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[Amps] ALPHA 77

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Subject: [Amps] ALPHA 77
From: (2)
Date: Mon, 5 Aug 2002 07:42:31 -0700
>> >When I tune an 8877 amp, I
>> tune everything for maximum power out.
>> >I then tweak the PA loading
>> cap slightly to give a
>> needle-width decrease
>> >on the wattmeter. I need to
>> see the grid current at this
>> time to make sure
>> >it goes down and not up when
>> making this adjustment. This
>> slight reduction
>> >in suds makes a nice
>> increase in clean.
>> True, Phil, but the 8877 is
>> so clean that there are no
>> transceivers even
>> in the same league.
>This "clean" isn't limited to the IMD
>performance of the amp.  Harmonics/spurs
>are also reduced by this slight antenna
>overloading, usually by 5-15dbm.
**  Heavier loading means less load-C.  Are you saying that less load C 
shunting the output reduces harmonics?

-  R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K,  

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