[Elecraft] RTTY FILter

[wa9fvp]

The butterfly filters are tuned exactly to the tone frequency.  When the
cross pattern is vertical, it's spot on 2125Hz, horizontal is exactly
2295Hz.  I changed the DATA Mode to AFSK using a single filter and that
works the best.  I found that the width control is optimized between 500 and
450 Hz.   Less than 450, the non-coherent phase shifts are introduced, as
you mentioned "is caused by filter ringing".

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Jack WA9FVP
Willco Electronics
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