[BC] AM Plate Modulation Concept

[Bailey, Scott]

I wished Continental still built SS, 1KW, AM boxes. They just seem to
have the best audio sound....at least in my ears.

-----Original Message-----
From: broadcast-bounces at radiolists.net
[mailto:broadcast-bounces at radiolists.net] On Behalf Of jvodenik
Sent: Tuesday, February 21, 2006 11:10 AM
To: 'Broadcasters' Mailing List'
Subject: RE: [BC] AM Plate Modulation Concept

We kinda sorta do that out here at Delano.  We run AM with a 6dB carrier
reduction.  Resting power is about 50 Kw, drives up to 250 Kw at 100%
modulation.  Maybe 'Ol Dave can explaign it..it's a Continental Solid
State Modulator system.  Looks just like SSB under modulation, if you
were to watch the plate volts and current.  Vary with modulation.
John @ VOA / Delano


If you're meaning that the average power of the carrier increases during

AM, that technique usually is called "controlled carrier" modulation.
The 
old Heathkit DX-35 used it, for example.  But that really isn't 
supermodulation, it is just ~100% modulation of the carrier power that 
exists at the instant of modulation -- and that carrier power is
controlled 
by the modulating waveform.

It does put more r-f in the sidebands (without excessive distortion)
than 
conventional AM of the same unmodulated carrier.  But the varying
average 
carrier value produces varying C/N ratio in the demodulated audio at the

receiver.

RF 



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