[R-390] SSB Product Detector

[djed1 at aol.com]

You may be referring to one by AI2Q, who did a version of my converter with crystals.  However, I have subsequently modified my converter to crystals, then back to a tunable BFO using a surplus R-390A BFO coil.  I've found the tunable BFO to be stable, with the added benefit that I can tailor the BFO to the filter selected (you really want the BFO to be at the edge of the IF passband).
Ed  W2EMN

-----Original Message-----
From: Stan Gammons <sg063015 at gmail.com>
To: R-390 Forum <r-390 at mailman.qth.net>
Sent: Sat, Aug 10, 2019 12:34 am
Subject: [R-390] SSB Product Detector

Hi All,

I've been away from the list for quite awhile. But some time ago someone 
sent me the schematics of a SSB product detector they made. I forget who 
sent me that. It used a MC1496 and 456.3 Khz and 453.6 Khz crystals. 
Since we lost ICM, there isn't very many options for crystals anymore. 
Bomar has a minimum of 10 pieces and QuartSLab wants big $ for low 
frequency crystals. Anyone know of another source for crystals?

Thanks


Stan
KM4HQE

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