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Date: Thu, 26 Sep 2013 00:33:09 +0200
From: =?ISO-8859-1?Q?Stefan_Sch=E4fer?= <Stefan.Schaefer@iup.uni-heidelberg.de>
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Subject: Re: LF: TA CW?
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Hi Bob,

Am 25.09.2013 21:13, schrieb Bob Raide:
> Stefan;
> The voltage is terrible!  I can draw a 2.5 inch flame off the ant input.
I know hwat you mean. Similar problems here when i was setting up the 
system here is 2011, see 
https://dl.dropboxusercontent.com/u/19882028/LF/20111106-20h02m13s-FF7_8470.jpg 
That was not even half the voltage i have to deal with now (a sphericas 
electrode solved the problem, 
https://dl.dropboxusercontent.com/u/19882028/LF/Electrode.JPG ).

> More top loading would be great but also use this ant for 80 and 160 
> meters.
And what is the problem? It is not Lambda/4 for these bands so you need 
a matching network anyway, don't you?

> You are probably using a much bigger ant than what I have here.
No, my antenna is smaller. It is an INV-L, 30m up and 70m long. The 
effective height is 25m, about. The wire is 10mm diameter steel wire 
(was designed to withstand a direct lightning strike). You see from the 
image above that the isolator is quite heavy (takes 60 kN). 50 kV rms in 
rain is no problem, however there are other regions where corona 
discharges become visible, depending on the temperature and humidity. 
What i do is keeping the earth losses extremely low! And i took RF litz 
wire with 729 strands for the coil which has a Q of about 1000. Power 
levels are rather moderate here, also because i'm running the TX all the 
time when sleeping :-) You know, the best results to the west are 
achieved at night!

73, Stefan/DK7FC, TXing WSPR-15 on LF again this night.

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Hi Bob, <br>
<br>
Am 25.09.2013 21:13, schrieb Bob Raide:
<blockquote cite="mid:BLU180-W8946AC700C2612B91A8472AC2F0@phx.gbl"
 type="cite">
  <style><!--
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  <div dir="ltr">Stefan;<br>
The voltage is terrible!&nbsp; I can draw a 2.5 inch flame off the ant input.</div>
</blockquote>
I know hwat you mean. Similar problems here when i was setting up the
system here is 2011, see
<a class="moz-txt-link-freetext" href="https://dl.dropboxusercontent.com/u/19882028/LF/20111106-20h02m13s-FF7_8470.jpg">https://dl.dropboxusercontent.com/u/19882028/LF/20111106-20h02m13s-FF7_8470.jpg</a>
That was not even half the voltage i have to deal with now (a sphericas
electrode solved the problem,
<a class="moz-txt-link-freetext" href="https://dl.dropboxusercontent.com/u/19882028/LF/Electrode.JPG">https://dl.dropboxusercontent.com/u/19882028/LF/Electrode.JPG</a> ).<br>
<br>
<blockquote cite="mid:BLU180-W8946AC700C2612B91A8472AC2F0@phx.gbl"
 type="cite">
  <div dir="ltr">More top loading would be great but also use this ant
for 80 and 160 meters. <br>
  </div>
</blockquote>
And what is the problem? It is not Lambda/4 for these bands so you need
a matching network anyway, don't you?<br>
<br>
<blockquote cite="mid:BLU180-W8946AC700C2612B91A8472AC2F0@phx.gbl"
 type="cite">
  <div dir="ltr">You are probably using a much bigger ant than what I
have here.&nbsp;</div>
</blockquote>
No, my antenna is smaller. It is an INV-L, 30m up and 70m long. The
effective height is 25m, about. The wire is 10mm diameter steel wire
(was designed to withstand a direct lightning strike). You see from the
image above that the isolator is quite heavy (takes 60 kN). 50 kV rms
in rain is no problem, however there are other regions where corona
discharges become visible, depending on the temperature and humidity.
What i do is keeping the earth losses extremely low! And i took RF litz
wire with 729 strands for the coil which has a Q of about 1000. Power
levels are rather moderate here, also because i'm running the TX all
the time when sleeping :-) You know, the best results to the west are
achieved at night!<br>
<br>
73, Stefan/DK7FC, TXing WSPR-15 on LF again this night. <br>
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