[R-390] SSB adapter

[Tisha Hayes]

I think that audio quality on almost every piece of repurposed military gear
is going to be deficient when it comes to leisurely listening. Either it
ends up being the limitations of the components stuck in the audio amplifier
chain or a bandwidth/ linearity issue in the IF.

We have a little of both.

In each of my receivers someone had been at them with a magic screwdriver
before me and took the stagger tuned IF and dialed them all down to 455.0
KHz. It made for real good IF selectivity (a bit too good) as the audio
recovery chopped off the high frequency response. Then there is the typical
"old cap" issue and while you are in there, making a few value changes to
open up the low and high frequency response.

Many folks are mystified by the 600 ohm audio output as well.

I have not screwed around with the Cv-591A audio circuit. Then again, SSB is
not something I want blasting through the house either.

I have ceased to use the R-390A as my amateur radio receiver and it is used
more for weak signal utility monitoring and SWL listening. Much of the
utility monitoring is USB (maritime, aviation, military, etc..).

For fun, BCB I still use the SP-600, I guess the only way to beat that audio
quality would be to get another Telefunken console radio.

Since this thread has started I have been mentally reviewing my use of the
CV-591A and wondering if there may be a better way to go. (A.K.A. Sherwood
SE-3) as it would add synchronous detection for BCB/ AM. I like PLL circuits
ever since I built a SCA decoder back in high school.

-- 
Ms. Tisha Hayes/ AA4HA
-
*"Learning is not virtue but the means to bring us an acquaintance with it.
Integrity without knowledge is weak and useless, and knowledge without
integrity is dangerous and dreadful. Let these be your motives to action
through life, the relief of the distressed, the detection of frauds, the
defeat of oppression, and diffusion of happiness."  -- Nathanael Greene*