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From: Bob Raide <rjraide@hotmail.com>
To: "rsgb_lf_group@blacksheep.org" <rsgb_lf_group@blacksheep.org>
Date: Thu, 26 Sep 2013 10:39:31 -0400
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Subject: RE: LF: TA CW?
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Stefan=3B
I will be putting out the chicken wire in couple weeks when mowing ends. It=
 will be interesting to see if there are any changes in ant resistance.  As=
 Alan sez "maybe nothing".
I agree that the top loading is what I need.  As much and as many wires as =
possible!
My main problem is this is a log house and wood garage!  Not good dwelling =
for serious LF work!
BTW=3B
I see this RSGB site is where all the action is-don't need anything more th=
an this!
Bob
=20
Date: Thu=2C 26 Sep 2013 13:34:04 +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 26.09.2013 01:00=2C schrieb Bob Raide:=0A=
=0A=
  =0A=
  Stefan=3B
=0A=
What kind of ground system do you use=0A=
=0A=
For me it was quite easy=2C i simply use the lightning protection system=0A=
of building so i just needed to connect the cold end of the coil to=0A=
that wire on the roof. Some of the walls of the building are metallic=0A=
and are connected to that earth system. The result is incredible!
=0A=

=0A=
=0A=
   and recommend?=20
=0A=
  =0A=
=0A=
As Alan says=2C it depends on your local situation. But usually ground=0A=
rods are better than radials=2C or more "efficient" (effort and result).=0A=
You have to measure what happens when you make a change in the system.=0A=
Then you see if it is worth to continue (e.g. adding another earth rode=0A=
in some distance).=20
=0A=

=0A=
Give me some more details. Now you're getting 9.5A antenna current at=0A=
74 kHz and 1.5 kW? That would be 16 Ohm total loss resistance=2C which is=
=0A=
quite good. And for 74 kHz=2C i assume your coil will cause a significant=
=0A=
part of the losses. What type of loading coil do you use? Photos?=0A=
You're only using that chicken wire and the well?=20
=0A=

=0A=
=0A=
   How you can confine all that power in such short=0A=
ant!!!  That insulator burns with that little flame all the time you=0A=
transmit-rain or shine?=0A=
=0A=
The insulator is ceramic and will survive every dirty experiment i'm=0A=
doing. No=2C there is no arcing any more since i applied that spheric=0A=
electrode (4 cm diameter) there. The arrangement acts as a spark gap in=0A=
case of a direct lightning strike=2C to protect the loading coil. The=0A=
lightning impulse withstand voltage of that spark gap (in the range of=0A=
80 kV  1.2/50) is lower than the one of the coil=2C so the coil will be=0A=
protected...
=0A=

=0A=
73=2C Stefan
 		 	   		  =

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<body class=3D'hmmessage'><div dir=3D'ltr'>Stefan=3B<BR>I will be putting o=
ut the chicken wire in couple weeks when mowing ends. It will be interestin=
g to see if there are any changes in ant resistance.&nbsp=3B As Alan sez "m=
aybe nothing".<BR>I agree that the top loading is what I need.&nbsp=3B As m=
uch and as many wires as possible!<BR>My main problem is this is a log hous=
e and wood garage!&nbsp=3B Not good dwelling for serious LF work!<BR>BTW=3B=
<BR>I&nbsp=3Bsee this RSGB site is where all the action is-don't need anyth=
ing more than&nbsp=3Bthis!<BR>Bob<br>&nbsp=3B<BR><div><hr id=3D"stopSpellin=
g">Date: Thu=2C 26 Sep 2013 13:34:04 +0200<br>From: Stefan.Schaefer@iup.uni=
-heidelberg.de<br>To: rsgb_lf_group@blacksheep.org<br>Subject: Re: LF: TA C=
W?<br><br>=0A=
=0A=
=0A=
  =0A=
=0A=
=0A=
Hi Bob=2C <br>=0A=
<br>=0A=
Am 26.09.2013 01:00=2C schrieb Bob Raide:=0A=
<blockquote cite=3D"mid:BLU180-W691AC260F75F27A648E24AC2F0@phx.gbl">=0A=
  <style><!--=0A=
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  <div dir=3D"ltr">Stefan=3B<br>=0A=
What kind of ground system do you use</div>=0A=
</blockquote>=0A=
For me it was quite easy=2C i simply use the lightning protection system=0A=
of building so i just needed to connect the cold end of the coil to=0A=
that wire on the roof. Some of the walls of the building are metallic=0A=
and are connected to that earth system. The result is incredible!<br>=0A=
<br>=0A=
<blockquote cite=3D"mid:BLU180-W691AC260F75F27A648E24AC2F0@phx.gbl">=0A=
  <div dir=3D"ltr"> and recommend? <br>=0A=
  </div>=0A=
</blockquote>=0A=
As Alan says=2C it depends on your local situation. But usually ground=0A=
rods are better than radials=2C or more "efficient" (effort and result).=0A=
You have to measure what happens when you make a change in the system.=0A=
Then you see if it is worth to continue (e.g. adding another earth rode=0A=
in some distance). <br>=0A=
<br>=0A=
Give me some more details. Now you're getting 9.5A antenna current at=0A=
74 kHz and 1.5 kW? That would be 16 Ohm total loss resistance=2C which is=
=0A=
quite good. And for 74 kHz=2C i assume your coil will cause a significant=
=0A=
part of the losses. What type of loading coil do you use? Photos?=0A=
You're only using that chicken wire and the well? <br>=0A=
<br>=0A=
<blockquote cite=3D"mid:BLU180-W691AC260F75F27A648E24AC2F0@phx.gbl">=0A=
  <div dir=3D"ltr"> How you can confine all that power in such short=0A=
ant!!!&nbsp=3B That insulator burns with that little flame all the time you=
=0A=
transmit-rain or shine?</div>=0A=
</blockquote>=0A=
The insulator is ceramic and will survive every dirty experiment i'm=0A=
doing. No=2C there is no arcing any more since i applied that spheric=0A=
electrode (4 cm diameter) there. The arrangement acts as a spark gap in=0A=
case of a direct lightning strike=2C to protect the loading coil. The=0A=
lightning impulse withstand voltage of that spark gap (in the range of=0A=
80 kV&nbsp=3B 1.2/50) is lower than the one of the coil=2C so the coil will=
 be=0A=
protected...<br>=0A=
<br>=0A=
73=2C Stefan<br></div> 		 	   		  </div></body>
</html>=

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