[R-390] R-390A Cost Reduction and Improvements (was dead horse Hi)

[Gord Hayward]

Doing the coils shouldn't be too hard.  I rebuilt the AGC coil in my 
R390A using a slug tuned unit that
I found in my box of coils.  The trick was to use a big L and small C to 
get the Q that I needed.  It
took me two tries to get it right.  The first try gave a peak, but the Q 
was so low that it didn't give
enough gain to get a high enough AGC voltage.  The second try was dead 
on and the result meets
the specifications for the performance and the carrier meter calibration 
is good.  I think the IF strip
construction will be a pain.  To this end I've thought about trying (I 
know this is unrealistic :-) to get
an R390 IF deck and adapting it to the R390A .  How about an outboard 
R392 IF strip?

Solid state tubes are another can of worms that I've thought about. 
 Easier in an R-392!

Cheers, eh!
de Gord, VE3EOS

-- 

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