Message-ID: <4D78A2A9.4080001@iup.uni-heidelberg.de>
Date: Thu, 10 Mar 2011 11:06:33 +0100
From: =?ISO-8859-1?Q?Stefan_Sch=E4fer?= <Stefan.Schaefer@iup.uni-heidelberg.de>
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To: rsgb_lf_group@blacksheep.org
References: <AANLkTiksDowcKxyJ86R=p-4SqvwcbAQBjQrGY1efm_jN@mail.gmail.com> <003201cbde72$606d6090$0401a8c0@xphd97xgq27nyf> <543492.45357.qm@web28102.mail.ukl.yahoo.com>
In-Reply-To: <543492.45357.qm@web28102.mail.ukl.yahoo.com>
Subject: Re: LF: Re: VLF Stability and soundcard locking
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Hello Pete,

Am 09.03.2011 19:36, schrieb M0FMT:
> Mal.....  for my ten cents worth.
> Without being able to add modulation or on-off keying then no QSO is 
> taking place.
> I suppose you could say if there is a carrier then some one is in the 
> shack but that's not really a QSO.
> I was hoping at the start of this exercise that a CW or other PSK or 
> similar real time QSO could be carried out over say 10/20kms. From the 
> tests Chris G3XIZ has done the best looks like a real time QSO would 
> only happen over a 1.5km path cross town.
> [...]
Remember that i have detected my own CW transmission in a distance of 
40.0 km (far field and above 1 Lambda) on 8970 Hz. Listen at 
http://dl.dropbox.com/u/19882028/DK7FCinCWon8970Hzthe33kmband.WAV
So it is possible to do a CW QSO there. Distance is relative. While it 
is trivial to do a QSO on 20m in 10000km distance it is something 
special to reach 10km on VLF or on Laser-TX or 47 GHz and above.
A VLF x band QSO in CW would have been done if there would be stations 
in that radius of 40, maybe 60 km who would be willing and equipped to 
receive my signal...

73, Stefan/DK7FC


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Hello Pete,<br>
<br>
Am 09.03.2011 19:36, schrieb M0FMT:
<blockquote cite="mid:543492.45357.qm@web28102.mail.ukl.yahoo.com"   type="cite">
  <style type="text/css"><!-- DIV {margin:0px;} --></style>
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  <div>Mal..... &nbsp;for my ten cents worth. </div>
  <div>&nbsp;</div>
  <div>Without being able to add modulation or on-off keying then no
QSO is taking place. </div>
  <div>&nbsp;</div>
  <div>I suppose you could say if there is a carrier then some one is
in the shack but that's not really a QSO.</div>
  <div>&nbsp;</div>
  <div>I was hoping at the start of this exercise that a CW or other
PSK or similar real time&nbsp;QSO could be carried out over say
10/20kms.&nbsp;From the tests Chris G3XIZ has done the best looks like a
real time QSO would only happen over a 1.5km path cross town.<br>
  </div>
  </div>
[...]<br>
</blockquote>
Remember that i have detected my own CW transmission in a distance of
40.0 km (far field and above 1 Lambda) on 8970 Hz. Listen at
<a class="moz-txt-link-freetext" href="http://dl.dropbox.com/u/19882028/DK7FCinCWon8970Hzthe33kmband.WAV">http://dl.dropbox.com/u/19882028/DK7FCinCWon8970Hzthe33kmband.WAV</a><br>
So it is possible to do a CW QSO there. Distance is relative. While it
is trivial to do a QSO on 20m in 10000km distance it is something
special to reach 10km on VLF or on Laser-TX or 47 GHz and above.<br>
A VLF x band QSO in CW would have been done if there would be stations
in that radius of 40, maybe 60 km who would be willing and equipped to
receive my signal...<br>
<br>
73, Stefan/DK7FC<br>
<br>
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