[Elecraft] RTTY Problems

[Ken Alexander]

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 <w3fpr at earthlink.net> 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.