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Re: [Amps] Checking for IMD

To: Tom W8JI <w8ji@w8ji.com>, amps@contesting.com
Subject: Re: [Amps] Checking for IMD
From: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Reply-to: g3rzp@g3rzp.wanadoo.co.uk
Date: Sun, 13 Aug 2006 08:54:59 +0200 (CEST)
List-post: <mailto:amps@contesting.com>
Tom said:
>Average makes no sense to me, since a receiver S meter is 
not an averaging measurement device.

I would add a correction that the level is not the average, 
but rather the peak power contained in the filter bandwidth.< 
Additionally, all too often, the 'S' in 'S meter' stands for 'suspicious. The 
resolution isn't going to be any too good, either, and as Tom says, it doesn't 
give an average value.
Another approach might be to use an AF power meter with an average detector (I 
have a feeling that this is maybe a VU meter?), switch the AGC off, and use the 
attenuator to adjust the levels to some reference level.
Of course, there's a further approach - that I heard many years ago - 'I can't 
be splattering, I'm using a Collins transceiver!' Co-incidental, of course, but 
that particular guy got 4 years in prison for running a fraudulent motor 
insurance company...........he's dead now.

73
Peter G3RZP
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