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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 19:00:07 -0400
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Subject: RE: LF: TA CW?
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Stefan=3B
What kind of ground system do you use and recommend?  I use chicken wire ra=
dials.  I roll it up when time to mow grass and let it out in October.  I h=
ave couple short ones out and one 150 footer.  Will have six more out soon.=
 =20
How you can confine all that power in such short ant!!!  That insulator bur=
ns with that little flame all the time you transmit-rain or shine?
=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>What kind of ground=
 system do you use and recommend?&nbsp=3B I use chicken wire radials.&nbsp=
=3B I roll it up when time to mow grass and let it out in October.&nbsp=3B =
I have couple short ones out and one 150 footer.&nbsp=3B Will have&nbsp=3Bs=
ix more out soon.&nbsp=3B <BR>How you can confine all that power in such sh=
ort ant!!!&nbsp=3B That insulator burns with that little flame all the time=
 you transmit-rain or shine?<br>&nbsp=3B<BR><div><hr id=3D"stopSpelling">Da=
te: Thu=2C 26 Sep 2013 00:33:09 +0200<br>From: Stefan.Schaefer@iup.uni-heid=
elberg.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=
.ExternalClass .ecxhmmessage P {=0A=
padding:0px=3B=0A=
}=0A=
=0A=
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font-size:12pt=3B=0A=
font-family:Calibri=3B=0A=
}=0A=
=0A=
--></style>=0A=
  <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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