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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