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From: Bob Raide <rjraide@hotmail.com>
To: "rsgb_lf_group@blacksheep.org" <rsgb_lf_group@blacksheep.org>
Date: Thu, 26 Dec 2013 12:58:16 -0500
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In-Reply-To: <52BC683B.5030107@iup.uni-heidelberg.de>
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Subject: RE: VLF: 8969.99
Sender: owner-rsgb_lf_group@blacksheep.org
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Reply-To: rsgb_lf_group@blacksheep.org
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Stefan=3B
If I go to VLF I am going to add to my existing inductance outside.  I plan=
 to make a box using "plexiglass" quarter inch thick with glued seams so is=
 weather proof.  It will be clear [no color] and is very good dielectric.  =
I was going to ask you how much clearance I need and 30 cm is about 1 foot =
or 12 inches clearance around the coil.  Leave air gap around bottom so air=
 can circulate so you don't build up moisture.  Small muffin fan with shrou=
d to pull fresh air up and around coil and out.
Could even use clear vinyl material .025 thick and a clear vinyl box over a=
 plastic pipe frame would be cheaper.  Clear vinyl used for side curtains o=
n boats-etc.=20
I am in sewing business [make boat and truck covers] so could make you cove=
r and you build the frame-I ship clear vinyl cover UPS to you or you could =
have local canvas company make it.  Use "RTV" over stitches to make water t=
ight-Bob
=20
Date: Thu=2C 26 Dec 2013 18:32:43 +0100
From: Stefan.Schaefer@iup.uni-heidelberg.de
To: rsgb_lf_group@blacksheep.org
Subject: Re: VLF: 8969.99

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

=0A=
Of course=2C if the coil is protected against rain=2C then it is no=0A=
problem. But the coil is quite large and due to the high voltage=2C the=0A=
housing should ideally have a distance of 30cm or more to the coil. So=0A=
the housing must be quite large=2C even more. And that makes it dangerous=
=0A=
because of wind blasts on the to of the building in 35m AGL...=20
=0A=
Anyway it would be nice and i also thought about using a simple foil=0A=
across the coil=2C without additional distance.=20
=0A=
However on LF=2C there are partial discharges on the top of the coil=0A=
which burns holes into the protecting foil. And the VLF winding is=0A=
2000m long. It is a lot of effort to repair it after a short cut=0A=
between some turns due to arcing. So it is a high risk.=20
=0A=
I think i will make a test in the near future and see if 9 kHz partial=0A=
discharges are as agressive as 137 kHz partial discharges :-)
=0A=
73=2C Stefan/DK7FC
=0A=

=0A=
Am 26.12.2013 16:32=2C schrieb Bob Raide:=0A=
=0A=
  =0A=
  Stefan=3B
=0A=
Even if you have your coils in weather proof housing rain is no good to=0A=
transmit on 9 kHz? Bob
=0A=
=20
=0A=
  =0A=
  Date: Thu=2C 26 Dec 2013 13:55:11 +0100
=0A=
From: Stefan.Schaefer@iup.uni-heidelberg.de
=0A=
To: rsgb_lf_group@blacksheep.org
=0A=
Subject: Re: VLF: 8969.99
=0A=
 =20
=0A=
Hi Uwe=2C Tom=2C VLF=2C
=0A=
 =20
=0A=
Best signal ever from Tom=2C capture attached. Is it due to the=0A=
propagation or did it improve your signal?
=0A=
What about some tests in OPDS32 or maybe JT9-30? Unfortunately there is=0A=
permanent rain here so i have to wait some days longer.
=0A=
 =20
=0A=
73=2C Stefan/DK7FC=0A=
  =0A=
 		 	   		  =

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<body class=3D'hmmessage'><div dir=3D'ltr'>Stefan=3B<BR>If I&nbsp=3Bgo to V=
LF I am going to add to my existing inductance outside.&nbsp=3B I plan to m=
ake a box using "plexiglass" quarter inch thick with glued seams so is weat=
her proof.&nbsp=3B It will be clear [no color] and is very good dielectric.=
&nbsp=3B I was going to ask you how much clearance I need and 30&nbsp=3Bcm =
is about 1 foot or 12 inches clearance around the coil.&nbsp=3B Leave air g=
ap around bottom so air can circulate so you don't build up moisture.&nbsp=
=3B Small muffin fan with shroud to pull fresh air up and around coil and o=
ut.<BR>Could even use clear vinyl material&nbsp=3B.025 thick and&nbsp=3Ba&n=
bsp=3Bclear vinyl box over&nbsp=3Ba plastic pipe frame would be cheaper.&nb=
sp=3B Clear vinyl used for side curtains on boats-etc. <BR>I am in sewing b=
usiness [make boat and truck covers] so could make you cover and you build =
the frame-I ship clear vinyl cover UPS to you or you could have local canva=
s company make it.&nbsp=3B Use "RTV" over stitches to make water tight-Bob<=
br>&nbsp=3B<BR><div><hr id=3D"stopSpelling">Date: Thu=2C 26 Dec 2013 18:32:=
43 +0100<br>From: Stefan.Schaefer@iup.uni-heidelberg.de<br>To: rsgb_lf_grou=
p@blacksheep.org<br>Subject: Re: VLF: 8969.99<br><br>=0A=
=0A=
=0A=
  =0A=
=0A=
=0A=
Hi Bob=2C <br>=0A=
<br>=0A=
Of course=2C if the coil is protected against rain=2C then it is no=0A=
problem. But the coil is quite large and due to the high voltage=2C the=0A=
housing should ideally have a distance of 30cm or more to the coil. So=0A=
the housing must be quite large=2C even more. And that makes it dangerous=
=0A=
because of wind blasts on the to of the building in 35m AGL... <br>=0A=
Anyway it would be nice and i also thought about using a simple foil=0A=
across the coil=2C without additional distance. <br>=0A=
However on LF=2C there are partial discharges on the top of the coil=0A=
which burns holes into the protecting foil. And the VLF winding is=0A=
2000m long. It is a lot of effort to repair it after a short cut=0A=
between some turns due to arcing. So it is a high risk. <br>=0A=
I think i will make a test in the near future and see if 9 kHz partial=0A=
discharges are as agressive as 137 kHz partial discharges :-)<br>=0A=
73=2C Stefan/DK7FC<br>=0A=
<br>=0A=
Am 26.12.2013 16:32=2C schrieb Bob Raide:=0A=
<blockquote cite=3D"mid:BLU180-W62F434A4CCA435DECB293EACC20@phx.gbl">=0A=
  <style><!--=0A=
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}=0A=
=0A=
--></style>=0A=
  <div dir=3D"ltr">Stefan=3B<br>=0A=
Even if you have your coils in weather proof housing rain is no good to=0A=
transmit on 9 kHz? Bob<br>=0A=
&nbsp=3B<br>=0A=
  <div>=0A=
  <hr id=3D"ecxstopSpelling">Date: Thu=2C 26 Dec 2013 13:55:11 +0100<br>=0A=
From: <a class=3D"ecxmoz-txt-link-abbreviated" href=3D"mailto:Stefan.Schaef=
er@iup.uni-heidelberg.de">Stefan.Schaefer@iup.uni-heidelberg.de</a><br>=0A=
To: <a class=3D"ecxmoz-txt-link-abbreviated" href=3D"mailto:rsgb_lf_group@b=
lacksheep.org">rsgb_lf_group@blacksheep.org</a><br>=0A=
Subject: Re: VLF: 8969.99<br>=0A=
  <br>=0A=
Hi Uwe=2C Tom=2C VLF=2C<br>=0A=
  <br>=0A=
Best signal ever from Tom=2C capture attached. Is it due to the=0A=
propagation or did it improve your signal?<br>=0A=
What about some tests in OPDS32 or maybe JT9-30? Unfortunately there is=0A=
permanent rain here so i have to wait some days longer.<br>=0A=
  <br>=0A=
73=2C Stefan/DK7FC</div>=0A=
  </div>=0A=
</blockquote></div> 		 	   		  </div></body>
</html>=

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