[Amps] IMD

[Fuqua, Bill L]

From: amps-bounces at contesting.com [amps-bounces at contesting.com] On Behalf Of Ron Youvan [ka4inm at tampabay.rr.com]
Sent: Sunday, January 08, 2012 9:35 AM
To: amps
Subject: Re: [Amps] IMD


   This "different delay for different frequencies" is called "group delay."
It is something that messes up dial up modems.  (so you don't get 56 kB/s)
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  Constant delay at all frequencis is also referred to as " linear phase response". That is if all frequencies 
have the same delay then the phase shift is linear.  1kHz phase output relative to input could
be -30 degrees but 2kHz would be -60 degrees and so on. but only if the delay is uniform across all
frequencies.
73
Bill wa4lav