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[AMPS] Distortion Measurement Distortion

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Subject: [AMPS] Distortion Measurement Distortion
From: (Tom Rauch)
Date: Thu, 20 Sep 2001 05:32:10 -0400
> It's now possible to call up a digitized speech signal which is always
> the same, and to measure spectrum occupancy with the analyzer in 'peak
> hold' mode. If you set up each rig according to the manufacturer's
> instructions, and continue to loop the test signal until the spectrum
> ceases to 'grow' at any point, the display then shows the highest
> levels that the sideband signals have ever reached, at any moment.
> Compared to a two-tone test, the result look horrifying - usually a
> straight-sided 'pyramid' of solid IMD!

For commercial equipment testing I have to use multiple sweep 

The TS-2000 looks like inverted dinner plate instead of a pyramid. I 
take it as a sign the engineer who was supposed to look at 
bandwidth and decide it was OK was out-to-lunch.
73, Tom W8JI 

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