[Amps] MOSFET amp filtering - was: auto-tune

[Jim Brown]

On Mon,12/12/2016 2:18 PM, Manfred Mornhinweg wrote:
> But is it in an RF amplifier?  Really?

Spend a bit of time on any ham band with a spectrum analyzer that has 
good frequency resolution and you'll learn in the first 30 minutes that 
this is true.

Or take a look at pictures from mine looking at CW and SSB signals. 
http://k9yc.com/P3_Spectrum_Measurements.pdf

Or Fig 1 on page 3 of http://k9yc.com/ContestAudio.pdf

Or set up a 2-Tone IMD test using whatever generators you happen to have 
in your lab. The Elecraft K3 has one built-in. See K6XX's test results 
here. http://k9yc.com/K6XXAmpTalk.pdf

The splatter MUST be created in the power amp -- AF harmonics outside 
the SSB filter will be suppressed by that filter.

73, Jim K9YC