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From: Laurence KL7UK <hellozerohellozero@hotmail.com>
To: <rsgb_lf_group@blacksheep.org>
Date: Mon, 10 Oct 2011 13:27:54 -0800
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Subject: LF: Hummm....
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One of the surprising things about the heavily indistrial and compact Islan=
d of Singapore was the lack of Hum at VLF - even in the middle of the city =
in some of the Greener areas VLF reception was really very good with only m=
ild Humm=2C even surrounded by building.  Again most of the power was under=
ground=2C the water table was very close to the surface and most of the hig=
h rise HDB buildings were off Faraday cage type with Earthed rebar. Guess i=
t all added up to an effective screen.
=20
If I compare that with here in Oklahoma where Ive yet to find a location (e=
xcept for weak humm in the middle the Tall Grass Praire reservation surroun=
ded by Bison) its really noisy at 60Hz here dominated by overhead 60Hz ante=
nnae. (Where I live in Alaska is pretty bad too)
=20
=20
Laurence KL7UK/5 Northern Okie

=20

> Date: Mon=2C 10 Oct 2011 21:52:04 +0200
> From: Stefan.Schaefer@iup.uni-heidelberg.de
> To: rsgb_lf_group@blacksheep.org
> Subject: Re: LF: mains wires
>=20
> Ah BTW=2C here all the power distribution up to 20 kV is below the ground=
=2C=20
> i.e. in cables=2C since the 60's. Some over-land wires are still existing=
=20
> in the country-side though. In Berlin=2C they even use short (some km)=20
> 400kV cables to bring the electricity in the center of the city. In the=20
> cities you don't find any cables at all above ground.
>=20
> 73=2C Stefan
>=20
 		 	   		  =

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One of the surprising things about the heavily indistrial and compact Islan=
d of Singapore was the lack of Hum at VLF - even in the middle of the city =
in some of the Greener areas VLF reception was really very good with only m=
ild Humm=2C even surrounded by building. &nbsp=3BAgain most of the power wa=
s underground=2C the water table was very close to the surface and most of =
the high rise HDB buildings were off Faraday cage type with Earthed rebar. =
Guess it all added up to an effective screen.<BR>
&nbsp=3B<BR>
If I compare that with here in Oklahoma where Ive yet to find a location (e=
xcept for weak humm in the middle the Tall Grass Praire reservation surroun=
ded by Bison) its really noisy at 60Hz here dominated by overhead 60Hz ante=
nnae. (Where I live in Alaska is pretty bad too)<BR>
&nbsp=3B<BR>
&nbsp=3B<BR>
Laurence KL7UK/5 Northern Okie<BR>
<BR>&nbsp=3B<BR>
<DIV>
&gt=3B Date: Mon=2C 10 Oct 2011 21:52:04 +0200<BR>&gt=3B From: Stefan.Schae=
fer@iup.uni-heidelberg.de<BR>&gt=3B To: rsgb_lf_group@blacksheep.org<BR>&gt=
=3B Subject: Re: LF: mains wires<BR>&gt=3B <BR>&gt=3B Ah BTW=2C here all th=
e power distribution up to 20 kV is below the ground=2C <BR>&gt=3B i.e. in =
cables=2C since the 60's. Some over-land wires are still existing <BR>&gt=
=3B in the country-side though. In Berlin=2C they even use short (some km) =
<BR>&gt=3B 400kV cables to bring the electricity in the center of the city.=
 In the <BR>&gt=3B cities you don't find any cables at all above ground.<BR=
>&gt=3B <BR>&gt=3B 73=2C Stefan<BR>&gt=3B <BR></DIV> 		 	   		  </div></bod=
y>
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