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LF: Re: Aliens on LF !

To: <[email protected]>
Subject: LF: Re: Aliens on LF !
From: "James Moritz" <[email protected]>
Date: Mon, 27 Sep 2010 21:00:10 +0100
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Dear Gerhard, LF Group,


Has anybody an explanation for the kind of signals displayed on my
grabber sometimes?


I think quite a few people have seen signals like this - one possibility is switch-mode variable speed drives for AC 3-phase induction motors. The RF is centred on some harmonic of the switching frequency, the spacing of the sidebands depends on the motor speed (i.e. the output frequency of the inverter) ... it would seem quite low in your case.

Cheers, Jim Moritz
73 de M0BMU


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