Message-ID: <4D1DC897.2060606@iup.uni-heidelberg.de>
Date: Fri, 31 Dec 2010 13:12:07 +0100
From: =?UTF-8?B?U3RlZmFuIFNjaMOkZmVy?= <schaefer@iup.uni-heidelberg.de>
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To: rsgb_lf_group@blacksheep.org
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Subject: Re: LF: VLF - G3XIZ
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Chris,

This sounds good. Trying in 600 is a good starting point and a 50m 
vertical is fine too. How big are the balloons? Do you use helium or 
hydrogen? ;-)
Using 0.2mm diameter wire may cause some partial discharges 
("sparking"). This is causing resistive losses and lower the ERP. Thus 
it is better to use a bigger wire, maybe 0,5mm. But then the weight 
could become a problem. Anyway, its sound like the best system you run 
on VLF so far.
When running 0.15 A into a 50m vertical at 8970 Hz you should get about 
9 kV rms.

Sadly i am not near my grabber PC in Heidelberg and cannot move the 
window to your frequency but before there will be a reception in Germany 
there will be a reception in UK at farer distances what will be 
satisfying for you i assume ;-) Just like in my tests your personal ODX 
should rise in "small" steps since this is causing the most fun :-)

73 and good luck!

Stefan/DK7FC

Am 31.12.2010 12:38, schrieb Chris Osborn:
> The balloons are still holding up.
>
> I'm transmitting 'XIZ' at QRSS600
> QRG: 8.971 846 kHz
> The aerial current is down for some reason although the system's resonant.
>
> 73
> Chris G3XIZ
>

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Chris, <br>
<br>
This sounds good. Trying in 600 is a good starting point and a 50m
vertical is fine too. How big are the balloons? Do you use helium or
hydrogen? ;-)<br>
Using 0.2mm diameter wire may cause some partial discharges
("sparking"). This is causing resistive losses and lower the ERP. Thus
it is better to use a bigger wire, maybe 0,5mm. But then the weight
could become a problem. Anyway, its sound like the best system you run
on VLF so far.<br>
When running 0.15 A into a 50m vertical at 8970 Hz you should get about
9 kV rms.<br>
<br>
Sadly i am not near my grabber PC in Heidelberg and cannot move the
window to your frequency but before there will be a reception in
Germany there will be a reception in UK at farer distances what will be
satisfying for you i assume ;-) Just like in my tests your personal ODX
should rise in "small" steps since this is causing the most fun :-)<br>
<br>
73 and good luck!<br>
<br>
Stefan/DK7FC<br>
<br>
Am 31.12.2010 12:38, schrieb Chris Osborn:
<blockquote cite="mid:11250.89514.qm@web28501.mail.ukl.yahoo.com"   type="cite">
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  <div>The balloons are still holding up.<br>
  <br>
I'm transmitting 'XIZ' at QRSS600<br>
QRG: 8.971 846 kHz<br>
The aerial current is down for some reason although the system's
resonant.<br>
  <br>
73<br>
Chris G3XIZ<br>
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  <br>
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