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Date: Thu, 24 Mar 2011 19:01:11 +0100
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Subject: Re: LF: Wasilla Alaska VLF - offline
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Hi Laurence, Markus, VLF,

Hmmmm, about the 60000 windows, Paul Nicholson means.... (see a part of=20
our emails below)

Am 19.03.2011 09:41, schrieb Paul:
> Hi Stefan,
>
> > Well, you see people are running slower and slower windows,
> > such as "DFCW-60000"
>
> There is a limit set by the variability of the path length.
>
> For example, see
>
> http://abelian.org/vlf/tmp/110319a.gif
>
> This shows the absolute phase of NAA at 24kHz over a great
> circle distance of 4672km.   The graph spans 5 and a bit days.
> During the day the phase advances because the D-layer height
> falls from about 90km to 70km.   The pattern repeats each day
> with the night-time phase (path length) pretty much the same
> each night, but the daytime path varies.
>
> The path change between day and night is almost a complete
> cycle at 24kHz, so we might expect 100 to 120 degrees at 9kHz.
>
> The value of a long coherent integration will be significantly
> reduced if the phase changes by more than 30 or 40 deg.
> If the phase changes by more than 90 deg, a long integration
> will be worse than a shorter one.

Maybe "60000" is better anyway, as seen between DJ8WX or OE5ODL and=20
TF3HZ. Anyway i would start with a faster mode and go for a slower, if=20
nothing is visible. It's your dicision, Laurence :-)

73, Stefan/DK7FC



Am 24.03.2011 11:40, schrieb Markus Vester:
> Hi Laurence,
> if I had only one to choose from, I'd definitely opt for the slowest=20
> "60000" window at 47 uHz. Depending on antenna orientation, this would=
=20
> definitely give Scott a chance, or perhaps one of us over here. Would=20
> an onnidirectional E-field work as well for you as the RX loops?
> Running the second FFT for the Alphas nearly doubles the CPU load, so=20
> you may want to skip that.
> Thanks for the great work!
> Best 73,
> Markus
>
> -----Urspr=C3=BCngliche Mitteilung-----
> Von: Laurence KL7UK <hellozerohellozero@hotmail.com>
> An: rsgb_lf_group@blacksheep.org
> Verschickt: Mi., 23. Mrz. 2011, 15:34
> Thema: RE: LF: Wasilla Alaska VLF - offline
>
> VLF pre Eu dawn signals are way down from mid winter Stefan, but that=20
> signature increase on DHO38 signal between 0500 and 0700Z is still=20
> there. Looks to me like a mid winter opportunity only on this 2 x=20
> Auroral oval path at this range, but I could be mistaken. The loop is=20
> tensioned from movement by an ice screw in the lake and given the=20
> increasing temps Im sure it will come dislodged sooner than later -=20
> the other side is tensioned to a Birch tree so I dont think it will=20
> move. If Scott warms up his #2 Ill have to get someone to turn the=20
> array as hes in a Cosine null at the moment.
>
> Ill take a look at the processor and see what gives but welcome any=20
> direction on speeds/fft longterm so I can leave one or two screens up=20
> longer term without frying the proc..
>
> Not sure if Ill be in the same location by next winter :-(( Your going=
=20
> to have to work out how to get an antennae up and stable in the latter=
=20
> part of the of the Eu night for this path to work me thinks :-)))
>
> Cheers
> Laurence KL7UK, Wasilla Alaska  remote op'd from /5 Oklahoma
>
> ------------------------------------------------------------------------
> Date: Wed, 23 Mar 2011 02:24:25 +0100
> From: schaefer@iup.uni-heidelberg.de=20
> <mailto:schaefer@iup.uni-heidelberg.de>
> To: rsgb_lf_group@blacksheep.org <mailto:rsgb_lf_group@blacksheep.org>
> Subject: Re: LF: Wasilla Alaska VLF - offline
>
> Hello Laurence,
>
> No hope for the end of the season? Maybe you are right, unfortunately.=
=20
> But you'll come back in the next season, isn't it? :-) Or maybe just=20
> reducing to wideband and 6000 or so? A pity...
> But thanks for the service and the intersting location to watch and=20
> sharing the optimism!!
> Maybe we'll see what can be done in Greenland, that's a next step into=
=20
> your direction, about...
>
> 73 and good luck,
>
> Stefan/ EI/DK7FC
>
>
>
> =3D

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Hi Laurence, Markus, VLF,<br>
<br>
Hmmmm, about the 60000 windows, Paul Nicholson means.... (see a part of
our emails below)<br>
<br>
Am 19.03.2011 09:41, schrieb Paul:
<blockquote cite=3D"mid:4D846C47.9050409@abelian.netcom.co.uk" type=3D"cit=
e">Hi
Stefan, <br>
  <br>
&gt; Well, you see people are running slower and slower windows, <br>
&gt; such as "DFCW-60000" <br>
  <br>
There is a limit set by the variability of the path length. <br>
  <br>
For example, see <br>
  <br>
=C2=A0<a moz-do-not-send=3D"true" class=3D"moz-txt-link-freetext"   href=
=3D"http://abelian.org/vlf/tmp/110319a.gif">http://abelian.org/vlf/tmp/110=
319a.gif</a>
  <br>
  <br>
This shows the absolute phase of NAA at 24kHz over a great <br>
circle distance of 4672km.=C2=A0=C2=A0 The graph spans 5 and a bit days.=
 <br>
During the day the phase advances because the D-layer height <br>
falls from about 90km to 70km.=C2=A0=C2=A0 The pattern repeats each day <b=
r>
with the night-time phase (path length) pretty much the same <br>
each night, but the daytime path varies. <br>
  <br>
The path change between day and night is almost a complete <br>
cycle at 24kHz, so we might expect 100 to 120 degrees at 9kHz. <br>
  <br>
The value of a long coherent integration will be significantly <br>
reduced if the phase changes by more than 30 or 40 deg. <br>
If the phase changes by more than 90 deg, a long integration <br>
will be worse than a shorter one.</blockquote>
<br>
Maybe "60000" is better anyway, as seen between DJ8WX or OE5ODL and
TF3HZ. Anyway i would start with a faster mode and go for a slower, if
nothing is visible. It's your dicision, Laurence :-)<br>
<br>
73, Stefan/DK7FC<br>
<br>
<br>
<br>
Am 24.03.2011 11:40, schrieb Markus Vester:
<blockquote   cite=3D"mid:8CDB82718FF0CEC-B4C-BB65@webmail-d038.sysops.aol=
.com"   type=3D"cite"><font color=3D"black" face=3D"arial" size=3D"2">
  <div>Hi Laurence,</div>
  <div>=C2=A0</div>
  <div>if I had only one to=C2=A0choose from, I'd definitely=C2=A0opt for=
 the
slowest "60000" window at 47 uHz. Depending on antenna orientation,
this would definitely give Scott=C2=A0a chance, or perhaps one of us over
here.=C2=A0Would an onnidirectional E-field work as well for you as the RX
loops?</div>
  <div>=C2=A0</div>
  <div>Running the second FFT for the Alphas nearly doubles the CPU
load,=C2=A0so you may=C2=A0want to=C2=A0skip that.</div>
  <div>=C2=A0</div>
  <div>Thanks for the great work!</div>
  <div>=C2=A0</div>
  <div>Best 73,=C2=A0</div>
  <div>Markus<br>
  </div>
  <br>
  <div   style=3D"font-family: arial,helvetica; color: black; font-size:=
 10pt;">-----Urspr=C3=BCngliche
Mitteilung----- <br>
Von: Laurence KL7UK <a class=3D"moz-txt-link-rfc2396E" href=3D"mailto:hell=
ozerohellozero@hotmail.com">&lt;hellozerohellozero@hotmail.com&gt;</a><br>
An: <a class=3D"moz-txt-link-abbreviated" href=3D"mailto:rsgb_lf_group@bla=
cksheep.org">rsgb_lf_group@blacksheep.org</a><br>
Verschickt: Mi., 23. Mrz. 2011, 15:34<br>
Thema: RE: LF: Wasilla Alaska VLF - offline<br>
  <br>
  <div id=3D"AOLMsgPart_2_e13f2a33-c3fb-48b3-9199-89bcffbc6b06">
  <style>#AOLMsgPart_2_e13f2a33-c3fb-48b3-9199-89bcffbc6b06 td{color: blac=
k;}   #AOLMsgPart_2_e13f2a33-c3fb-48b3-9199-89bcffbc6b06 .hmmessage P  {=
  margin:0px;  padding:0px  }  #AOLMsgPart_2_e13f2a33-c3fb-48b3-9199-89bcf=
fbc6b06 body.hmmessage  {  font-size: 10pt;  font-family:Tahoma  }  </styl=
e>VLF
pre Eu dawn signals are way down from mid winter Stefan, but that
signature=C2=A0increase=C2=A0on DHO38 signal between 0500 and 0700Z is sti=
ll
there. Looks to me like a mid winter=C2=A0opportunity only on this 2 x
Auroral oval path at this range, but I could be mistaken. The loop is
tensioned from movement by an ice screw in the=C2=A0lake and given the
increasing temps Im sure it will come dislodged sooner than later - the
other side is tensioned to a Birch tree so I=C2=A0dont think it will move.
If Scott warms up his #2 Ill have to get someone to turn the array as
hes in a=C2=A0Cosine null at the moment.<br>
=C2=A0<br>
Ill take a look at the processor and see what gives=C2=A0but welcome any
direction on speeds/fft longterm so I can leave one or two screens up
longer term without frying the proc.. <br>
=C2=A0<br>
Not sure if Ill be in the same location by next winter :-(( Your going
to have to work out how to get an antennae up and stable in the latter
part of the=C2=A0of the Eu=C2=A0night for this path to work me thinks :-))=
)<br>
=C2=A0<br>
Cheers<br>
Laurence KL7UK, Wasilla Alaska =C2=A0remote op'd from=C2=A0/5 Oklahoma<br>
=C2=A0<br>
  <hr id=3D"stopSpelling">
Date: Wed, 23 Mar 2011 02:24:25 +0100<br>
From: <a moz-do-not-send=3D"true"   href=3D"mailto:schaefer@iup.uni-heidel=
berg.de">schaefer@iup.uni-heidelberg.de</a><br>
To: <a moz-do-not-send=3D"true"   href=3D"mailto:rsgb_lf_group@blacksheep.=
org">rsgb_lf_group@blacksheep.org</a><br>
Subject: Re: LF: Wasilla Alaska VLF - offline<br>
  <br>
Hello Laurence, <br>
  <br>
No hope for the end of the season? Maybe you are right, unfortunately.
But you'll come back in the next season, isn't it? :-) Or maybe just
reducing to wideband and 6000 or so? A pity...<br>
But thanks for the service and the intersting location to watch and
sharing the optimism!!<br>
Maybe we'll see what can be done in Greenland, that's a next step into
your direction, about...<br>
  <br>
73 and good luck, <br>
  <br>
Stefan/ EI/DK7FC<br>
  <blockquote>=C2=A0<br>
=C2=A0<br>
  </blockquote>
=3D </div>
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