[R-390] SSB Product Detector

[W2xj]

There was a military ISB adaptor for the R-390 although I can’t remember the number I owned one 30 years ago. It was bigger and heavier than an R—390. It worked great.  

Sent from my iPad

> On Aug 10, 2019, at 12:33 AM, Stan Gammons <sg063015 at gmail.com> wrote:
> 
> 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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