Question about Cobra 148 GTL 120-Channels Base CB Radio

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Cobra 2000gtl no sound comeing out but will talk on am and ssb can you help

Everyone tells me that they can hear me good on am and ssb very good but i can;t get any sound comeing out of it or no incomeing sight on the meter the meter don;t not move any even if i key a other cb up sitting right next to it could you tell me what to look for or what to change to fix this i really do like my cobra 2000 and would like to see it playing on the air again thanks for any help I just bought a new cobra 29ltd classic because my old one all of the sudden dint have any sound coming out but i could be heard this new one has the same problem what could be wrong?

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Use an external speaker and see if the problem still exists . If the external works then check the wires to the internal speaker . If neither work you may need to find someone that knows what they are doing and have them check it for you.

Posted on Mar 02, 2017

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1 Answer

I'm searching for a owners manual for Cobra Micro Talk H302015077


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Hi, I have a Cobra 2000GTL Taiwan made PC board number pc497ab The set has been stored for a while (couple of years) and I just received it,I switched it on and (with antenna connected ,SWR 1.2) and the...


It would be very hard to diagnose the problem from just the informations listed. My experience is a radio that has been sitting will have problems with the electrolytic capacitors drying out and throwing the receive tuning way off. The capacitors are the small metal can looking devices on the board. There are a lot of them. The top of them should be flat. If one is rounded on the top it is often times bad. Of course it could be a transistor in the receiver chain. Just one bad one will stop everything. It could also be a bad solder joint. You can try pushing gently on different places on the board with something non-metalic like the body of a plastic ink pen. Flex the board slighty and see if you get a change in sound or you can hear other stations. If so, you have the delicate process of tracking down the bad joint and repairing it. Just lightly using a solder pencil to remelt joints will often solve this type problem. If you can't find it then it will take a technician with the proper equipment to track it down. Good luck.

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May 24, 2009 | Cobra 25 LTD 40-Channels Base CB Radio

1 Answer

I can hear people talking, but they can't hear me, or they say I sound like an alien


Check to see if the meter needle is swinging backwards when you key up. If it does your final may be bad. If the needle goes forward and others say they see your keying up but no sound your audio chip may be bad; especially if you have tried so many mics and antennas. If your radio has a swr warning light and it comes on this could extremely limit your range and others may not hear you and contiued use will damage your radio. Good luck!!!

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Sounds like a bad or miswired mic. Try a new mic ( use the proper cobra mic ). If the problem still continues, check all the swiches on the front of the radio and make sure you don't have any cold solder joints ( broken lead to board connections ). Good Luck
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NC Electronic
Mills, Wyoming

Dec 19, 2007 | Cobra 29 WX NW ST 40-Channels Base CB...

1 Answer

Cobra 2000gtl no sound comeing out but will talk on am and ssb can you help


Because you have transmit, more than likely your audio section is OK as much of it is shared with the receive side. A final test of the audio section is to check out the PA function. If it works most of the audio section has been tested.

The signals for the meter movement and receiver sound are developed in the audio detector circuit (diodes D21 and D22) just past the I.F. stages (Transistors TR16, TR17, and TR18). I have seen these diodes fail. They are frail little guys, but are inexpensive. I would recommend replacing them first. Pay particuliar attention to which way the band on the diode is positioned and limit your soldering time. If that does'nt rectify the problem, (no pun intended) you can look at the transitors.
By the way, MOVE that second test radio farther away or you could overload the front end of your Cobra creating even more problems. Good Luck, 302

Nov 26, 2007 | Cobra 148 GTL 120-Channels Base CB Radio

1 Answer

Cobra 2000GTL


Hello wood butcher,

This sounds like a capacitor is not discharging fast enough and has enough residual voltage stored to continue to power the display (to a point). I would check the capacitors that are connected to the vcc of the display matrix and also check to see if one of the resistors has not increased in value due to a possible thermal event.

Tell me how this works out,
Thank you,
Shuttle83

Oct 30, 2007 | Cobra 148 GTL 120-Channels Base CB Radio

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