>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 AØ 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,
? agreed. I would assuredly not be looking for IMD with 100w of A-Ø
signal.
>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.
>
? agreed. Who brought up intermodulation distortion?
>
- later, Tom
Rich...
R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures
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