[Boatanchors] AM linear question

[Dennis DuVall]

Rob,

Pi network in my HB as well & 160 through 10M coverage. BIG plate xformer and copious air supply too.  Do most of my AM work with a T-368 though.

73,

Dennis D.  W7QHO

*********
> On Dec 10, 2015, at 7:26 PM, Rob Atkinson <ranchorobbo at gmail.com> wrote:
> 
> 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
>>