I found those 4.224 Crystal oscillators (ex equipment) on eBay .
Divide 4224 by 32 (first 8 and then make the quadrature signals), and the LO frequency ends up on 132 kHz. Not bad for a 136 kHz SDR.
Another Blast from the Past -- Dino KL0S in the early 70s -- A Turner mic,
a Vibroplex, an HQ-100, a DC receiver, and a tech library.
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*Dino: Yes the parallels are really eerie OM. There is that Turner mic.
I still have mine too, but I had to replace the element with an Electret.
Mine ...
1 day ago
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