> Correct. Instead of "flat audio", a term such as "unshaped",
> "unprocessed"
> and/or "direct FM" should be used instead.
>
> Bob NO6B
Right.
An FM discriminator is always "flat" - the discriminator doesn't do anything
to alter the frequency response. It's only purpose is to recover the audio;
later AF stages alter the response.
Audio: can be preemphasized or not preemphasized. There should be no such
term as "flat audio" - that's where all the confusion comes from as it can
mean either preemphasized audio or deemphasized audio depending on
where/when the term is used.
All repeaters end up yielding "flat" response from end to end. It's just a
matter of whether not there is reciprocol deemphasis-preemphasis within the
repeater cabinet (intentional or unavoidable frequency response aberrations
notwithstanding).
--- Jeff
