On Sat, 12 Mar 2011, Piero Soldi wrote:

"Ralph Mowery" ha scritto nel messaggio
m...
The bandwidth will depend on what shift is being used. Some of the more
common shifts are 170,425, and 850 Hz.

The actual bandwidth needed to receive them will be slightly larger.
Something like 200 for the 170 Hz shift and 1200 for the 850 Hz shift.
The transmitted bandwidth will be larger yet.

It is similar to an FM signal, it theory it is infinite,but in practice it
can be much less.



"garyr" wrote in message
...
Anyone know what the bandwidth of a 50 baud RTTY signal might be?




Consider also the group delay of receiving filter...
with narrow Butterworth or Chebyshev crystal filters, group delay is big,
distorting
RTTY , CW or other digital signals, and ultimate result is error in
decoding.

So bandwidth need to be more than necessary. A Gaussian filter is better for
group delay,
but is worse for steepness.


I figured the original question was the bandwidth the signal took, rather
than the bandwidth of the receiver.

I didn't think anyone went for a receiver filter to match the RTTY signal.
Well maybe the hardcore RTTYers. But generally one used a reasonable
filter in the receiver, and counted on the audio filters in the
demodulator. There again, relative few decoded at the IF, but even then
the articles I've seen didn't go for any special narrow filters for RTTY.

Michael VE2BVW