Re: [Amps] Centurion cooling improvement ideas for AM service

["Paul Christensen" <w9ac@arrl.net>]

> The "carrier" that you hear on these signals is probably not carrier but
> inband IM products from the low frequency audio signals. Listen closely
> and you will see that it is only present with modulation.

It is not IM.  An excellent discussion concerning the effect you're hearing
is well-documented on the NU9N web site.  As audio approaches the carrier
set point in the lower audio octaves, to the ear it sounds like the presence
of a carrier, but disappears as you tune on-frequency.  Somehow, all
unexplained things only in the presence of modulation tend to be blamed on
IM.

-Paul

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