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From: MarkusVester@aol.com
Message-ID: <31c.31f0dac.31754ced@aol.com>
Date: Mon, 17 Apr 2006 15:56:29 EDT
To: rsgb_lf_group@blacksheep.org
MIME-Version: 1.0
Subject: Re: LF: New transmitter being tested on 18.5 kHz
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Wolfgang,

the funny thing is that the 18.5 kHz DF variations appeared during all three=
=20
nights, whereas the colour of 23.4 was steady during that time, except for=20
short periods at sunrise / sunset.

Mentioning wavelength... could the effect have to do with the frequency=20
itself? I am 476 km from Saterland, and for an assumed reflection height of=20=
78 km,=20
the geometrical path difference between groundwave and skywave would be abou=
t=20
25 km. This is two wavelengths at 24 kHz, versus 1.5 wavelengths near 18 kHz=
,=20
possibly resulting in cancellation and an increased sensitivity against smal=
l=20
perturbations.=20

Will keep looking...

73 de Markus
=20
In einer eMail vom 17.04.2006 21:07:57 Westeurop=E4ische Sommerzeit schreibt=
=20
dl4yhf@freenet.de:=20

> Will be interesting to see if that directional VLF fading is related to=20
> the time of day, or if you caught a SID event by chance, and if similar=20
> things happened on LF the same time.
> My own bearings of the new 18.5 kHz transmitter only vary by a few=20
> degrees, but  I'm just 8 wavelengths away from it ;-)
>=20


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<HTML><FONT FACE=3Darial,helvetica><HTML><FONT  SIZE=3D2 PTSIZE=3D10 FAMILY=
=3D"SANSSERIF" FACE=3D"Arial" LANG=3D"2">Wolfgang,<BR>
<BR>
the funny thing is that the 18.5 kHz DF variations appeared during all three=
 nights, whereas the colour of 23.4 was steady during that time, except for=20=
short periods at sunrise / sunset.<BR>
<BR>
Mentioning wavelength... could the effect have to do with the frequency itse=
lf? I am 476 km from Saterland, and for an assumed reflection height of 78 k=
m, the geometrical path difference between groundwave and skywave would be a=
bout 25 km. This is two wavelengths at 24 kHz, versus 1.5 wavelengths near 1=
8 kHz, possibly resulting in cancellation and an increased sensitivity again=
st small perturbations. <BR>
<BR>
Will keep looking...<BR>
<BR>
73 de Markus<BR>
 <BR>
In einer eMail vom 17.04.2006 21:07:57 Westeurop=E4ische Sommerzeit schreibt=
 dl4yhf@freenet.de: <BR>
<BR>
<BLOCKQUOTE TYPE=3DCITE style=3D"BORDER-LEFT: #0000ff 2px solid; MARGIN-LEFT=
: 5px; MARGIN-RIGHT: 0px; PADDING-LEFT: 5px">Will be interesting to see if t=
hat directional VLF fading is related to <BR>
the time of day, or if you caught a SID event by chance, and if similar <BR>
things happened on LF the same time.<BR>
My own bearings of the new 18.5 kHz transmitter only vary by a few <BR>
degrees, but&nbsp; I'm just 8 wavelengths away from it ;-)<BR>
</BLOCKQUOTE><BR>
<BR>
</FONT></HTML>
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