[Amps] class "A" RF amp question
Joe Subich, W4TV
w4tv at subich.com
Wed Nov 8 15:37:48 EST 2006
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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