[R-390] SSB Converters

Mon, 13 Jan 2003 20:02:48 -0500

Fellow 390 Enthusiasts...
    The diode bridge is sold by Rick Mish, and it has been written about in
ER.  It is also shown on page 89 of Viappiani's book (in Italian) about the
390A.  If you don't have Viappiani's book, I recommend it.  It has A LOT of
good stuff.  Of course it IS in Italian, but most of the circuits are in
English.  And those that aren't, I've been able to figure out what is going
on.
    The heart of this SSB module is a traditional bridge circuit of 4 diodes
(probably
4148's).  The (+) lead goes to term. 16, the ground on the R-390A.  One AC
leg goes to terminal 13 of the line audio out.  The other AC leg has a 600
to 10K ohm resistor (just which value is chosen I don't know) in series with
it, between the AC leg and teminal 10 of the line audio out.  The (-) of the
bridge is connected to terminal 4 of the AGC.  All terminals are those found
on the back of the R-390A.
      I have a couple of these "modules" and have not found them to be any
improvement over just using standard settings for listening to SSB on a
R-390A.  I've recently acquired a CV-591A, and the one I have isn't that
much better either.     Of course, YMMV.
73's,
-tom


----- Original Message -----
From: Roy Morgan <[email protected]>
To: <[email protected]>; Scott, Barry (Clyde B) <[email protected]>;
R390 (E-mail) <[email protected]>
Sent: Monday, January 13, 2003 5:12 PM
Subject: RE: [R-390] SSB Converters


> At 11:01 PM 1/13/03 +0100, [email protected] wrote:
> >  in my personal opinion an R-390A/URR, proper aligned and
> >fitted with a diode bridge on the Diode Load on the rear terminal board,
> >don't need an SSB converter.
>
> Federico,
>
> Please tell us how a diode bridge on the Diode Load connector helps
receive
> SSB signals.
>
> I have not heard of this method.
> Thanks,
> Roy
>
>
> - Roy Morgan, K1LKY since 1959 - Keep 'em Glowing!
> 7130 Panorama Drive, Derwood MD 20855
> Home: 301-330-8828 Work: Voice: 301-975-3254,  Fax: 301-948-6213
> [email protected] --
>
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