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Date: Tue, 15 Nov 2011 21:11:28 +0000
Message-ID: <CAHAQVWOd7jruiqNMZkvU5NT2BfshCGzg3KzaCGSCz99UD0wLCg@mail.gmail.com>
From: Roger Lapthorn <rogerlapthorn@gmail.com>
To: rsgb_lf_group@blacksheep.org
Cc: Chris Osborn <g3xiz@yahoo.co.uk>
Subject: Re: VLF: 8970 Hz transmissions, soon again here
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Hi Stefan (and other VLF fans),

The last time I checked, G3XIZ was still awaiting the renewal of his
8.7-9.1kHz band NoV from OFCOM. Mine came through a few weeks ago, although
I have yet to radiate other than pW powers with my experiments on TX being
earth mode.

My VLF RX system is awaiting your next test Stefan, but please try to give
me a few days warning of (weather permitting) activity so that I can dust
off the kit and check all is working. It is some months since I have used
to loop and preamp with SL on VLF.

By the way, do we know exactly WHAT Paul Nicolson does to detect such weak
signals so well? Has anyone heard/read technical details of his
super-sensitive and well engineered receiving systems?

73s
Roger G3XBM


2011/11/15 Stefan Sch=E4fer <Stefan.Schaefer@iup.uni-heidelberg.de>

> **
> VLF,
>
> Am 15.11.2011 17:03, schrieb DENNIS EASTERLING:
>
> [...] I also have a mini-whip, but this has been extended for
> VLF purposes. [...]
>
>
> ...which is good since soon there will be some activity again on 8970 Hz.
> If you like you can join in to the group of successful listeners on the 3=
3
> km band.
>
> Yesterday i carried my TX coil to the fixed antenna here. Also the PA and
> variometer part of course. I do inted to use the fixed antenna.
> I did some calculations about the radiation resistance and losses and
> power at maximum voltage (50 kV rms on the wire) and found that the ERP
> will be about 10 dB higher than expected, i.e. i could radiate something =
in
> the range of many 100 uW up to 1 mW or theoretically up to 2 mW. We will
> see and measure.
>
> Paul Nicholsen reported about a very senistive receiver in USA that allow=
s
> long time integration, i.e. not producing a spectrogram but integrating a
> given TX time into a single bin, like Paul usually does.
> Here on the fixed antenna i could do night transmissions. 500W TX power
> key down for 24h is no problem (as long as there is no rain).
>
> So i am optimistic and looking forward to some new work on the dreamers
> band!
>
> Also i would be interested if there is (still) some interest in VLF in
> this group. For Paul, a endless straight "carrier" would be the optimium
> while a radio amateur may like to have some true ID and maybe a message t=
o
> be read and displayed. What about the grabber runners and new prepared VL=
F
> receiving stations?
>
> Probably i will start next week but may do some spontaneous tests before.=
..
>
> 73, Stefan/DK7FC
>
> PS: I would like to see other VLF transmitting stations as well. What
> about G3XIZ, DF6NM, OE3GHB, OE5ODL, OK2BVG, DJ8WX? We all could leave som=
e
> common traces again in the excellent dark spectrogram backgrounds!
>
>
>


--=20

http://g3xbm-qrp.blogspot.com/
http://www.g3xbm.co.uk
https://sites.google.com/site/sub9khz/
http://qss2.blogspot.com/

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Hi Stefan (and other VLF fans),<br><br>The last time I checked, G3XIZ was s=
till awaiting the renewal of his 8.7-9.1kHz band NoV from OFCOM. Mine came =
through a few weeks ago, although I have yet to radiate other than pW power=
s with my experiments on TX being earth mode.<br>
<br>My VLF RX system is awaiting your next test Stefan, but please try to g=
ive me a few days warning of (weather permitting) activity so that I can du=
st off the kit and check all is working. It is some months since I have use=
d to loop and preamp with SL on VLF.<br>
<br>By the way, do we know exactly WHAT Paul Nicolson does to detect such w=
eak signals so well? Has anyone heard/read technical details of his super-s=
ensitive and well engineered receiving systems?<br><br>73s<br>Roger G3XBM<b=
r>
=A0<br><br><div class=3D"gmail_quote">2011/11/15 Stefan Sch=E4fer <span dir=
=3D"ltr">&lt;<a href=3D"mailto:Stefan.Schaefer@iup.uni-heidelberg.de">Stefa=
n.Schaefer@iup.uni-heidelberg.de</a>&gt;</span><br><blockquote class=3D"gma=
il_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-lef=
t:1ex;">
<u></u>


 =20

<div bgcolor=3D"#ffffff" text=3D"#000000">
VLF,<br>
<br>
Am <a href=3D"tel:15.11.2011%2017" value=3D"+441511201117" target=3D"_blank=
">15.11.2011 17</a>:03, schrieb DENNIS EASTERLING:
<blockquote type=3D"cite">
 =20
 =20
 =20
 =20
 =20
  <div><font face=3D"Arial">[...] I also have a mini-whip, but this has
been extended for</font></div>
  <div><font face=3D"Arial">VLF purposes. [...]</font></div>
</blockquote>
<br>
...which is good since soon there will be some activity again on 8970
Hz. If you like you can join in to the group of successful listeners on
the 33 km band. <br>
<br>
Yesterday i carried my TX coil to the fixed antenna here. Also the PA
and variometer part of course. I do inted to use the fixed antenna.<br>
I did some calculations about the radiation resistance and losses and
power at maximum voltage (50 kV rms on the wire) and found that the ERP
will be about 10 dB higher than expected, i.e. i could radiate
something in the range of many 100 uW up to 1 mW or theoretically up to
2 mW. We will see and measure. <br>
<br>
Paul Nicholsen reported about a very senistive receiver in USA that
allows long time integration, i.e. not producing a spectrogram but
integrating a given TX time into a single bin, like Paul usually does. <br>
Here on the fixed antenna i could do night transmissions. 500W TX power
key down for 24h is no problem (as long as there is no rain).<br>
<br>
So i am optimistic and looking forward to some new work on the dreamers
band! <br>
<br>
Also i would be interested if there is (still) some interest in VLF in
this group. For Paul, a endless straight &quot;carrier&quot; would be the
optimium while a radio amateur may like to have some true ID and maybe
a message to be read and displayed. What about the grabber runners and
new prepared VLF receiving stations?<br>
<br>
Probably i will start next week but may do some spontaneous tests
before...<br>
<br>
73, Stefan/DK7FC<br>
<br>
PS: I would like to see other VLF transmitting stations as well. What
about G3XIZ, DF6NM, OE3GHB, OE5ODL, OK2BVG, DJ8WX? We all could leave
some common traces again in the excellent dark spectrogram backgrounds!<br>
<br>
<br>
</div>

</blockquote></div><br><br clear=3D"all"><br>-- <br><font color=3D"#888888"=
> <br><a href=3D"http://g3xbm-qrp.blogspot.com/" target=3D"_blank">http://g=
3xbm-qrp.blogspot.com/</a><br><a href=3D"http://www.g3xbm.co.uk" target=3D"=
_blank">http://www.g3xbm.co.uk</a><br>
<a href=3D"https://sites.google.com/site/sub9khz/" target=3D"_blank">https:=
//sites.google.com/site/sub9khz/</a><br><a href=3D"http://qss2.blogspot.com=
/" target=3D"_blank">http://qss2.blogspot.com/</a><br></font><br>

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