[R-390] SSB Product Detector

[Alan Victor]

A varactor tuned BFO at 455 kHz is straightforward to build. I did one for
a HB receiver which used a 500 Hz wide Collins mechanical filter; CW.
Stability is excellent, less than 50 Hz/ day. For SSB, a cake walk.

Alan W4AMV

On Sat, Aug 10, 2019 at 10:35 AM Dan Merz <mdmerz at frontier.com> wrote:

> 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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