[R-390] SSB Product Detector

[Dan Merz]

Hi,  I made Ed’s unit using a bfo coil/can from a national receiver.  I also made a bfo using the bfo  pto from an R-392 for another receiver. I like this unit better. These may still be available from Fair.  Dan

Sent from my iPad Air2

> On Aug 10, 2019, at 8:23 AM, Stan Gammons <sg063015 at gmail.com> wrote:
> 
> Hi Ed,
> 
> Yes, the one AI2Q did is the one I was thinking of.  But, where can one find crystals for it these days?
> 
> Using a BFO sounds like another option. Maybe a better one.
> 
> Thanks for all the replies.
> 
> 
> 73
> 
> Stan
> KM4HQE
> 
> 
>> On 8/10/19 9:05 AM, djed1 at aol.com wrote:
>> 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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