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.
Remember that with all digital modes, the SSBC parameter should be set
to 1:1 for the lowest IMD and that RTTY FL1 must be set to OP1 (or OP2,
3, 4 or 5 - they are the same). Adjust the RTTY FL1 BFO to be the same
as those for SSB and all will be well on transmission.
73,
Don W3FPR
Dohn wrote:
If one centers their filters at 2210 Hz in RTTY mode for use in RTTY, then
is RTTY no longer the mode of choice for PSK31? Would you just use USB for
PSK31 and adjust your speech compression? Are RTTY and PSK31 both useable
with RTTY mode with filters centered around 2210 Hz?
Dohn N8EWY
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Steven Pituch
Sent: Saturday, March 17, 2007 5:29 PM
To: Elecraft
Subject: Re: [Elecraft] RTTY Problems
(The crystal filters in RTTY mode are unusable for
RTTY because they're centred on voice audio
frequencies and not RTTY freqs. But that's another
story.)
Hi Ken,
As far as the other story goes....center them on 2210 Hz or whatever the
RTTY center frequency is, then narrow them down to about 400 hz wide and
then it will work fabulously. My PK232 is centered on 2210 Hz so I aligned
the K2 filters to match. Now I can do PACTOR I with my K2.
See:
http://www.pituch.net/p/Steve's%20Page/Radio/RTTY/RTTY.html
or just page down from www.pituch.net
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