If crystal filters distort the phase enough to make an audible difference on
speech how the heck do we ever manage to receive PSK through them?
The phase distortion is most pronounced near the corner frequency of the
crystal filter.
PSK, at least PSK31, is a very narrow mode and the chang ein delay
(phase) through the filter over such a narrow bandwidth is usually
minor, as long as you don't operate at a corners.
73,
Lyle KK7P
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