cobra 23 help

[bluestallion]

I bought a cobra 23 off of ebay. I hooked it up and it comes on and transmits fine. but i cant recieve. If i watch the meter when i talk on a different cb, and the recieve meter moves with my voice. but cant hear myself on the speaker. i even tried to hook it up to external speaker,but nothing. wondering if anyone would know what would cause this. thanks

 

[T23]

Might be the audio amplifier.


T23

 

[wcsd106]

The cobra 23 radios were notorious for cold solder joints. Remove the top cover and use something non metallic to prod around on the board to see if it jumps back in. I like to use a capped sharpie marker.

If that doesn't fix it, you're going to want to start checking the audio chain from the audio IC to the speaker. The audio IC itself is more than likely working correctly or you wouldn't have transmit audio (would only make a dead carrier on tx)

I may have the schematic for that radio somewhere. If I do, I'll post it here so you can start doing some checking.

 

[bluestallion]

ok thanks. will have to try it and see if anything happens

 

[unit_399]

Blue stallion -

Try checking the squelch control. It should be turned fully counterclockwise. If the control is set ok, maybe the squelch transistor is shorted.

- 399

 

[bluestallion]

I had the squelch turned all the way down, and had my pickup right next to it, and couldnt hear myself any. But when i talked on it i could hear myself on my pickups speaker

 

[JustinDePolis]

One test you could do to see if the squelch transistor is shorted is to turn the squelch all the way up and down a few times, listen closely to see if you hear a click or a pop out of the speaker. If you do, the circuit is fine but lies in the audio section before the squelch circuit.