[R-390] RE: Slaving R-30s again

Mon, 22 Sep 2003 07:51:45 -0400

Jack, the experiment sounds neat.

I run the IF from my 390A into two product detectors fed with a local 
oscillator with two phase shift
networks at +/- 45 degrees, thus the outputs are 0 and 90 degrees from 
an arbitrary reference.  These
go to right and left headphones and the effect on SSB is spectacular. 
Noise goes from a hiss to a
panoramic waterfall while the station stays put in front of me.  The 
noise is almost pleasant to listen to.
There's more on this on the amfone.net website in terms of a synchronous 
detector which can be
adapted to quadrature detection.  I'm designing a quadrature ISB 
detector for AM which might be
interesting, but mostly because its a neat idea to play with.

Since the 390 is triple conversion on the lower bands, you would need to 
have all 3 oscillators fed from
the master receiver and as Cecil mentioned the mech filters are possibly 
a problem, but if they are the
same (gross assumption here) then they would add a common phase shift to 
both and thus cancel as I
guess its the phase difference you're after.

73 de Gord, VE3EOS.

-- 

Gordon L. Hayward, Ph.D., P.Eng.,
Associate Professor, Biological Engineering,
School of Engineering, University of Guelph,
Guelph, Ontaro, N1G 2W1.