[GreenKeys] FSK shifts

[Nick England]

Thanks to greenkeyers for a copy. Basically this tech note says that wide
shift (plus auto threshold) will give you the benefit of frequency
diversity during differential fading between mark and space. So if you are
having trouble with 170 shift due to both M and S fading at the same time,
try 850 shift.

Side note - in VFCT systems where many TTY signals are compressed into a
voice channel (85 Hz shift with 170 Hz spacing), two TTY channels at the
higher and lower voice frequencies are "twinned" for freq diversity (or 4
channels for quad diversity).
https://www.navy-radio.com/rtty-mux-ucc1.htm

Nick England K4NYW
www.navy-radio.com


On Tue, Aug 24, 2021 at 4:00 PM Nick England <navy.radio at gmail.com> wrote:

> "A Case for Wide-Shift RTTY" sounds interesting - but I dropped out of the
> ARRL some years ago.
> Can anyone send a scan?
> Thanks.
> Nick England K4NYW
> www.navy-radio.com
>
>
> On Tue, Aug 24, 2021 at 3:33 PM Jim Haynes <jhhaynes at earthlink.net> wrote:
> >
> >
> > You'll want to read the article by K6STI in the April 1996 issue of
> > QST, pages 78-79
> >
> >         ---
> >
> >         "Ya can argue all ya wanna, but it's dif'rent than it was."
> >         "No it ain't! No it ain't!  But ya gotta know the territory."
> >                 Meredith Willson, The Music Man
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