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Here's one caught when I ran the 500 kHz grabber
in spring 2008. I believe Laurence's explanation is correct. During
acceleration of the motor, the dutycycle on the constant chopper frequency
is being modulated with an increasing rotation frequency, and its
harmonics.
73 de Markus, DF6NM
----- Original Message -----
Sent: Friday, January 15, 2010 1:54
PM
Subject: RE: LF: Cat Whiskers
Looks like variable frequency drive interference from
devices like pumps, elevator motors, cranes etc. Very musical
if listening on SSB and strong enough.
Laurence KL 1
X/5
From: [email protected]
To:
[email protected]
Date:
Fri, 15 Jan 2010 12:40:01 +0000
Subject: LF: Cat Whiskers
Hi
All,
Anyone come
across these?
I have seen
them on 80m too in the past.
73,
Lee
M0LMH.
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