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

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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

Posted on Nov 29, 2007


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I have a Cobra 2000GTL that blew a fuse. After replacing the fuse I realized I wasn't hearing anything. I looked at the frequency it is at 27.825 instead of the 27.185. How can I correct this?

You jumped into the Ham band and you should take it to a tech before you continue using it. You should check the other channels too. Start with 26.965 and go to 27.405. For no reason other than checking maybe do upper and lower SB also.

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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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1 Answer

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

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1 Answer

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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
NC Electronic
Mills, Wyoming

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

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,

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

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