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Re: BitX40 no receive

 

Tim,

Now I conclude that there is no problem with audio stages.

Hearing birdies means everything after the first mixer is fine!

Concentrate on Q1 and Q4 amp and filters. I suspect that there is an SMD that is not soldered well
in the first bidi amp. When you heated the coil you got that lose connection going again.

Gently pressing with a finger on the first amp may show you what is not soldered properly. Sometime
SMD cap ends break off and become intermittent.

Raj

At 14-10-2017, you wrote:
Hi Larry,

There's plenty of audio, plenty of birdies - including one that drifts around. Just no actual signals. The frustrating thing is that after taking out the board and resoldering a BPF coil it was working for a couple of hours. And then it stopped again :(.
--
Tim
4X5TS
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