[R-390] SSB / Sync AM Detector

[comcast]

folks. 
I also did a similar cheat feeding the IF into a rycom freq. selective voltmeter.  fsms generally do not have AGC so while the sideband detection worked great , it was a pain going back and forth on the stepped attenuator. Jeff

Sent from my iPhone

> On Jul 7, 2022, at 6:41 AM, Tom M. via R-390 <r-390 at mailman.qth.net> wrote:
> 
>  I did a cheat once by feeding the 455 IF into a Sony portable with a good sync detector and ext speaker on the Sony.It worked but I felt like it wasn't original boat anchor stuff so I stopped.
> 
>    On Wednesday, July 6, 2022 at 10:51:05 AM CDT, Tom Frobase <tfrobase at gmail.com> wrote:  
> 
> I was interested in finding a solution that would work with the 455KHz
> output of the 390 radio.  I found this article in an old ARRL publication
> and built it a few months ago.  The parts were fairly easy to find, I
> crossed the inductor to a Coilcraft part, the 4:1 50 ohm transformer I use
> on my loop amplifier product..  The bonus was the synchronous detector.  I
> added a LM386 later to drive a small speaker.  It is all on the revised
> circuit board.
> 
> The circuit board layout was a quick one, but it seems to be effective.  If
> anyone is interested in building your own, send me a note, I can supply the
> circuit boards and some hints on where to find the parts.  I built the
> prototype in a Ten-Tek case but thought a 1 or 2 U rack box might be a
> better choice.
> 
> Pictures are located here http://www.kitparts.com/390_Detector/
> 
> original article
> http://www.arrl.org/files/file/Technology/tis/info/pdf/9307028.pdf
> 
> Tom, N3LLL
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