Question about Cobra 25 LTD 40-Channels Base CB Radio

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No audio out of the radio's speaker or external speaker jack, but has audio from the PA jack.

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The problem could be a range of things. Generally these radios use the same amplifier for the PA and receiver output. If the radio is receiving (usually the needle on the meter moves) then it may be bad contacts on the relay. Before pulling it apart check that the squelch setting is set to low and the RF gain is high. Check that the external speaker jack is not damaged (internally). If all seems OK visually try to connect one wire from a speaker (8 ohms) to the chasis of the radio and then use the other wire to probe different wires that are connected to the external speaker jack and on board speaker to see if you get an output there.

Posted on Sep 07, 2009

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If the radio is showing receive on the meter:
Bad speaker jack connection (broken solder joint)

Posted on Jan 30, 2010

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dburns60
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SOURCE: Cobra 29LTD speaker inop....No audio at all.

There are some different things you could be facing like:
the speaker sound being cut-out by the mic switch, but my first guess is the switch in the external spkr. jack being faulty. Here is a schematic for you.

http://xbones_antennas.tripod.com/id21.html

Posted on Apr 12, 2010

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Why doesn't my radio operate in the "PA" mode?


Some radio's do this (specifically Uniden) for some unknown reason. Ideally you plug a speaker into the PA output and when you switch to PA mode, the CB transceiver part should turn off and only your voice should come out of the PA EXT speaker to make it act like a personal megaphone.

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plug the external speaker into your PA jack and select the PA switch. If PA works then the audio chip is good. The cobra 29 must have a mic plugged in to get receive audio, You may have a broken wire at the mic connector.

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CB Plays out PA Speaker


it is possible that the PA speaker output is intended for a normal (unpowered, unamplified) speaker. Perhaps in your case the audio you hear from the PA speaker is only signal leakage from the PA Speaker connection.
To know.. connect a regular speaker to the PA speaker connector (any speaker, home audio, old car 6x9....). If the PA works and drives the temporary speaker OK, and you hear no CB receive, then the PA output is for a normal speaker, with leakage of CB audio.
It is just a guess, but easy to try.

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CB Plays out PA Speaker


Are you following the user manual that came with the radio?
NB-ANL/CB/PA SWITCH: When the switch is in the NB/ANL position, the Noise Blanker (NB) and Automatic Noise Limiter (ANL) circuits are activated.
The Noise Blanker is very effective in eliminating repetitive impulse noise such as ignition interference. In the CB position, the PA function is disabled and the radio will transmit and receive on the speaker that is connected. In the PA position,
the radio acts as public address amplifier. Your voice will come out of the speaker that is plugged into the PA. SP. jack on the rear panel. The radio does not operate when you are in the PA mode.

When you plug a speaker into the ext. jack does it kill the radios internal speaker? It should until you unplug it; if not and you are following the about you may have a wiring issue with the jacks.

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1 Answer

I Want To Add Talk Back Mod To CB Radio


there is what is known as the Quick and Dirty way, to add talkback to almost any CB radio. You will need a 130 Ohm 1/4 watt resistor. Open the radio and find the two mounting points for the external speaker jack and PA audio jack, you will want to solder the resistor across from the Positive connection of the PA jack to the Ground connection for the External speaker jack. This will give you talkback, and eliminate any feedback when the microphone is held at a normal operating distance away, Just remember, (This could potentially damage your radio if done improperly, I will not be held liable for anything that you do to your radio.) However, when done correctly this is a perfectly safe modification, and will allow you to monitor your output audio, as it is being transmitted. You can adjust the size of the resistor to your liking, however, I do not recommend anything lower than 100 Ohm, as there will be more potetial for squealing/feedback.

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1 Answer

Cb works but there is no sound


turn volume and mic gain half way up, plug in an external speaker into the PA jack, flip PA switch and key up, if it doesnt squeal your audio final is blown or it could be so simple as mic wired wrong or broken wire. try another mic.

Mar 31, 2013 | Cobra 29 LTD CB Radio

1 Answer

Have a uniden pc 68 elite it seems everything works the whene transmitting the needle moves a. but it has no volume it makes no noise i have tried a different mic i have put a new ext speaker on it and it...


Could be audio chip.
  • Insert external speak jack into pa port.
  • Turn volume down
  • Switch cb/pa switch to pa
  • speak into mic
if you are getting audio from speaker ......chip is fine.

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1 Answer

My connex 3300 wont transmit anymore and the talk back wont work either,i have tried a different mike and when you key it up the meter still won't swing.


Plug in an external speaker to the pa jack ... Switch the band selector to pa and see if you hear yourself... No? Bad audio chip

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1 Answer

29 nw LTD no audio on receive out the speaker in the radio or through the ext speaker and on transmit no audio.Radio shows a 4 watt dead key


If you take your external speaker and plug it into your PA jack in the back and key up your mic do you hear anything. If so then its not your IC chip if not its your IC chip and it will need to be replaced.

May 14, 2010 | Cobra 29 LTD CB Radio

1 Answer

Cobra 29LTD speaker inop....No audio at all. Speaker Ohms out ok as do speaker leads from board to speaker. External speaker jack is inop. PA works in PA and CB modes. Other than speaker issues, radio...


There are some different things you could be facing like:
the speaker sound being cut-out by the mic switch, but my first guess is the switch in the external spkr. jack being faulty. Here is a schematic for you.

http://xbones_antennas.tripod.com/id21.html

Apr 12, 2010 | Cobra 29 LTD CB Radio

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