[Amps] Class A for AM

[Gary Schafer]

> -----Original Message-----
> From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com] On
> Behalf Of Jim Tonne
> Sent: Tuesday, November 14, 2006 9:00 PM
> To: Gary Schafer; 'KA5MIR'; amps at contesting.com
> Subject: Re: [Amps] Class A for AM
> 
> 
> > . . . the dissipation would be 6000 watts minus power
> >  out for any given output power.
> 
> I have to share with you guys a comment from a fellow
> at a major broadcast equipment manufacturer (located
> in Dallas, Texas).
> 
> We were chatting about a circa 1970 screen-modulated
> AM rig.  Those things are also "efficiency-modulated"
> and so operate at about the same efficiency as a pure
> linear amplifier.  We were talking about a 10 kW
> carrier output AM rig.
> 
> He made the interesting statement that "to keep the thing
> cool you either modulate hell out of it or shut it off",
> which statement I found fascinating!
> 
> - JimT

Hi Jim,

True enough! The more power you take out the higher the efficiency and the
less plate dissipation.

73
Gary  K4FMX