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

[Larry Lopez]

Thank you Jim,
I read all your posts.

I'll quote your quote of K1JT again here:

    K1JT says that it is best to run the radio broadband and let the WSJT
    software provide the needed selectivity in its decoding algorithm. The
    reason is simple -- phase shift can cause decoding errors, filters in
    the radio create phase shift.

    73, Jim K9YC

But what about:

very weak signals reducing the bandwidth increases the signal to noise
ratio.
very strong signals reducing the bandwidth can prevent the DSP chain from
desensitizing the receiver and/or saturating the a/d converter.

Of course reducing the bandwidth tends to "phase shift can cause decoding
errors".

Which is why I'm asking if there are any constant group delay filters out
there.

Larry




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