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RE: LF: Cat Whiskers

To: <[email protected]>
Subject: RE: LF: Cat Whiskers
From: "James Cowburn" <[email protected]>
Date: Fri, 15 Jan 2010 22:22:22 -0000
In-reply-to: <[email protected]>
References: <[email protected]> <[email protected]>
Reply-to: [email protected]
Sender: [email protected]
Thread-index: AcqWKx0hSt5RWgmYQnGwSKHkYxaY3QAAshzwAADNcQA=
Amateurs using the washing machine???   Good god man....heresy!!!

With best regards
Dr. James Cowburn

-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Lee Hudson
Sent: 15 January 2010 22:14
To: [email protected]
Subject: RE: LF: Cat Whiskers

Hi John,

Markers were every 15 seconds.
Also the whole thing was repeated every 5kHz going up in frequency.

If if you look carefully the tips of the whiskers are connected.

My thought after reading Laurence's comment on variable freq drive for a
motor that it maybe the hydraulic compactors from the refuse site close by,
but I'm sure they're not that sophisticated.

But my favoured guess for something more common, is a washing machine on
spin cycle.
Don't all start washing please, HI!!


-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of John P-G
Sent: 15 January 2010 21:38
To: [email protected]
Subject: Re: LF: Cat Whiskers

On Fri, 15 Jan 2010 13:15:57 -0800 (PST)
M0FMT <[email protected]> wrote:

> Too glib
> I can visualise the whisker pointing in the direction of time but not 
> the mirror image how does that work.

Look like a carrier modulated by a harmonically rich waveform, which reduces
in frequency...... 

then after a time the carrier is modulated by a harmonically rich waveform
that now increases in frequency......

Not too difficult to imagine?

What's the time scale on the spectrogram?

A motor that slows down, stops and then speeds up?


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