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References: <11250.89514.qm@web28501.mail.ukl.yahoo.com> <4D1DC897.2060606@iup.uni-heidelberg.de>
Date: Fri, 31 Dec 2010 12:49:17 +0000 (GMT)
From: Chris Osborn <g3xiz@yahoo.co.uk>
To: rsgb_lf_group@blacksheep.org
In-Reply-To: <4D1DC897.2060606@iup.uni-heidelberg.de>
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Subject: Re: LF: VLF - G3XIZ
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Thanks for all suggestions and comments.

I quickly wound in and then rewired the aerial reel with heavier copper wi=
re.
As Mal says the original wire was just too fine to work with.

I'm using 10 inch helium- filled  party balloons - 8 at present.
Intermediately placed balloons seems a good idea to spread the loading but=
 they=20
touch the aerial wire and then burst.

Again I'm up to 50m almost vertical with no wind.
The aerial current is ok too at 0.15 - 0.2A
I can tune the system by winding in/out the aerial wire but must remember=
 to=20
turn off the TX first - ouch!

I'm on QRSS 60 for a while but will revert to QRSS 600 soon


73
Chris G3XIZ


________________________________
From: Stefan Sch=E4fer <schaefer@iup.uni-heidelberg.de>
To: rsgb_lf_group@blacksheep.org
Sent: Fri, 31 December, 2010 12:12:07
Subject: Re: LF: VLF - G3XIZ

Chris,=20

This sounds good. Trying in 600 is a good starting point and a 50m vertica=
l is=20
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=20
is causing resistive losses and lower the ERP. Thus it is better to use a=
 bigger=20
wire, maybe 0,5mm. But then the weight could become a problem. Anyway, its=
 sound=20
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=20
rms.

Sadly i am not near my grabber PC in Heidelberg and cannot move the window=
 to=20
your frequency but before there will be a reception in Germany there will=
 be a=20
reception in UK at farer distances what will be satisfying for you i assum=
e ;-)=20
Just like in my tests your personal ODX should rise in "small" steps since=
 this=20
is causing the most fun :-)

73 and good luck!

Stefan/DK7FC

Am 31.12.2010 12:38, schrieb Chris Osborn:=20
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
>
>


     =20

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<html><head><style type=3D"text/css"><!-- DIV {margin:0px;} --></style></h=
ead><body><div style=3D"font-family:arial,helvetica,sans-serif;font-size:1=
0pt"><div>Thanks for all suggestions and comments.<br><br>I quickly wound=
 in and then rewired the aerial reel with heavier copper wire.<br>As Mal=
 says the original wire was just too fine to work with.<br><br>I'm using=
 10 inch helium- filled&nbsp; party balloons - 8 at present.<br>Intermedia=
tely placed balloons seems a good idea to spread the loading but they touc=
h the aerial wire and then burst.<br><br>Again I'm up to 50m almost vertic=
al with no wind.<br>The aerial current is ok too at 0.15 - 0.2A<br>I can=
 tune the system by winding in/out the aerial wire but must remember to tu=
rn off the TX first - ouch!<br><br>I'm on QRSS 60 for a while but will rev=
ert to QRSS 600 soon<br></div><div style=3D"font-family: arial,helvetica,s=
ans-serif; font-size: 10pt;"><br>73<br>Chris G3XIZ<br><div style=3D"font-f=
amily: times new   roman,new york,times,serif; font-size: 12pt;"><font fac=
e=3D"Tahoma" size=3D"2"><hr size=3D"1"><b><span style=3D"font-weight: bold=
;">From:</span></b> Stefan Sch=E4fer &lt;schaefer@iup.uni-heidelberg.de&gt=
;<br><b><span style=3D"font-weight: bold;">To:</span></b> rsgb_lf_group@bl=
acksheep.org<br><b><span style=3D"font-weight: bold;">Sent:</span></b> Fri=
, 31 December, 2010 12:12:07<br><b><span style=3D"font-weight: bold;">Subj=
ect:</span></b> Re: LF: VLF - G3XIZ<br></font><br>


 =20

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 type=3D"cite">
 =20
  <div style=3D"font-family: arial,helvetica,sans-serif; font-size: 10pt;"=
>
  <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>
  </div>
  </div>
  <br>
</blockquote>
</div></div>
</div><br>



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