Transmit Problem - Microphone??

[opawdj]

Hi,
For more than 10 years I've been running a tweaked Uniden PC76XLW CB radio with the original Uniden mike and a Wilson 5000 antenna. It has served me very well when driving throughout the USA. Now I just found out that I cannot transmit. SWR is still okay, TX indicator moves when I press the PTT on the mike. But nothing goes on the air regardless what channel I use. I checked it with another CB. Reception of other CB transmits from other CB users is fine too.
Could it be a defective mike or something else especially since the TX swings over? I don't have a mike tester.

 

[Murstech]

Probably. If you hear volume thats most of the modulating circuitry right there. You need a friend with a scope to test the mike. If the mike is ok then there are only one or two stages left to check wich can also be checked with a scope.

 

[opawdj]

Thanks Murstech. Hopefully I can find someone with a scope. Other than repair shops, how many still have and use a scope now these days. But I'll try.

 

[LtDoc]

Do you hear a carrier when you're checking with another radio? If not, and since the meter is wiggling, I think I'd take a closer look at the radio. (It is getting a little 'age' on it.) Lot's of "if's" in that...
- 'Doc

 

[opawdj]

'Doc, I'm most certain you're right. I will do one more check this weekend. Gosh,I hate to part with this "antique" since it has great long range reception. But it's useless if I can't send. I just may go with a Uniden Bearcat Pro PC78XL which has the dynamic squelch (eases fiddling while driving). I'm not a road-pro, but I travel often by car to anywhere on the mainland. And cell-phones don't keep me informed what's happening ahead of me, hence the CB.