[Elecraft] What crystal filters for the K3 are linear phase delay (constant group delay) ?

[Larry Lopez]

And just for the record.

If you are going to optimize for bandpass shape
then you are going to have non constant group delay.

If you add more crystals you can have both and the
filters would be more expensive.

It's a compromise and we demand this compromise.

A phase linear filter looks bloody awful in terms
of bandpass shape.  No sharp sides.

But these days the DSP can provide some of the
attenuation so perhaps a compromise can be made.

Which is why I like the 2.7 KHz 5 pole filter.




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