All my text-book charts list Audio up to 20 kHz.. anything above that is
listed as RF.  :)

It's an artificial distiction if you ask me.  On any grounded linear amp
circuit I make, i can pick up 60 Hz 'RF' if i don't filter it well and am
working near my non-sheilded wall-wart power supply :)

-Aaron

> -----Original Message-----
> From: Jim
<<<snip>>>
> As to where RF begins - that's easy. Does it involve
> 'radio frequencies' and the technologies classically
> employed to modulate, amplify, detect, filter,
> demodulate or radiate EM energy as opposed to 'audio
> frequencies' which have in past decades normally
> 'modulated' an RF carrier in order to transmit
> intelligence though the ether from point A to point
> B?
>
> I'm afraid today's 'digi-head' has blurred all
> distinction between the two ...
>
> Jim
>

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