Message-ID: <24d701cb15f8$8ae139c0$7900a8c0@athlon1200>
From: "Dave Brown" <tractorb@ihug.co.nz>
To: <rsgb_lf_group@blacksheep.org>
References: <AANLkTilgENTZiwZLuNfcfEIiATdr-6mR4dOtJi7OV23p@mail.gmail.com><BF4A524700075746A6467658DFC7102C5107CB12AB@ICTS-S-EXC2-CA.luna.kuleuven.be><BF4A524700075746A6467658DFC7102C5107CB12AD@ICTS-S-EXC2-CA.luna.kuleuven.be><AANLkTinAnSB2BcAMGEsdzF3oKRrJIi0UUFXNZtylzdQO@mail.gmail.com><BLU146-W18A88B1CE28254F1F22301CFC50@phx.gbl><4C23FC42.8040204@iup.uni-heidelberg.de><AANLkTikURHV_pW8FesPysRE4uUEODc7sw2SgaSMnjNMG@mail.gmail.com><38A51B74B884D74083D7950AD0DD85E82A1C66@File-Server-HST.hst.e-technik.tu-darmstadt.de><4C25AE1F.7060807@gmx.com><AANLkTilGCHzFqIHUNkNd_dFGBweTGQ7_q10mT4h_fq-x@mail.gmail.com><38A51B74B884D74083D7950AD0DD85E82A1C68@File-Server-HST.hst.e-technik.tu-darmstadt.de> <AANLkTilhkk8WUVrxgA54ipLBGAp8G8BaaYLfh3mPKntI@mail.gmail.com>
Date: Mon, 28 Jun 2010 00:59:10 +1200
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Subject: Re: LF: VLF earth antenna article in wiki
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Not directly relevant, given its size, but interesting for comparison=
=20
purposes.


************************************************************
ELF, VLF and LF radiation from a very large loop antenna with a=20
mountain core

Author:  Barr, R. Ireland, W. Smith, M.J.
Nat. Inst. of Water & Atmos. Res., Lower Hutt ;

IEE Proceedings, Part H - Microwaves, Antennas and Propagation (ISSN=
=20
0950-107X), vol. 140, no. 2, p. 129-134.


Abstract:  Abstract The establishment of an LF/VLF/ELF transmitting=20
facility at the Homer tunnel near Milford South in the South Island of=
=20
New Zealand is described. The antenna consisted of a 3.3 km-long=20
PVC-covered aluminium conductor passing through the tunnel and over=20
the mountain above, forming a large vertical loop antenna.=20
Measurements of the electric field radiated from the transmitter,=20
recorded at both Lauder and Palmerston, 133 and 225 km from the=20
transmitter site, respectively, are presented. The antenna radiation=
=20
pattern derived from observations made onboard an Orion aircraft=20
circling the antenna at a distance of 200 km is also presented.=20
Theoretical models are derived which enable fits to the radiated field=
=20
data to be made over a wide frequency range (0.5-40 kHz). With 1 kW of=
=20
input power the antenna produced peak radiated fields at frequencies=
=20
near 10 kHz equivalent to those of a vertical monopole source=20
radiating 150 mW.
****************************************************************


I have a hard copy of this article somewhere but cant find it at=20
present. The reference should be enough to find it in a university=20
library. Publication date was circa 1993, IIRC.

73
DaveB, NZ
ZL3FJ




----- Original Message -----=20
From: "Roger Lapthorn" <rogerlapthorn@gmail.com>
To: <rsgb_lf_group@blacksheep.org>
Sent: Sunday, June 27, 2010 7:52 PM
Subject: Re: LF: VLF earth antenna article in wiki


I agree about the Wiki antenna: it is strung between the mountains,=20
not
using buried electrodes.

Maybe we dreamers need to consult some textbooks on ELF/VLF antennas?
Another data source should be any publicly available papers about=20
Project
Sanguine antennas. IEEE Antennas and Propagation may have had some
references in the 1970s or 80s?

   - Military Communications: From Ancient Times to the 21st
Century<http://www.amazon.co.uk/gp/product/1851097325/ref=3Dsib_rdr_dp=
>talks
about the Wisconsin Project Sanguine antennas being 14 miles long and
   mounted on 40 foot poles. This was for 76Hz. These were in some=20
sort of
   array and connected by 165 miles of cable (this info can be read in=
=20
the book
   extract on Amazon!).
   - ELF Communications
Antennas<http://www.amazon.co.uk/Elf-Communications-Antennas-Electroma=
gnetic-Waves/dp/0906048001/ref=3Dsr_1_23?ie=3DUTF8&s=3Dbooks&qid=3D127=
7624698&sr=3D1-23>by
Burrows is an IEE publication that must contain some useful
information.

Unfortunately these can be expensive to buy but I may be able to read=
=20
copies
at the University Library here in Cambridge.  Usually such texts are=
=20
highly
mathematical whereas what I need is a good overview which could be=20
easily
grasped without too much maths.

73s
Roger G3XBM

2010/6/26 Stefan Sch=E4fer <schaefer@hst.tu-darmstadt.de>

> Hi Roger, VLF,
>
> Today Markus gave me the hint of an (at least for me) most=20
> interesting
> article in wikipedia. It is about a "earth" antenna like we have it=
=20
> in
> principle and it shows that it can indeed compete with a traditional=
=20
> marconi
> antenna. Maybe you know that since 10s of years but for me it was=20
> new:
>
> http://en.wikipedia.org/wiki/Herzogstand_Radio_Station
>
> or in german
>
> http://de.wikipedia.org/wiki/Funkstation_am_Herzogstand (more=20
> detailed and
> with a picture of the antenna construction)
>
>
>
> 73, Stefan/DK7FC
>
>


--=20
http://g3xbm-qrp.blogspot.com/
http://www.g3xbm.co.uk
http://www.youtube.com/user/g3xbm
G3XBM    GQRP 1678      ISWL G11088