[Amps] class "A" RF amp question

Gary Schafer garyschafer at comcast.net
Wed Nov 8 17:57:35 EST 2006



> -----Original Message-----
> From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com] On
> Behalf Of kenw2dtc
> Sent: Wednesday, November 08, 2006 12:41 PM
> To: amps at contesting.com
> Subject: [Amps] class "A" RF amp question
> 
> 
> If one were to build a class "A" RF tube amplifier capable of producing an
> AM signal of 375 watts carrier and 1500 watts PEP, what would be the plate
> dissipation required by the tube?  (I know how stupid and inefficient this
> is, but I really would like an answer).
> 
> As background, I have an AL-1200 (3CX1200A7) which starts to flattop
> beyond
> 375 watts of carrier at 100% modulation and this amp is class "AB2", so I
> know class "A" would require significantly more dissipation than 1200
> watts.
> 
> 73,
> Ken W2DTC

If you increased the carrier out to say 400 watts then the amplifier would
have to be tuned to 1600 watts PEP in order to handle 100% modulation.

73
Gary  K4FMX




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