Question about Cobra 29 LTD CB Radio

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I have a Cobra 29 wx classic and i get talkback through the speaker, and it doesn't have talkback installed!! How do i change this and what is wrong!! The radio works awesome rx/tx, but it just has this problem!!

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  • Dottie Gentry May 11, 2010

    did you buy that new or used..because someone might have put talk back in your radio..some people like to take the squelch out and put it in there...

  • Wes McKay
    Wes McKay May 11, 2010

    Is the radio used or bought from a CB shop?



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Have you tried using a different mic that you know is working properly? If it still has feedback, then someone has installed talkback. Take the top off, check for a resistor between external speaker and pa speaker ports. Remove resistor if it is there and that should remove the talkback. Hope this was helpful.

Posted on Feb 14, 2009


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Probably to Chassis Ground. You may want to experiment with the resistor value if you use a power mic. A 100 Ohm resister may be too low a value and cause audio feedback if you do use a power mic.

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When the mike is keyed to TR my audio comes thru the speaker. Cobra 29 LTD Classic. Best Regards Jim

If your voice is coming through the speaker when you transmit, it means you have talkback installed. If you don't like it, take it to a reputable CB shop and ask them to remove it.

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I have a Cobra 29 WX NW BT and i can not receive any transmisions unless the other CB user is right beside me. If they move more then a car lenght away i can see the signal come in but no voice. Also my PA...

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.

Jun 11, 2010 | Cobra 29 WX NW ST 40-Channels Base CB...

1 Answer

Want to get talkback in a cobra 29

When you key up the mic ungrounds the speaker so you don't hear anything through it, so to get talkback you're putting a 100 ohm 1, or 2 watt resistor between the switched side of the speaker and ground, now when unkeyed the mic grounds the speaker as usual, but when you key the resistor allows a bit of audio from the audio amplifier, not decoded RF, to still get through. I think the pa/ext spkr. jacks are a convenient place to connect it. You may decide to control talkback by running the circut thru a switch like brite / dim switch . Want less talkback, use more resistance, 150 ohm . Too much talkback can become feedback . I hope this helps, J

Nov 25, 2009 | Cobra 29 LTD CB Radio

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Weather bleads Over on 21 LTD WX CLASSIC(*HELP*)

sounds like your wx receiver is being activated by a bad switch replace the switch to disable the wx when you dont want it to come thru

Jun 10, 2009 | Cobra 29 WX NW ST 40-Channels Base CB...

2 Answers

I want talkback on my cobra 29ltd classic radio how do i do this myself

Open the case on your radio. Solder a 100 ohm resistor between the pa jack and ext speaker jack. You can add a switch if you like to turn it on and off. The lower the resistance, the louder the talkback.

Mar 30, 2009 | Cobra 29 LTD CB Radio

1 Answer

Meter and St lights

The backlit nightwatch lights can not be repaired, they are fiber optic lights that are ran through the faceplate by the factory.

As for the squealing, the normal way talkback is installed on these radios is to solder a resistor, 68 oms up to 100 ohms, from the PA to the External speaker on the solder side of the PC board. The more resistance, the lower the talkback volume. Yourse is probably squealing because the resistor is breaking down, I just fixed a radio 2 days ago with the same problem. If you want to remove talkback, just open the case, flip it tothe solder side, and remove that resistor that was installed, or you can replace it with a new resistor and still have talkback.

The meter is fairly easy to replace, you just need to get a new meter, make sure it is one for the Cobra 29 (it will have the 3rd line to show SWR reading, which the Cobra 25 does not). You remove the case screws, the face plate screws, and then remove one screw and loosen the other that hold the meter inplace. You will have to solder the two wires to the new meter, observing which post they came from, this will determine the direction the meter swings. You just remove the light bulb and put it in the new meter casing with the rubber stay. This will be self explanatory when you open the radio.

Now for the dead key. It may have had a swing mod done, which drops the dead key down a couple watts. This is actually a good thing. If you have a lower dead key, this will allow you a larger range of power to swing. You can tell if it has had a swing mod by looking at JP36 to see if there is a jumper or a Capacitor installed. If there is a capacitor, the it has been done. To change back to factory, remove the resistor that was soldered to the solder side, across the capacitor, then remove the capacitor. Now just install a jumper in the place. Here is a link to the Modification Instructions, so you can get a better understanding:

If I left anything out, or you have more questions or need further clarification on anything, don't hesitate to email me

Dean PItts
Rollin CBs

Aug 07, 2008 | Cobra 29 WX NW ST 40-Channels Base CB...

1 Answer

Cobra 29 WX

This "talkback" feature may be due to someone having modified the radio by adding a small resistor between the speaker circuit & circuit ground.Another cause could be the shield lead in the mike plug shorting to the plug itself.

Apr 23, 2008 | Cobra 29 WX NW ST 40-Channels Base CB...

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