[R-390] R-390 SSB Product Detector mods?? Not A

[Dan Merz]

Peter,  I use a solid state ssb detector unit with my 390.  It's outboard
and requires no modification of the receiver and connects to the terminal
strips and i.f. output on the back of the receiver.  It has agc control
built into it which is the main reason I went with this particular version
in contrast to a more commonly available version without agc.  I couldn't
see going to the trouble of adding such a unit unless it provided some agc
that alleviated knob twisting to handle strong ssb signals.  My unit was
designed by AI2Q, and I believe I have a schematic on file that I could look
for if you are interested and contact me off the group direct. It uses 5
transistors and a 1496 IC with built in power supply, all built into a 5X9x2
1/2 inch box. The unit could be a lot smaller if one wanted to make the
effort.  I built mine using some old National tube bfo and i.f. coils - the
original schematic used crystals for each sideband frequency. Instead of
switching crystals,  I turn the bfo cap between two marks for usb/lsb
selection.  It works great and I use it all the time with my 390 which is
pretty standard otherwise.  You could adapt  the R392 bfo pto available from
Fair for the bfo as well if you wanted it to be "Collins" unit !!   I wasn't
interested in making any mod's within the receiver itself.  I believe there
are numberous tube mod's in the archives that take you in that direction.
Dan.

-----Original Message-----
From: r-390-bounces at mailman.qth.net [mailto:r-390-bounces at mailman.qth.net]
On Behalf Of PeterWittenberg
Sent: Monday, July 21, 2008 5:54 PM
To: r-390 at mailman.qth.net
Subject: [R-390] R-390 SSB Product Detector mods?? Not A

I am looking around for any modifications that have been done to add a SSB
product detector to the R-390, not the A version.

 

Anyone have any info??

 

-73- Peter K2LRC

www.k2lrc.com

 

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