Return-Path: Received: from mtain-da08.r1000.mx.aol.com (mtain-da08.r1000.mx.aol.com [172.29.64.80]) by air-me01.mail.aol.com (v129.4) with ESMTP id MAILINME014-8ba34d3c7011170; Sun, 23 Jan 2011 13:14:41 -0500 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-da08.r1000.mx.aol.com (Internet Inbound) with ESMTP id 50E1F3800009A; Sun, 23 Jan 2011 13:14:40 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Ph4Ra-0004Kp-9g for rs_out_1@blacksheep.org; Sun, 23 Jan 2011 18:13:42 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Ph4RZ-0004Kg-Rc for rsgb_lf_group@blacksheep.org; Sun, 23 Jan 2011 18:13:41 +0000 Received: from imr-ma02.mx.aol.com ([64.12.206.40]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1Ph4RW-0005a8-JE for rsgb_lf_group@blacksheep.org; Sun, 23 Jan 2011 18:13:41 +0000 Received: from mtaout-ma05.r1000.mx.aol.com (mtaout-ma05.r1000.mx.aol.com [172.29.41.5]) by imr-ma02.mx.aol.com (8.14.1/8.14.1) with ESMTP id p0NIDYNR024199 for ; Sun, 23 Jan 2011 13:13:34 -0500 Received: from White (nrbg-4d072a3c.pool.mediaWays.net [77.7.42.60]) by mtaout-ma05.r1000.mx.aol.com (MUA/Third Party Client Interface) with ESMTPA id DFFC7E0000B6 for ; Sun, 23 Jan 2011 13:13:31 -0500 (EST) Message-ID: From: "Markus Vester" To: References: <4D3C6284.9030801@iup.uni-heidelberg.de> Date: Sun, 23 Jan 2011 19:13:32 +0100 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal Importance: Normal X-Mailer: Microsoft Windows Live Mail 12.0.1606 X-MimeOLE: Produced By Microsoft MimeOLE V12.0.1606 X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001 Subject: Re: LF: 17.8 kHz ? Content-Type: multipart/alternative; boundary="----=_NextPart_000_005C_01CBBB31.A0073690" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.6 required=5.0 tests=HTML_40_50,HTML_MESSAGE, MISSING_OUTLOOK_NAME 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: 3039ac1d40504d3c7010492e X-AOL-IP: 195.171.43.25 ------=_NextPart_000_005C_01CBBB31.A0073690 Content-Type: text/plain; charset="ISO-8859-15" Content-Transfer-Encoding: quoted-printable Stefan, this is interesting. Signal was visible here 16:30 to 17:00 UT= , and consists of two tones at +- 25 Hz plus some weaker modulation co= ntinuum.=20 Google finds a reference to Tacamo (military airborne transmitters),= mentioned in Dec 2009 in the Yahoo VLF group: http://tech.dir.groups.yahoo.com/group/VLF_Group/message/14805 Now since 18:00 UT there is a plain carrier exactly on 17.6 Hz with co= mparable strength. Paul Nicholson's DF spectrum http://abelian.org/vlf/spectrum.shtml sees it around 90=B0 / 270=B0 azimuth (probably west if strong in TF). Best regards, Markus (DF6NM) From: Stefan Sch=E4fer=20 Sent: Sunday, January 23, 2011 6:16 PM To: rsgb_lf_group@blacksheep.org=20 Subject: LF: 17.8 kHz ? VLF, There is a strange trace at 17.8 kHz that appears rather weak on my=20 grabber but very strong on the TF3HZ VLF grabber. What is it? Any idea= s? 73, Stefan/DK7FC ------=_NextPart_000_005C_01CBBB31.A0073690 Content-Type: text/html; charset="ISO-8859-15" Content-Transfer-Encoding: quoted-printable
Stefan, this is interesting. Signal= was=20 visible here 16:30 to 17:00 UT, and consists of two tones at +-= 25 Hz plus=20 some weaker modulation continuum.
 
Google finds a reference to Taca= mo (military=20 airborne transmitters), mentioned in Dec 2009 in the Yahoo VLF=20 group:
 
Now since 18:00 UT there is a plain= carrier exactly=20 on 17.6 Hz with comparable strength. Paul Nicholson's DF=20 spectrum
sees it around 90=B0 / 270=B0 az= imuth (probably=20 west if strong in TF).
 
Best regards,
Markus (DF6NM)
 

Sent: Sunday, January 23, 2011 6:16 PM
Subject: LF: 17.8 kHz ?

VLF,

There is a strange trace at 17.8 kHz that= appears=20 rather weak on my
grabber but very strong on the TF3HZ VLF grabber= . What is=20 it? Any ideas?

73, Stefan/DK7FC

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