AVT for RTTY?
08-Nov-90 02:27:22
Sb: #5537-AVT for RTTY?
Fm: Black Belt Systems 76004,1771
To: Nick Moore 75236,3036
No, you're not overlooking anything major. Here are some issues to
consider, though:
Most RTTY demodulators have pretty extensive filtering before the
demodulator. It helps them "see" the RTTY signal regardless of CW and
QRN/QRM near (even very near) the signal.
The AVT has to "see" FSK input from 1000 hz to 2300 hz with no breaks. So,
it's got no filtering. This means that it would be subject to rather severe
noise interference.
Finally, I think we'd have to write a RTTY mode into the demodulator,
because it's doing some really weird things to the incoming audio to hadle
wide-band signals somewhat better. It could probably *do* RTTY now, but it
might screw up at 110 baud ASCII due to the signal munging it does.
Otherwise, sure. :^)
BBS->Williams.Ben[AA7AS]