[RTTY] Signals that don't decode

[David G3YYD]

I found during the CWWPXRTTY contest at the weekend that there were some
signals with so much jitter on them that would not decode at all. They all
sounded very similar with similar shaped spectrums. I am wondering if there
is some software and in this case maybe it is radio firmware rather than a
general purpose computer software that is generating this signal.
 
I had one guy who kept calling me fortunately he was weak so I just kept on
running and copying others. 
 
Does anyone know what this might be? Better still if someone has a sound
file of the TX being received then I would love a copy of that sound file to
have a look at.
 
Thank you for those who gave me a Q and hopefully a new prefix at the same
time. 
 
73 David G3YYD aka M7T in contests