Return-Path: Received: from mtain-dh11.r1000.mx.aol.com (mtain-dh11.r1000.mx.aol.com [172.29.65.31]) by air-mb05.mail.aol.com (v126.13) with ESMTP id MAILINMB051-a3834b51101531f; Fri, 15 Jan 2010 20:02:13 -0500 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-dh11.r1000.mx.aol.com (Internet Inbound) with ESMTP id EA9B538000100; Fri, 15 Jan 2010 20:02:11 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1NVx2A-0002PD-NA for rs_out_1@blacksheep.org; Sat, 16 Jan 2010 01:00:58 +0000 Received: from [83.244.159.144] (helo=relay3.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1NVx2A-0002P4-0l for rsgb_lf_group@blacksheep.org; Sat, 16 Jan 2010 01:00:58 +0000 Received: from web28106.mail.ukl.yahoo.com ([217.146.182.126]) by relay3.thorcom.net with smtp (Exim 4.63) (envelope-from ) id 1NVx29-00050j-Te for rsgb_lf_group@blacksheep.org; Sat, 16 Jan 2010 01:00:57 +0000 Received: (qmail 57499 invoked by uid 60001); 16 Jan 2010 01:00:52 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoo.co.uk; s=s1024; t=1263603652; bh=9mqnuxAD/7JMB3TtZ92ICOAQwvPjO69y9xgCL5ukyNA=; h=Message-ID:X-YMail-OSG:Received:X-Mailer:Date:From:Subject:To:In-Reply-To:MIME-Version:Content-Type; b=pYjsTnFT7nGTgLc6sxIrw/4CArcOSWLFaJq5f+mxu8WFx+pvSBxq0CoV5KSm3ofSanT0ptztRjSy4/ewSDfJHMMuL/VBQTH5VgvwwclBTsOx9gzbMNE0cAtSCXFIm/jCBa43vXxet1MctTtycQ0kF/0j5BXglYDrSGJurWs8HZg= DomainKey-Signature:a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.co.uk; h=Message-ID:X-YMail-OSG:Received:X-Mailer:Date:From:Subject:To:In-Reply-To:MIME-Version:Content-Type; b=mTHqBfS2KRx8yjAKhb2HEkISux73+HezIRV0mqI2UeSjdXm9NTKJ1orY8sEw8DA37tf7lIQdKhfQGOfkdygDY2EePrlMdxMQgqiopW3n1N7yh6KDN+pOvqGVYFZIzZ7a/AC48WbWWvieyu21plIugsDmPMtJkwpImvDWYA9pRDg=; Message-ID: <467468.55676.qm@web28106.mail.ukl.yahoo.com> X-YMail-OSG: WeEswG8VM1krb9BzA7oC_i3e3UmVRFqH7eI4GTRmg2d9uBB2FGbhTfcTg21X.3QOy43N6RAZy1O9md665r_6M5RemT40MlrHXo2OQohGCRKKNoDcvgDZLkZyx9GFU6B.AEpFaoG2VKH25ZHBW9GAHg103mXvGcujqcXZn4BRRdCfrw28J4ooWnWqtzVEEMCOgV6kMnjtMp6GyZcJy6pOOIy_iQwCklM12rSujkPo8WTeQWOk71K.sw1KgVBmcKY5KOk5Jh1Lv1zk4iSAeMpWJBQ- Received: from [86.149.156.87] by web28106.mail.ukl.yahoo.com via HTTP; Fri, 15 Jan 2010 17:00:52 PST X-Mailer: YahooMailClassic/9.1.10 YahooMailWebService/0.8.100.260964 Date: Fri, 15 Jan 2010 17:00:52 -0800 (PST) From: M0FMT To: rsgb_lf_group@blacksheep.org In-Reply-To: <20100115213758.2427e447@opc1> MIME-Version: 1.0 DomainKey-Status: good (testing) Subject: Re: LF: Cat Whiskers Content-Type: multipart/alternative; boundary="0-1591775188-1263603652=:55676" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.0 required=5.0 tests=HTML_MESSAGE autolearn=no version=2.63 X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false x-aol-global-disposition: G x-aol-sid: 3039ac1d411f4b5110135222 X-AOL-IP: 193.82.116.20 --0-1591775188-1263603652=:55676 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable OOOK I'll buy that.=20 =A0 Lee points out the faint joining lines of constant frequency during period= between expansion and contraction of the side bands. Indicating multi-fre= quency (harmonic) modulation at constant amplitude then ramped to "off" an= d on "startup" the oppsite happens. OK OK. Some kind of motor control then= . Right.....=A0OK then .............. teach me to ask a silly question! =A0 The signal appears pulsed, I guess that accounts for the harmonic modulati= on content? =A0 Thanks for the explanation. 73 es GL petefmt --- On Fri, 15/1/10, John P-G wrote: From: John P-G Subject: Re: LF: Cat Whiskers To: rsgb_lf_group@blacksheep.org Date: Friday, 15 January, 2010, 21:37 On Fri, 15 Jan 2010 13:15:57 -0800 (PST) M0FMT wrote: > Too glib > =A0 > I can visualise the whisker pointing in the direction of time but not > the mirror image how does that work.=20 Look like a carrier modulated by a harmonically rich waveform, which reduces in frequency......=20 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? J =20 --0-1591775188-1263603652=:55676 Content-Type: text/html; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable
OOOK I'll buy that.
 
Lee points out the faint joining lines of constant frequency during= period between expansion and contraction of the side bands. Indicating mu= lti-frequency (harmonic) modulation at constant amplitude then ramped to= "off" and on "startup" the oppsite happens. OK OK. Some kind of motor con= trol then.
Right..... OK then .............. teach me to ask a silly questi= on!
 
The signal appears pulsed, I guess that accounts for the harmonic mod= ulation content?
 
Thanks for the explanation.
73 es GL petefmt

--- On Fri,= 15/1/10, John P-G <gm4slv@sighthound.demon.co.uk> wrote:=

From: John P-G <gm4slv@sighthound.demon.co.= uk>
Subject: Re: LF: Cat Whiskers
To: rsgb_lf_group@blacksheep.or= g
Date: Friday, 15 January, 2010, 21:37

On Fri, 15 Jan 2010 13:15:57 -0800 (PST)
M0FMT= <m0fmt@yahoo.co.uk> wro= te:

> Too glib
>  
> I can visualise the whiske= r 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 do= wn, stops and then speeds up?


J


<= /td>

=20 --0-1591775188-1263603652=:55676--