[R-390] Fwd: R390a Navy no receive

[Don Reaves]

Welcome to the group, David.

The bell shaped device you describe on your Imperial sounds like the old
potted Radio Finder SSB "enhancer" module.  Here's a description from the
list archives ---

Date: Thu, 6 Nov 1997 21:19:04 -0800
From: Jim Haynes <haynes at ...>
Subject: [R-390] RE: usb/lsb Tune Aid
The thing from Radiofinder is not worth much. The basic idea is a bridge
rectifier connected
to the audio, and that is filtered and run into the AGC. You use the line
audio control to
control how much audio goes into it, and listen on the local audio. So it
gets you some audio dervied
AGC which is a good way to get AGC for SSB reception; and it knocks down the
RF gain some so that the BFO has a chance of demodulating the SSB signal
with less
distortion. But it doesn't work very well; the best thing that can be said
for it is that it
requires no internal mods to the receiver.
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Date: Fri, 7 Nov 1997 08:00:49 -0800
From: Reid Wheeler <reid at ...>
Subject: [R-390] SSB adapter
The recent thread concerning the Radio Finder SSB adapter is very
interesting but not new.
This device, in various forms and under various labels, has been around at
least since 1985
when venerable Hollow State Newsletter editor at that time, Dallas
Lankford, purchased one
and wrote a review - not favorable - in HSN #10. The most recent
re-appearance in HSN
was in #41 (Spring 1997) in an article by Reinhard Wieschoff-van Rijn who
purchased one
from an ad in ER. He boiled it down to dissolve the potting material and
found essentially
what has been described as a full-wave bridge rectifier (AC leads connected
across the line
output terminals on the rear terminal board - 10 and 13) and filtered (6
microfard-600V). A
schematic is included in the article. His conclusion - not very useful and
could be built with
junkbox parts or all new for a very few bucks.
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For troubleshooting audio problems it is probably best to remove that
gadget and adjust the receiver per the manuals.

Don



Don Reaves  W5OR WD2XSH/15