks....good luck...

Posted on Sep 01, 2010

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In CB mode (on CB channels) the radio will mute when transmitting. So... a guess is that it is muting, or transmitting all the time in CB mode. Check for a mic problem by removing the Mic from the radio ... if it receives CB with no mic connected, then there is an issue with the mic. Otherwise, unless the unit is in PA mode (public address mode) it is likely something internal and beyond the scope of this service.

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Antenna good? Receive meter move at all? radio show transmit when key mic? more you tell me the better I can help---I will assume you know enough to make sure RF gain and squelch are set correctly.

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I have a Cobra 18 wx st. I am not able to transmit anything on it. I have checked the antenna cables and and all external connections. I receive all the wb just fine but the CB gives me nothing. I tried a...


That's usually a defective amc stage that produces RX audio and TX modulation. It's an integrated circuit that will require a tech fixing it. You will have a transmitted carrier with no modulation, and no sound in your speaker. However, make sure you have a good mike plugged in first, and substitute a known good mike to verify it's not the mike. With the WX band working, the above may not apply.

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You have a bad microphone. There is most likely a broken wire in the microphone jack.

Without a microphone the radio will not go into receive mode, at all. Same thing happens when there is a disconnected wire in the mic cord. Because the radio you have, has Talkback in it, you can always hear a little audio coming through, but not a lot.

Try a new mic or one you know is good.

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Take the cover off, flip it over solder side up, check all solder joints for cracks, cold solder joints, check the safety diode where it comes in the radio, before I go further, can you pick up the weather channel?...Does the PA work?...need to check the pre-driver and finals,audio chip, hook up the power meter using a coax three foot jumper from the output from radio to the input of the watt meter, then the antenna, first check the SWR, on the scale on the meter to cal/swr mode,adjust it to spec, then while still keyed down turn the dial to SWR,if it is the safe range your ok,then turn the Dial to 10 or 20 watt scale and key the mic. Does it have any wattage? If not suspect the finals, they are located on the back rail, if it does have RF then its the audio chip, its located on the right side rail facing you,closest to you.remove it and replace it with same ....hope this helps....

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1 Answer

We have a Cobra 148 nw st Sound Tracker When


It could be..
Final blown : worst case
bad mic : try another one
CB/PA switch on PA instead of CB
CB/WX swithc on WX instead of CB :you cannot transmit on weather.
Broken wire on mic jack.

Try the mic and switches first, and if that doesn't help you may need to take to tech. You can find one at a cb shop usually at truck stops.


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1 Answer

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If try another mic and see if problem is still
there then you have half of the problem,the
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you will have to go inside of the unit.
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1 Answer

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hope this helps.................good luck!

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