[Elecraft] K3 vs. HPSDR Mercury receiver

[Lyle Johnson]

> 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