Replace Q13 if the transmit fails.
Have you switched the antenna back to BITX?
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At 04/04/2017, you wrote:
I just remembered something that might be important, but might not. I was using the Bitx40 last night and was making a contact. I was really light to him so I switched over to my other radio (TS-520). I forgot to shut off the bitx when I keyed up on the TS-520. It squealed pretty loud, but I let off the mic immediately. I don't know if this has any bearing on this or not.