Ken,
MMTTY allows you to select 915 for the mark frequency. If your K2 RTTY
filters are centered at 1000 Hz, that is a better choice than 1275 Hz.
Those you transmit to will not know the difference, and you can
communicate with anyone using the same shift (170 Hz). The software
compensates automatically.
73,
Don W3FPR
Ken Alexander wrote:
I'm all for anything that keeps me from fiddling with
the K2's filter setup! The thought of playing with
them makes me squeamish.
I just downloaded MMTTY and installed it on my
computer at the office and now see where I can change
the mark freq to 1275 Hz.
I know I should be embarassed for asking this, but:
If I'm generating tones at 1275 and 170 Hz shift and
somebody who's software is set up for 2125 & 170 Hz
tunes me in, he'll centre me in his display and decode
me fine. But if he transmits with his setup won't I
have to re-tune to decode him properly?
Ohhh...I know I'm going to regret this, but it's
Monday and I'm not firing on all cylinders yet!
73,
Ken Alexander, VE3HLS
--- Don Wilhelm <[EMAIL PROTECTED]> wrote:
Dohn,
You can always tune the PSK31 signal with the K2 VFO
so the audio will
appear near 2210 Hz rather than the more traditional
1000 Hz. But many
RTTY software packages offer another alternative -
adjust the RTTY tones
in the RTTY software.
I believe the better way is to tell the RTTY
software to use lower tones
rather than the traditional 2210 Hz center. Of
course that cannot be
done if one is using a hardware TU which does not
implement a switch for
low tones. The traditional "Low Tones" for RTTY is
1275 mark and 1445
space - only the shift amount is critical. If you
have your PSK31
filters set for 1000 Hz center and you can tell the
RTTY software to use
915 Hz mark and 1085 space tones both RTTY and
PSK31 signals can be
received with the narrow RTTY filters at a 1000 Hz
center.
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