[AMPS] Re: Ferrite Rod for 6M Amp

[Tom Rauch]

Subject:        	Re: [AMPS] Re: Ferrite Rod for 6M Amp
Date sent:      	Thu, 27 May 1999 13:35:20 -0700
From:           	Rich Measures <measures@vc.net>
To:             	<W8JI@contesting.com>, "Amps Reflector" <amps@contesting.com>

> 
> 
> hello, Tom
> >
> >While I agree an air core alone is sufficient to make a reasonable 
> >filament choke on 50 MHz, Rich has a total misunderstanding of 
> >what creates "distortion" that we can hear in a linear PA.
> >
> It was not a SSB signal.  It was an AŘ signal of 100w.  The type-61 
> material performed well at 10MHz.  The waveform looked good.  I slowly
> increased freq.  At 14MHz, the waveform did not look good. .   However,
> with a ferrite material rated for 50MHz max. instead of 10MHz max., no
> distortion was observed at 14MHz.  

Distortion on the slope of a sinewave has nothing at all to do with 
undesired IMD, assuming your observations are true (which I do not 
believe they were).

The correct test for non-linearity and intermodulation distortion is to 
measure envelope distortion on a modulated signal.

You "observed" nothing that means anything for IMD.




73, Tom W8JI
w8ji@contesting.com

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