[Amps] class "A" RF amp question

[Joe Subich, W4TV]

Ken, 

> *******Would 3000 watts dissipation apply both to a 1500 watt 
> PEP SSB signal and a 1500 watt PEP AM signal?

Yes.

In a class A amplifier the plate dissipation is maximum at zero power 
output.  At zero output, the plate must dissipate 100% of the input 
power.  At maximum output (1500 watts peak), the plate must dissipate 
only the "loss" power - in this case 1500 watts.  At all points in 
between the power dissipated in the plate will vary between 1500 and 
3000 watts (with a minor deduction for the power actually lost in 
the output network).  

73, 

   ... Joe, W4TV 
 





> -----Original Message-----
> From: amps-bounces at contesting.com 
> [mailto:amps-bounces at contesting.com] On Behalf Of kenw2dtc
> Sent: Wednesday, November 08, 2006 3:12 PM
> To: Robert B. Bonner; amps at contesting.com
> Subject: Re: [Amps] class "A" RF amp question
> 
> 
> Bob said:
> 
> "If you say 50% efficiency in a class A (people can argue 
> either side of 
> this) You would need to heat up the shack with 3000 watts"
> 
> *******Would 3000 watts dissipation apply both to a 1500 watt 
> PEP SSB signal and a 1500 watt PEP AM signal?
> 
> 73,
> Ken W2DTC 
> 
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