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;
Message-ID: <519F4C598B3F4D8BB50EF4AD4C85E70A@White>
From: "Markus Vester" <markusvester@aol.com>
To: <rsgb_lf_group@blacksheep.org>
Cc: "Paul" <paul@abelian.netcom.co.uk>
Date: Fri, 3 Jan 2014 13:21:40 +0100
MIME-Version: 1.0
Importance: Normal
Subject: Fw: VLF: 8.275 kHz
Content-Type: multipart/alternative;
	boundary="----=_NextPart_000_0020_01CF0886.BCB5E1B0"
Sender: owner-rsgb_lf_group@blacksheep.org
Precedence: bulk
Reply-To: rsgb_lf_group@blacksheep.org

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

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META content=3Dtext/html;charset=3Diso-8859-1 =
http-equiv=3DContent-Type>
<META name=3DGENERATOR content=3D"MSHTML 8.00.6001.23543"></HEAD>
<BODY style=3D"PADDING-LEFT: 10px; PADDING-RIGHT: 10px; PADDING-TOP: =
15px"=20
id=3DMailContainerBody leftMargin=3D0 topMargin=3D0 bgColor=3D#ffffff=20
CanvasTabStop=3D"true" name=3D"Compose message area">
<DIV><FONT size=3D2 face=3DArial>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.&nbsp;Mains harmonics tend to drift a bit with the line frequeny so =
further=20
away is better. </FONT></DIV>
<DIV><FONT size=3D2 face=3DArial></FONT>&nbsp;</DIV>
<DIV><FONT size=3D2 face=3DArial>
<DIV><FONT size=3D2 face=3DArial>Thus I retract my preposition, and =
suggest instead=20
to stay with the original <STRONG>8270 Hz</STRONG>.</FONT></DIV>
<DIV><FONT size=3D2 face=3DArial></FONT>&nbsp;</DIV>
<DIV><FONT size=3D2 face=3DArial>Uwe, go =
ahead!</FONT></DIV></FONT></DIV>
<DIV><FONT size=3D2 face=3DArial></FONT>&nbsp;</DIV>
<DIV><FONT size=3D2 face=3DArial>Best 73,</FONT></DIV>
<DIV><FONT size=3D2 face=3DArial>Markus</FONT></DIV>
<DIV><FONT size=3D2 face=3DArial></FONT>&nbsp;</DIV>
<DIV><FONT size=3D2 face=3DArial>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&nbsp;like&nbsp;carriers from&nbsp;switchmode power =
conversion&nbsp;units=20
(eg near 8 kHz), accompanied&nbsp;by&nbsp;the telltale 33 Hz spaced =
sidebands.=20
Unfortunately these frequencies are not easily predictable.=20
<DIV>&nbsp;</DIV></FONT></DIV>
<DIV style=3D"FONT: 10pt Tahoma">
<DIV><FONT face=3DArial></FONT><FONT face=3DArial></FONT><FONT=20
face=3DArial></FONT><BR></DIV>
<DIV style=3D"BACKGROUND: #f5f5f5">
<DIV style=3D"font-color: black"><B>From:</B> <A =
title=3DPaul@abelian.netcom.co.uk=20
href=3D"mailto:Paul@abelian.netcom.co.uk">Paul</A> </DIV>
<DIV><B>Sent:</B> Friday, January 03, 2014 12:56 PM</DIV>
<DIV><B>To:</B> <A title=3Dmarkusvester@aol.com=20
href=3D"mailto:markusvester@aol.com">Markus Vester</A> </DIV>
<DIV><B>Subject:</B> Re: VLF: 8.275 kHz</DIV></DIV></DIV>
<DIV><BR></DIV><BR>8970 is well placed with respect to harmonics =
of<BR>both 50=20
and 60Hz.<BR><BR>8270/8275 not so good in a 60Hz region.<BR><BR>8124 to =
8126=20
would be a good range, considering<BR>harmonics of 16.67Hz, 50Hz, and=20
60Hz.<BR><BR>Let me know what is decided, I will switch my =
spectrogram<BR>over=20
to the new band.<BR><BR>--<BR>Paul Nicholson<BR>--<BR></BODY></HTML>

------=_NextPart_000_0020_01CF0886.BCB5E1B0--