[Elecraft] KPA500 active devices!!

[Tom W8JI]

It's pretty basic stuff Guy.

Look at what happens in this MRF150:

http://www.w8ji.com/demonstation.htm

It would be nice if there was a free lunch and we could 
magically buy a device that didn't care about the load and 
gave reasonable operating efficiency and good IMD with any 
impedance from perfect to a 3:1 mismatch, but it isn't 
possible. Not blowing up in a few seconds on a data sheet 
test circuit is a whole lot different than being acceptable 
to operate that way in the real world.

73 Tom


<<<<<
Device web site was claiming "any angle" in the device 
specs.
(!!!???)  This should be fun to watch.

73, Guy.

On Sun, Apr 18, 2010 at 9:54 AM, Matt Palmer 
<kd8dao at gmail.com> wrote:
> Well said tom, an often overlooked aspect is the angle of 
> the
> mismatch, load pull is the only way to tell, while a 3:1 
> resitive is
> not to harsh, very few things will survive a 3:1 at an 
> inductive
> reactance angle. Load pull is the only way to be sure, and 
> I would be
> uncomfortable making any claims until such a test has been 
> done.
>
>
> Matt
> W8ESE
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