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

To: amps@contesting.com
Subject: Re: [Amps] MOSFET amp filtering - was: auto-tune
From: Jim Brown <jim@audiosystemsgroup.com>
Reply-to: jim@audiosystemsgroup.com
Date: Mon, 12 Dec 2016 17:37:41 -0800
List-post: <amps@contesting.com">mailto:amps@contesting.com>
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


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