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Subject: [AMPS] 4-1000 IDLING CURRENT
From: (Ian White, G3SEK)
Date: Mon, 30 Mar 1998 22:39:30 +0100
Jon Ogden wrote:
>>In linear operation there has to be a compromise between output power and
>Unfortunately this seems to always be the case!  Except you forgot 
>efficiency.  One can have poor efficiency, good output power and good IM 
>(class A).  

Class A gives poor efficiency and good IMD, but poor output power
compared with the same tube operated in class AB1 or AB2.

I tend to downplay efficiency, because a "linear" amplifier adjusted for
efficiency is usually a menace on the air. If you want to put out a big
signal with good IMD, you have to be willing to pay whatever the
electricity bill comes to.

73 from Ian G3SEK          Editor, 'The VHF/UHF DX Book'
                          'In Practice' columnist for RadCom (RSGB)

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