Success (so far). I replaced IC503 and now have a nice 5v TTL level signal out on both sides. BS170s not installed yet. Waveform attached.
This was on 20m. I tried 6m and it was bit lower amplitude at 4v. But still much better than before.
The IC501 and IC502 XORs also have a nice clean output now.
Onward..
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Randy, N4OPI
