[GreenKeys] TU question about CV-89A/URA-8A

[Jim Haynes]

There should not be any problem using the too-wide discriminator.  The
important thing is to have narrow enough bandwidth ahead of the limiter
to exclude as much non-signal as possible.  It's important that the
discriminator be quite a bit wider than the signal you are trying
to receive.

See Don Wiggins W4EHU "Interference Characteristics of FSK Systems"
in RTTY, November 1960, p. 3.