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[AMPS] Two-tone audio generator for testing IMD?

To: <amps@contesting.com>
Subject: [AMPS] Two-tone audio generator for testing IMD?
From: 2@vc.net (2)
Date: Mon, 17 Dec 2001 07:40:08 -0800
>
>> If I can measure the baseline (the exciter) first, the additional IMD
>> generated in the amp shows up as an increase from that baseline.
>> Subtract the baseline and I have a number that represents the amps
>> distortion. 
>
>Distortion is phase coherent. Because of phase and level 
>differences through a system where each stage adds distortion, 
>distortion can add, subtract or do anything in between. Measuring 
>white noise is much different than measuring distortion.
>
>This is the same mistake an amplifier manufacturer made when he 
>said he was going to patent an input circuit that "cleaned up 
>exciters". He used a broadband toroid, which added distortion that 
>just happened by dumb luck to correct distortion from the exciter 
>he was using. Put it on a different exciter, and it could just as 
>easily add IM distortion!
>... ... ...
//   Which manufacturer invented the exciter cleaner upper?  Was a patent 
granted?
tnx, Mr. Rauch

-  R. L. Measures, 805.386.3734,AG6K, www.vcnet.com/measures.  
end


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