[GreenKeys] CV-3510 Demodulator - connected to itself

[Jeffrey Golas]

Still working on a Navy CV-3510 demod. Same one as I mentioned before, except I made some headway with it and it seems to be in a much better place but not quite there yet. (Really only in CRT, I had it copy 8 minutes of TTY flawlessly yesterday).

As part of the adjustment instructions, it had me connect the input and output jacks together and enable "retransmit", which technically creates a loop. Interestingly the crt just had a bit of a dim square to it. Then it said to enable reverse, which put it into a tizzy, yet the instructions said to adjust a signal at a test point for minimal AC, butit was a really crazy waveform and adjustment wasnt changing anything.

So should that kind of setup create an oscillating mess like Im seeing? I may have to readjust again, the mark signal is now clean and perfect on the CRT, but space is still an oblong oval. (These adjustments are for balancing them out)

The bottom one in this pair, which I thought was working well, I tried to use it as a reference, but it turns out to have its mark/space freq all out of wack so that'll be next.

Jeff KC3GJX