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Date: Sat, 07 May 2016 22:11:35 +0200
From: DK7FC <selberdenken@posteo.de>
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References: <40b8e5c6692149a7911fe77631ebb33b@kabelmail.de> <572BB679.2040107@posteo.de> <572BE449.5010806@abelian.org> <279E0DEFDAFA4C849152DBBA3BFEDE8C@White> <572C5E72.7010404@posteo.de> <912731037.20160506233059@mterrier.net> <572D1111.9030302@posteo.de> <572D9843.7060402@abelian.org> <572DBBD3.3020709@posteo.de> <572DC660.5050007@abelian.org>
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Subject: Re: VLF: EbNaut transmissions on lower frequencies?, pre-tests: 6.47kHz
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Hi Paul, VLF,

Am 07.05.2016 12:41, schrieb Paul Nicholson:
> I'll have a look now at your 6480 carrier to do some more
> adjustment.
There was another carrier from 09:45...19:45 UTC today on 6470 Hz.

> Continuing to try for your first message but I'm probably
> still 2 or 3dB short.
A real challenge! There will be more.

> The day/night phase change isn't a problem
Not? Oh, ok, so let me start another transmission:

*f = 6470.000 Hz
Start time: 07.05.2016   20:00:02 UTC
Period: 100 s
Length: 19
CRC 16
Coding 8K19A
Duration: 32h, 53m, 20s*
*Antenna current: 200 mA*

It is my longest transmission EVER! If this message comes through on the 
46 km band, it would be amazing (even more).
Then i would start to prepare the system for 5.17 kHz!
Currently i am output transformer limited :-) I need a new one for 5.17 
then. The spacing between the coils will be higher so i can run more 
antenna current, 280 mA again. So i need more voltage on a lower 
frequency. Calls for a larger ferrite core!

> interesting that it
> isn't less than at 8.27 kHz but it's complicated at these
> short ranges.
It's a distance of 19 lambda between us.

73, GL, Stefan

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Hi Paul, VLF,<br>
<br>
Am 07.05.2016 12:41, schrieb Paul Nicholson:
<blockquote cite="mid:572DC660.5050007@abelian.org" type="cite">I'll
have a look now at your 6480 carrier to do some more
  <br>
adjustment.
  <br>
</blockquote>
There was another carrier from 09:45...19:45 UTC today on 6470 Hz.<br>
<br>
<blockquote cite="mid:572DC660.5050007@abelian.org" type="cite">Continuing
to try for your first message but I'm probably
  <br>
still 2 or 3dB short.
  <br>
</blockquote>
A real challenge! There will be more.<br>
<br>
<blockquote cite="mid:572DC660.5050007@abelian.org" type="cite">The
day/night phase change isn't a problem</blockquote>
Not? Oh, ok, so let me start another transmission:<br>
<br>
<big><b>f = 6470.000 Hz<br>
Start time: 07.05.2016   20:00:02 UTC<br>
Period: 100 s<br>
Length: 19<br>
CRC 16<br>
Coding 8K19A<br>
Duration: 32h, 53m, 20s</b></big><br>
<big><b>Antenna current: 200 mA</b></big><br>
<br>
It is my longest transmission EVER! If this message comes through on
the 46 km band, it would be amazing (even more).<br>
Then i would start to prepare the system for 5.17 kHz!<br>
Currently i am output transformer limited :-) I need a new one for 5.17
then. The spacing between the coils will be higher so i can run more
antenna current, 280 mA again. So i need more voltage on a lower
frequency. Calls for a larger ferrite core!<br>
<br>
<blockquote cite="mid:572DC660.5050007@abelian.org" type="cite">
interesting that it
  <br>
isn't less than at 8.27 kHz but it's complicated at these
  <br>
short ranges.<br>
</blockquote>
It's a distance of 19 lambda between us.<br>
<br>
73, GL, Stefan<br>
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