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yep, could be any of a few things.


here is what I would check..


with the mic out of the radio, measure the voltage at

TR21-base.    it should be "high" about 8 V  

if not, then find out why.  maybe C117 is bad as mentioned.

And it sounds like you have about 8 V a TR21-collector if it is

in TX all the time.


if TR21 is bad, cut it off board, to be able to receive again.


..


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