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Subject: [AMPS] IMD
From: Ian White, G3SEK" < (Ian White, G3SEK)
Date: Thu, 20 Sep 2001 10:32:01 +0100
Peter Chadwick wrote:
>Tom says:
>>Are you saying the wideband noise causes the power supplies to 
>>waddle around at a syllabic rate?
>It had better, even if it means modifying the noise source.

It's true in principle that white noise contains equal components at all
frequencies, but it doesn't contain the very strong components at
syllabic rates that speech does.

The frequency spectrum of speech looks like a huge peak at about 1-5Hz
(higher for auctioneers) but then virtually nothing until about 200Hz.
It's the strength of that syllabic-rate peak that troubles so many power

73 from Ian G3SEK          Editor, 'The VHF/UHF DX Book'
                          'In Practice' columnist for RadCom (RSGB)

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