[Hallicrafters] Fw: I Need SSB Mod for Hallicrafters S-40A

[rbethman]

The drifting could well be reduced with the solution used in the SX-101s.
The "damp Chaser".  It not only reduced the "supposed" moisture, but
provided a constantly heated VFO/BFO that made drift insignificant.

Bob - N0DGN
----- Original Message -----
From: "Ian Webb" <ianwebb5 at attbi.com>
To: <hallicrafters at mailman.qth.net>
Sent: Tuesday, December 03, 2002 9:30 PM
Subject: Re: [Hallicrafters] Fw: I Need SSB Mod for Hallicrafters S-40A


> I pointed out to the poster in a private e-mail, unless you're doing
> this for the "fun of it" you're not going to create a receiver that is
> much fun to use on SSB.  I know from experience when the S-40B was still
> a popular receiver during the transition from AM to SSB that other than
> 40 meters and lower in frequency the drift is intolerable for
> comfortable SSB reception.
>
> I personally wouldn't bother doing anything but receiving SSB with the
> RF way down and the BFO on and AVC off.  The tuning rate and drift
> combine to make it a full time job to try to follow a SSB signal.  With
> CW the problem is the same but there at least you don't get a garbled
> voice just a CW note that is changing pitch constantly.
>
> Ian, K6SDE
>
>
> Glen Zook wrote:
>
> > There were some modifications that would work with the
> > S-40A in the first couple of editions of the ARRL SSB
> > manual.
> >
> > Frankly, it is probably easier to "tap off" of the 455
> > KHz i.f. and build a separate circuit that includes a
> > good filter.  The S-40A is "way" to wide for decent
> > SSB operation.
> >
> > Of course, you can use the old turn off the AVC, run
> > the audio gain wide open, and use the r.f. gain as the
> > volume control.  That does work fairly well.
> >
> > Glen, K9STH
> >
> > --- Andrisin <andrisin at verizon.net> wrote:
> >
> > I am looking for a SSB mod for the Hallicrafters
> > S-40A,eg product detector mod. Can anyone provide a
> > copy of this mod or refer me to a website that has
> > such a mod?
> >
> > =====
> > Glen, K9STH
> >
> > Web sites
> >
> > http://home.attbi.com/~k9sth
> > http://home.attbi.com/~zcomco
> >
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