[Boatanchors] AM linear question

[Rob Atkinson]

It's important to remember that what I do applies to my amplifier and
its output pi network, which is probably a Q compromise to cover 160
to 10 meters.  Every RF linear amplifier with a pi output network may
not behave the same way.  I have tuned the amp to achieve 1200 or more
watts output with 80 to 100 watts CW drive, and the tune capacitor
position is the same is it is if I drive it with 20 watts.   With
modulation the loading is adjusted to provide a trapezoid showing
linearity.   But from my experience, once you get a medium or high
powered plate modulated rig on the air and seen Paris, you can't be
kept on the farm, hi.

73

Rob
K5UJ

On Thu, Dec 10, 2015 at 12:12 PM, Dennis DuVall <duvallddennis at gmail.com> wrote:
> Rob,
>
> Interesting…  I’ve always just adjusted the linear tuning and loading for max output at the AM peak value with excellent results (very conservatively built HB 3-1000Z amp).  Nice flat sides on your trapezoid pattern makes sense.  Would be curious to know, though, the difference, if any, in linear tuning and loading control settings arrived at by that technique vs. those found by adjusting for max output at the peak value only.  Put another way, would adjustment for max output at the peak value mess up the shape of your trapezoid?
>
> Dennis D.  W7QHO
> Glendale, CA
>