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From: Bob Raide <rjraide@hotmail.com>
To: "rsgb_lf_group@blacksheep.org" <rsgb_lf_group@blacksheep.org>
Date: Wed, 25 Sep 2013 20:50:12 -0400
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Subject: RE: LF: TA CW?
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Stefan=3B
If you get time can you show me where the sphericas electrode would be plac=
ed?  Maybe at the ant end?=20
I have figured you have 10 db on me on 137!  You are in here almost every n=
ight regardless of conditions!  What kind of ground system do you use?  May=
be ground  radials and how  long and about how many?=20
I see pictures of your 9 kHz gear and the land is flat and I would bet your=
 soil conductivity is very good.  That would help keep ground losses low an=
d helps greatly even for skywave propagation.
Bob
=20
Date: Thu=2C 26 Sep 2013 00:33:09 +0200
From: Stefan.Schaefer@iup.uni-heidelberg.de
To: rsgb_lf_group@blacksheep.org
Subject: Re: LF: TA CW?

=0A=
=0A=
=0A=
  =0A=
=0A=
=0A=
Hi Bob=2C=20
=0A=

=0A=
Am 25.09.2013 21:13=2C schrieb Bob Raide:=0A=
=0A=
  =0A=
  Stefan=3B
=0A=
The voltage is terrible!  I can draw a 2.5 inch flame off the ant input.=0A=
=0A=
I know hwat you mean. Similar problems here when i was setting up the=0A=
system here is 2011=2C see=0A=
https://dl.dropboxusercontent.com/u/19882028/LF/20111106-20h02m13s-FF7_8470=
.jpg=0A=
That was not even half the voltage i have to deal with now (a sphericas=0A=
electrode solved the problem=2C=0A=
https://dl.dropboxusercontent.com/u/19882028/LF/Electrode.JPG ).
=0A=

=0A=
=0A=
  More top loading would be great but also use this ant=0A=
for 80 and 160 meters.=20
=0A=
  =0A=
=0A=
And what is the problem? It is not Lambda/4 for these bands so you need=0A=
a matching network anyway=2C don't you?
=0A=

=0A=
=0A=
  You are probably using a much bigger ant than what I=0A=
have here. =0A=
=0A=
No=2C my antenna is smaller. It is an INV-L=2C 30m up and 70m long. The=0A=
effective height is 25m=2C about. The wire is 10mm diameter steel wire=0A=
(was designed to withstand a direct lightning strike). You see from the=0A=
image above that the isolator is quite heavy (takes 60 kN). 50 kV rms=0A=
in rain is no problem=2C however there are other regions where corona=0A=
discharges become visible=2C depending on the temperature and humidity.=0A=
What i do is keeping the earth losses extremely low! And i took RF litz=0A=
wire with 729 strands for the coil which has a Q of about 1000. Power=0A=
levels are rather moderate here=2C also because i'm running the TX all=0A=
the time when sleeping :-) You know=2C the best results to the west are=0A=
achieved at night!
=0A=

=0A=
73=2C Stefan/DK7FC=2C TXing WSPR-15 on LF again this night.=20
 		 	   		  =

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<body class=3D'hmmessage'><div dir=3D'ltr'>Stefan=3B<BR>If you get time can=
 you show me where the sphericas electrode would be placed?&nbsp=3B Maybe a=
t the ant end? <BR>I have figured you have 10 db on me on 137!&nbsp=3B You =
are in here almost every night regardless of conditions!&nbsp=3B What kind =
of ground system do you use?&nbsp=3B Maybe ground&nbsp=3B&nbsp=3Bradials an=
d how&nbsp=3B long and about how many? <BR>I see pictures of your 9 kHz gea=
r and the land is flat and I would bet your soil conductivity is very good.=
&nbsp=3B That would help keep&nbsp=3Bground losses low and helps greatly ev=
en for skywave propagation.<BR>Bob<br>&nbsp=3B<BR><div><hr id=3D"stopSpelli=
ng">Date: Thu=2C 26 Sep 2013 00:33:09 +0200<br>From: Stefan.Schaefer@iup.un=
i-heidelberg.de<br>To: rsgb_lf_group@blacksheep.org<br>Subject: Re: LF: TA =
CW?<br><br>=0A=
=0A=
=0A=
  =0A=
=0A=
=0A=
Hi Bob=2C <br>=0A=
<br>=0A=
Am 25.09.2013 21:13=2C schrieb Bob Raide:=0A=
<blockquote cite=3D"mid:BLU180-W8946AC700C2612B91A8472AC2F0@phx.gbl">=0A=
  <style><!--=0A=
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}=0A=
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font-size:12pt=3B=0A=
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  <div dir=3D"ltr">Stefan=3B<br>=0A=
The voltage is terrible!&nbsp=3B I can draw a 2.5 inch flame off the ant in=
put.</div>=0A=
</blockquote>=0A=
I know hwat you mean. Similar problems here when i was setting up the=0A=
system here is 2011=2C see=0A=
<a class=3D"ecxmoz-txt-link-freetext" href=3D"https://dl.dropboxusercontent=
.com/u/19882028/LF/20111106-20h02m13s-FF7_8470.jpg" target=3D"_blank">https=
://dl.dropboxusercontent.com/u/19882028/LF/20111106-20h02m13s-FF7_8470.jpg<=
/a>=0A=
That was not even half the voltage i have to deal with now (a sphericas=0A=
electrode solved the problem=2C=0A=
<a class=3D"ecxmoz-txt-link-freetext" href=3D"https://dl.dropboxusercontent=
.com/u/19882028/LF/Electrode.JPG" target=3D"_blank">https://dl.dropboxuserc=
ontent.com/u/19882028/LF/Electrode.JPG</a> ).<br>=0A=
<br>=0A=
<blockquote cite=3D"mid:BLU180-W8946AC700C2612B91A8472AC2F0@phx.gbl">=0A=
  <div dir=3D"ltr">More top loading would be great but also use this ant=0A=
for 80 and 160 meters. <br>=0A=
  </div>=0A=
</blockquote>=0A=
And what is the problem? It is not Lambda/4 for these bands so you need=0A=
a matching network anyway=2C don't you?<br>=0A=
<br>=0A=
<blockquote cite=3D"mid:BLU180-W8946AC700C2612B91A8472AC2F0@phx.gbl">=0A=
  <div dir=3D"ltr">You are probably using a much bigger ant than what I=0A=
have here.&nbsp=3B</div>=0A=
</blockquote>=0A=
No=2C my antenna is smaller. It is an INV-L=2C 30m up and 70m long. The=0A=
effective height is 25m=2C about. The wire is 10mm diameter steel wire=0A=
(was designed to withstand a direct lightning strike). You see from the=0A=
image above that the isolator is quite heavy (takes 60 kN). 50 kV rms=0A=
in rain is no problem=2C however there are other regions where corona=0A=
discharges become visible=2C depending on the temperature and humidity.=0A=
What i do is keeping the earth losses extremely low! And i took RF litz=0A=
wire with 729 strands for the coil which has a Q of about 1000. Power=0A=
levels are rather moderate here=2C also because i'm running the TX all=0A=
the time when sleeping :-) You know=2C the best results to the west are=0A=
achieved at night!<br>=0A=
<br>=0A=
73=2C Stefan/DK7FC=2C TXing WSPR-15 on LF again this night. <br></div> 		 	=
   		  </div></body>
</html>=

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