Message-ID: <4C482235.70902@iup.uni-heidelberg.de>
Date: Thu, 22 Jul 2010 12:49:25 +0200
From: =?ISO-8859-1?Q?Stefan_Sch=E4fer?= <schaefer@iup.uni-heidelberg.de>
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Subject: Re: VLF: Changes in MSK usage
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Nice said Markus! I also hope so...

Is it possible that they are making a longer break for repairing the 
system? Summer time may be best for that since the achievable 
communication distances are surely decreasing for the military stations 
as well!? As we know, DHO was OFF for abt 2 weeks as well...

And TNX for the nice work you described in your last mail! We will see 
how things change when i come up with a 600m spaced earth antenna. This 
could be this evening! :-)

What do you think about the opinion of David Gibson? Are we totally 
wrong when assuming a earth antenna behaves (almost) like a loop antenna?
Clear is that the current has to come back to the other electrode and so 
there must be an area between the wire and the ground. And clear is that 
there is a skin depth that is a function of the frequency. So the 
antenna must partly act as a loop.
If the resistance between the electrodes is 0, than it is a loop, if it 
is infinity (DC measurement) it may be like a (short) dipole close to 
ground.
What is the problem for the theoretics just to simulate that antenna? I 
suppose it is not really possible with EZNEC but there are more complex 
programs...
Never mind. Theoretic assumptions can be wrong (e.g. assuming wrong 
parameters such as the conductivity and epsilon r of the different soil 
layers) but a practical experiment gives REAL results, thats my theory 
;-) Almost all of us are spending too much time in front of a PC or TV. 
Thus, practical experiments are not only a benefit for the tecnical 
world but first of all for the own HEALTH and creativity :-)

Best 73, Stefan/DK7FC

Am 22.07.2010 10:15, schrieb Markus Vester:
> 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)

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Nice said Markus! I also hope so...<br>
<br>
Is it possible that they are making a longer break for repairing the
system? Summer time may be best for that since the achievable
communication distances are surely decreasing for the military stations
as well!? As we know, DHO was OFF for abt 2 weeks as well...<br>
<br>
And TNX for the nice work you described in your last mail! We will see
how things change when i come up with a 600m spaced earth antenna. This
could be this evening! :-) <br>
<br>
What do you think about the opinion of David Gibson? Are we totally
wrong when assuming a earth antenna behaves (almost) like a loop
antenna? <br>
Clear is that the current has to come back to the other electrode and
so there must be an area between the wire and the ground. And clear is
that there is a skin depth that is a function of the frequency. So the
antenna must partly act as a loop.<br>
If the resistance between the electrodes is 0, than it is a loop, if it
is infinity (DC measurement) it may be like a (short) dipole close to
ground. <br>
What is the problem for the theoretics just to simulate that antenna? I
suppose it is not really possible with EZNEC but there are more complex
programs... <br>
Never mind. Theoretic assumptions can be wrong (e.g. assuming wrong
parameters such as the conductivity and epsilon r of the different soil
layers) but a practical experiment gives REAL results, thats my theory
;-) Almost all of us are spending too much time in front of a PC or TV.
Thus, practical experiments are not only a benefit for the tecnical
world but first of all for the own HEALTH and creativity :-)<br>
<br>
Best 73, Stefan/DK7FC<br>
<br>
Am 22.07.2010 10:15, schrieb Markus Vester:
<blockquote   cite="mid:8CCF78D291F2FAB-A90-8915@webmail-m003.sysops.aol.com"   type="cite"><font color="black" face="arial" size="2">
  <div style="clear: both;">Dear VLF enthusiasts,</div>
  <div style="clear: both;">&nbsp;</div>
  <div style="clear: both;">browsing through saved VLF-grabber
screenshots, I noticed some recent changes&nbsp;of VLF MSK-band usage:</div>
  <div style="clear: both;">&nbsp;</div>
  <div style="clear: both;">2010-06-24 06:00&nbsp; 20.27 kHz (ICV) QRT<br>
2010-06-30 05:00&nbsp; 16.4 kHz (JXN) QRT<br>
2010-07-05 07:05&nbsp; 18.3 kHz (HWU) QRT<br>
2010-07-08 23:00&nbsp; 21.75 kHz (HWU) break for 6 hours<br>
2010-07-10 06:00&nbsp; 22.1 kHz (GQD) switched from 100 bd to 200 bd<br>
2010-07-10 10:00&nbsp; 19.58 kHz (GBZ) QRT</div>
  <div style="clear: both;">&nbsp;</div>
  <div style="clear: both;">Thus within a couple of weeks, half of the
European military signals have gone for good. </div>
  <div style="clear: both;">&nbsp;</div>
  <div style="clear: both;">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!</div>
  <div style="clear: both;">&nbsp;</div>
  <div style="clear: both;">73, Markus (DF6NM)</div>
  <div style="clear: both;">&nbsp;</div>
  </font>
</blockquote>
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