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Date: Thu, 22 Jul 2010 13:51:19 +0100
Message-ID: <AANLkTik4zlxUOEtu_FnYDjZbg_BFZ78wDKeHAJ7heX8G@mail.gmail.com>
From: Roger Lapthorn <rogerlapthorn@gmail.com>
To: rsgb_lf_group@blacksheep.org
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Subject: Re: VLF: Changes in MSK usage
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If there really is spectrum being freed up in the LF/VLF regions should we
be pressing our governments for further small amateur allocations below
100kHz? For example, how about an allocation at 73kHz (again in the UK) and
a band somewhere between 30-40kHz? With the improvements in weak signal
techniques in the last few years such allocations would be extremely
interesting and ripe for some serious research that would contribute to
science, and be a lot of fun.

Regarding Dave Gibson's thoughts on earth electrodes, I'm puzzled. As Stefan
says, the current is returned by a path within the soil/rock and a loop MUST
exist. Can the structure be modelled *both* as a magnetic loop and a
electric dipole? In my mind I can visualise the loop and how this might
work, but I cannot easily visualise the dipole, except as a very short one
with a lossy resistance strung between its ends.

73s
Roger



On 22 July 2010 09:15, Markus Vester <markusvester@aol.com> wrote:

> Dear VLF enthusiasts,
>
> browsing through saved VLF-grabber screenshots, I noticed some recent
> changes of VLF MSK-band usage:
>
> 2010-06-24 06:00  20.27 kHz (ICV) QRT
> 2010-06-30 05:00  16.4 kHz (JXN) QRT
> 2010-07-05 07:05  18.3 kHz (HWU) QRT
> 2010-07-08 23:00  21.75 kHz (HWU) break for 6 hours
> 2010-07-10 06:00  22.1 kHz (GQD) switched from 100 bd to 200 bd
> 2010-07-10 10:00  19.58 kHz (GBZ) QRT
>
> Thus within a couple of weeks, half of the European military signals have
> gone for good.
>
> Perhaps there is less need for submarine communications in today's world...
> let's hope that the submarines themselves (along with all that other
> military hardware) may become obsolete in tomorrow's world!
>
> 73, Markus (DF6NM)
>
>



-- 
http://g3xbm-qrp.blogspot.com/
http://www.g3xbm.co.uk
http://www.youtube.com/user/g3xbm
G3XBM    GQRP 1678      ISWL G11088

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Content-Transfer-Encoding: quoted-printable

If there really is spectrum being freed up in the LF/VLF regions should we=
 be pressing our governments for further small amateur allocations below=
 100kHz? For example, how about an allocation at 73kHz (again in the UK)=
 and a band somewhere between 30-40kHz? With the improvements in weak sign=
al techniques in the last few years such allocations would be extremely in=
teresting and ripe for some serious research that would contribute to scie=
nce, and be a lot of fun.<br>
<br>Regarding Dave Gibson&#39;s thoughts on earth electrodes, I&#39;m puzz=
led. As Stefan says, the current is returned by a path within the soil/roc=
k and a loop MUST exist. Can the structure be modelled <i>both</i> as a ma=
gnetic loop and a electric dipole? In my mind I can visualise the loop and=
 how this might work, but I cannot easily visualise the dipole, except as=
 a very short one with a lossy resistance strung between its ends.<br>
<br>73s<br>Roger<br><br><br><br><div class=3D"gmail_quote">On 22 July 2010=
 09:15, Markus Vester <span dir=3D"ltr">&lt;<a href=3D"mailto:markusvester=
@aol.com">markusvester@aol.com</a>&gt;</span> wrote:<br><blockquote class=
=3D"gmail_quote" style=3D"margin: 0pt 0pt 0pt 0.8ex; border-left: 1px soli=
d rgb(204, 204, 204); padding-left: 1ex;">
<font color=3D"black" face=3D"arial" size=3D"2">
<div style=3D"clear: both;">Dear VLF enthusiasts,</div>


<div style=3D"clear: both;">=A0</div>


<div style=3D"clear: both;">browsing through saved VLF-grabber screenshots=
, I noticed some recent changes=A0of VLF MSK-band usage:</div>


<div style=3D"clear: both;">=A0</div>


<div style=3D"clear: both;">2010-06-24 06:00=A0 20.27 kHz (ICV) QRT<br>
2010-06-30 05:00=A0 16.4 kHz (JXN) QRT<br>
2010-07-05 07:05=A0 18.3 kHz (HWU) QRT<br>
2010-07-08 23:00=A0 21.75 kHz (HWU) break for 6 hours<br>
2010-07-10 06:00=A0 22.1 kHz (GQD) switched from 100 bd to 200 bd<br>
2010-07-10 10:00=A0 19.58 kHz (GBZ) QRT</div>


<div style=3D"clear: both;">=A0</div>


<div style=3D"clear: both;">Thus within a couple of weeks, half of the Eur=
opean military signals have gone for good. </div>


<div style=3D"clear: both;">=A0</div>


<div style=3D"clear: both;">Perhaps there is less need for submarine commu=
nications in today&#39;s world... let&#39;s hope that the submarines thems=
elves (along with all that other military hardware) may become obsolete in=
 tomorrow&#39;s world!</div>



<div style=3D"clear: both;">=A0</div>


<div style=3D"clear: both;">73, Markus (DF6NM)</div>


<div style=3D"clear: both;">=A0</div>
</font>
</blockquote></div><br><br clear=3D"all"><br>-- <br><a href=3D"http://g3xb=
m-qrp.blogspot.com/">http://g3xbm-qrp.blogspot.com/</a><br><a href=3D"http=
://www.g3xbm.co.uk">http://www.g3xbm.co.uk</a><br><a href=3D"http://www.yo=
utube.com/user/g3xbm">http://www.youtube.com/user/g3xbm</a><br>
G3XBM=A0 =A0 GQRP 1678=A0 =A0 =A0 ISWL G11088<br>

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