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[195.171.43.25]) by mx.google.com with ESMTP id hh3si753025wib.75.2014.01.03.04.53.57 for ; Fri, 03 Jan 2014 04:53:58 -0800 (PST) Received-SPF: neutral (google.com: 195.171.43.25 is neither permitted nor denied by best guess record for domain of owner-rsgb_lf_group@blacksheep.org) client-ip=195.171.43.25; Authentication-Results: mx.google.com; spf=neutral (google.com: 195.171.43.25 is neither permitted nor denied by best guess record for domain of owner-rsgb_lf_group@blacksheep.org) smtp.mail=owner-rsgb_lf_group@blacksheep.org; dkim=pass header.i=@mx.aol.com Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Vz3mD-0002ME-0Y for rs_out_1@blacksheep.org; Fri, 03 Jan 2014 12:22:57 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Vz3mC-0002M5-I8 for rsgb_lf_group@blacksheep.org; Fri, 03 Jan 2014 12:22:56 +0000 Received: from omr-m09.mx.aol.com ([64.12.143.82]) by relay1.thorcom.net with esmtps (TLSv1:AES256-SHA:256) (Exim 4.77) (envelope-from ) id 1Vz3mA-0004uL-NF for rsgb_lf_group@blacksheep.org; Fri, 03 Jan 2014 12:22:55 +0000 Received: from mtaout-mcc01.mx.aol.com (mtaout-mcc01.mx.aol.com [172.26.253.77]) by omr-m09.mx.aol.com (Outbound Mail Relay) with ESMTP id BD02D700000A7; Fri, 3 Jan 2014 07:22:51 -0500 (EST) Received: from White (95-91-238-155-dynip.superkabel.de [95.91.238.155]) by mtaout-mcc01.mx.aol.com (MUA/Third Party Client Interface) with ESMTPA id 0431B380000A9; Fri, 3 Jan 2014 07:22:50 -0500 (EST) Message-ID: <519F4C598B3F4D8BB50EF4AD4C85E70A@White> From: "Markus Vester" To: Cc: "Paul" Date: Fri, 3 Jan 2014 13:21:40 +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-aol-global-disposition: G DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mx.aol.com; s=20121107; t=1388751771; bh=Rqi48Uigq+T0IAyXELgXbx3X2x9xOUaxraZTraZxj6w=; h=From:To:Subject:Message-ID:Date:MIME-Version:Content-Type; b=btOZ6hQsx2UIC6N+BqgNN19V//4HnIyubeZy3T+OD80ZgYkw21imtHPxNHctrt82/ o4+VotmHsF3J9YD2c44rbSgfAHZqhyN6ngdOMggl+tz2MlMmW/EYg1X2eyhJxzH051 IPCCy2wg1sbHx9KOjsssIGv+O4y+UG5l1uj68ptw= x-aol-sid: 3039ac1afd4d52c6ab9a5e91 X-AOL-IP: 95.91.238.155 X-Spam-Score: -0.5 (/) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has identified this incoming email as possible spam. The original message has been attached to this so you can view it (if it isn't spam) or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: Paul Nicholson put forth the important argument that we'd better stay away from 8280 because it's a multiple of 60 Hz. Mains harmonics tend to drift a bit with the line frequeny so further away is better. [...] Content analysis details: (-0.5 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [64.12.143.82 listed in list.dnswl.org] 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (markusvester[at]aol.com) -0.0 SPF_PASS SPF: sender matches SPF record -0.5 RP_MATCHES_RCVD Envelope sender domain matches handover relay domain 0.0 HTML_MESSAGE BODY: HTML included in message 0.0 T_DKIM_INVALID DKIM-Signature header exists but is not valid X-Scan-Signature: 968492e608ae81f946d7c13a3d073eeb Subject: Fw: VLF: 8.275 kHz Content-Type: multipart/alternative; boundary="----=_NextPart_000_0020_01CF0886.BCB5E1B0" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.9 required=5.0 tests=HTML_30_40,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 Dies ist eine mehrteilige Nachricht im MIME-Format. ------=_NextPart_000_0020_01CF0886.BCB5E1B0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Paul Nicholson put forth the important argument that we'd better stay = away from 8280 because it's a multiple of 60 Hz. Mains harmonics tend to = drift a bit with the line frequeny so further away is better.=20 Thus I retract my preposition, and suggest instead to stay with the = original 8270 Hz. Uwe, go ahead! Best 73, Markus PS Direct harmonics from 16.67 Hz are relatively weak here, even though = the railway is only 400 m away. It looks more like carriers from = switchmode power conversion units (eg near 8 kHz), accompanied by the = telltale 33 Hz spaced sidebands. Unfortunately these frequencies are not = easily predictable.=20 From: Paul=20 Sent: Friday, January 03, 2014 12:56 PM To: Markus Vester=20 Subject: Re: VLF: 8.275 kHz 8970 is well placed with respect to harmonics of both 50 and 60Hz. 8270/8275 not so good in a 60Hz region. 8124 to 8126 would be a good range, considering harmonics of 16.67Hz, 50Hz, and 60Hz. Let me know what is decided, I will switch my spectrogram over to the new band. -- Paul Nicholson -- ------=_NextPart_000_0020_01CF0886.BCB5E1B0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Paul Nicholson put forth the important = argument=20 that we'd better stay away from 8280 because it's a multiple of 60=20 Hz. Mains harmonics tend to drift a bit with the line frequeny so = further=20 away is better.
 
Thus I retract my preposition, and = suggest instead=20 to stay with the original 8270 Hz.
 
Uwe, go = ahead!
 
Best 73,
Markus
 
PS Direct harmonics from 16.67 Hz are = relatively=20 weak here, even though the railway is only 400 m away. It looks=20 more like carriers from switchmode power = conversion units=20 (eg near 8 kHz), accompanied by the telltale 33 Hz spaced = sidebands.=20 Unfortunately these frequencies are not easily predictable.=20
 

From: Paul
Sent: Friday, January 03, 2014 12:56 PM
Subject: Re: VLF: 8.275 kHz


8970 is well placed with respect to harmonics = of
both 50=20 and 60Hz.

8270/8275 not so good in a 60Hz region.

8124 to = 8126=20 would be a good range, considering
harmonics of 16.67Hz, 50Hz, and=20 60Hz.

Let me know what is decided, I will switch my = spectrogram
over=20 to the new band.

--
Paul Nicholson
--
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