This comes from June 2013 QST page 59.
According to W7AY:
The ideal RTTY filter is 280 Hz wide. Narrowing it further by 60 Hz
doubles the error rate.
The article references:
http://www.w7ay.net/site/Technical/RTTY%20Transmit%20Filters/index.html
Which doesn't come out and say the above! It's talking about transmit
filters. W7AY doesn't like uneven power in transmit tones either.
Anyhow this may confirm what has been said on this reflector. The 350 Hz
(AKA 250 Hz) filter is probably the narrowest practical choice for RTTY.
73 de Brian/K3KO
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