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References: <11250.89514.qm@web28501.mail.ukl.yahoo.com> <4D1DC897.2060606@iup.uni-heidelberg.de> <76636.6973.qm@web28508.mail.ukl.yahoo.com> <1567AC3A96624647ADC1F52EF1A1E625@JimPC> <4D1E0C5D.9000608@iup.uni-heidelberg.de>
Date: Fri, 31 Dec 2010 17:39:31 +0000 (GMT)
From: Chris Osborn <g3xiz@yahoo.co.uk>
To: rsgb_lf_group@blacksheep.org
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Subject: Re: LF: VLF - G3XIZ
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Many thanks Stefan,

I believe that Jim is about 38 km distant and I will check.
The signal Jim received was certainly on the correct frequency and the rig=
ht=20
time to have been me

That's a good idea about using the inverted 'L' and balloon aerial in para=
llel;=20
I shall try that.

My big concern with balloon aerials here is that should the wire touch a=
=20
neighbour's TV aerial
I imagine that his TV, radio, stereo etc will go zap!
The balloons soon deflate and the wire starts to sag so I have to keep a=
=20
constant watch on it.
I am pretty much surrounded by tall trees or houses and the wind is consta=
ntly=20
varying in direction.

I may try more balloons next time and get a bit more lift.
They were not especially expensive and 50 balloons and a disposable canist=
er of=20
helium gas was
only =A332 on E-Bay.

73 Chris
G3XIZ




________________________________
From: Stefan Sch=E4fer <schaefer@iup.uni-heidelberg.de>
To: rsgb_lf_group@blacksheep.org
Sent: Fri, 31 December, 2010 17:01:17
Subject: Re: LF: VLF - G3XIZ

Congratulations to the new record Chris, Jim,

What is the exact distance? Some 10 km i think. http://no.nonsense.ee/qthm=
ap/

Chris, can't you use the inv-L and the balloon antenna in parallel? This=
 lowers=20
the voltage and needed L, so less losses. And you can make QRO without=20
increasing the HV problems. If you come back to the same antenna voltage,=
 you=20
will surely improve the ERP! And the resonance is rather less affected by=
 the=20
vertical antenna movement due to wind since the inv-L part stays constant!
If you increase the wire length to 60m (limit in UK) you would increase th=
e=20
efficiency by up to 50% and lower the voltage by 20%!
Nice success just some minutes before 2011 :-)

73, GL, Stefan/DK7FC




Am 31.12.2010 14:54, schrieb James Moritz:
> Dear Chris, LF Group,
>=20
> I seem to have a trace on your frequency - see attachment. SNR is curren=
tly=20
>around 15dB with 1.5millihertz FFT resolution. It definitely wasn't there=
 before=20
>;-)
>=20
> Cheers, Jim Moritz
> 73 de M0BMU=20


     =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>Many thanks Stefan,<br><br>I believe that Jim is about 38 km dis=
tant and I will check.<br>The signal Jim received was certainly on the cor=
rect frequency and the right time to have been me<br><br>That's a good ide=
a about using the inverted 'L' and balloon aerial in parallel; I shall try=
 that.<br><br>My big concern with balloon aerials here is that should the=
 wire touch a neighbour's TV aerial<br>I imagine that his TV, radio, stere=
o etc will go zap!<br>The balloons soon deflate and the wire starts to sag=
 so I have to keep a constant watch on it.<br>I am pretty much surrounded=
 by tall trees or houses and the wind is constantly varying in direction.<=
br><br>I may try more balloons next time and get a bit more lift.<br>They=
 were not especially expensive and 50 balloons and a disposable canister=
 of helium gas
 was<br>only =A332 on E-Bay.<br><br>73 Chris<br>G3XIZ<br></div><div style=
=3D"font-family: arial,helvetica,sans-serif; font-size: 10pt;"><br><div st=
yle=3D"font-family: arial,helvetica,sans-serif; font-size: 13px;"><font fa=
ce=3D"Tahoma" size=3D"2"><hr size=3D"1"><b><span style=3D"font-weight: bol=
d;">From:</span></b> Stefan Sch=E4fer &lt;schaefer@iup.uni-heidelberg.de&g=
t;<br><b><span style=3D"font-weight: bold;">To:</span></b> rsgb_lf_group@b=
lacksheep.org<br><b><span style=3D"font-weight: bold;">Sent:</span></b> Fr=
i, 31 December, 2010 17:01:17<br><b><span style=3D"font-weight: bold;">Sub=
ject:</span></b> Re: LF: VLF - G3XIZ<br></font><br>Congratulations to the=
 new record Chris, Jim,<br><br>What is the exact distance? Some 10 km i th=
ink. <a href=3D"http://no.nonsense.ee/qthmap/" target=3D"_blank">http://no=
.nonsense.ee/qthmap/</a><br><br>Chris, can't you use the inv-L and the bal=
loon antenna in parallel? This lowers the voltage and needed L, so less lo=
sses. And you can make QRO
 without increasing the HV problems. If you come back to the same antenna=
 voltage, you will surely improve the ERP! And the resonance is rather les=
s affected by the vertical antenna movement due to wind since the inv-L pa=
rt stays constant!<br>If you increase the wire length to 60m (limit in UK)=
 you would increase the efficiency by up to 50% and lower the voltage by=
 20%!<br>Nice success just some minutes before 2011 :-)<br><br>73, GL, Ste=
fan/DK7FC<br><br><br><br><br>Am 31.12.2010 14:54, schrieb James Moritz:<br=
>&gt; Dear Chris, LF Group,<br>&gt; <br>&gt; I seem to have a trace on you=
r frequency - see attachment. SNR is currently around 15dB with 1.5millihe=
rtz FFT resolution. It definitely wasn't there before ;-)<br>&gt; <br>&gt;=
 Cheers, Jim Moritz<br>&gt; 73 de M0BMU <br><br></div></div>
</div><br>



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