Return to KLUBNL.PL main page

rsgb_lf_group
[Top] [All Lists]

Re: LF: VLF earth antenna article in wiki

To: <[email protected]>
Subject: Re: LF: VLF earth antenna article in wiki
From: "Dave Brown" <[email protected]>
Date: Mon, 28 Jun 2010 00:59:10 +1200
References: <[email protected]><BF4A524700075746A6467658DFC7102C5107CB12AB@ICTS-S-EXC2-CA.luna.kuleuven.be><BF4A524700075746A6467658DFC7102C5107CB12AD@ICTS-S-EXC2-CA.luna.kuleuven.be><[email protected]><[email protected]><[email protected]><[email protected]><38A51B74B884D74083D7950AD0DD85E82A1C66@File-Server-HST.hst.e-technik.tu-darmstadt.de><[email protected]><[email protected]><38A51B74B884D74083D7950AD0DD85E82A1C68@File-Server-HST.hst.e-technik.tu-darmstadt.de> <[email protected]>
Reply-to: [email protected]
Sender: [email protected]

Not directly relevant, given its size, but interesting for comparison purposes.


************************************************************
ELF, VLF and LF radiation from a very large loop antenna with a 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 0950-107X), vol. 140, no. 2, p. 129-134.


Abstract: Abstract The establishment of an LF/VLF/ELF transmitting facility at the Homer tunnel near Milford South in the South Island of New Zealand is described. The antenna consisted of a 3.3 km-long PVC-covered aluminium conductor passing through the tunnel and over the mountain above, forming a large vertical loop antenna. Measurements of the electric field radiated from the transmitter, recorded at both Lauder and Palmerston, 133 and 225 km from the transmitter site, respectively, are presented. The antenna radiation pattern derived from observations made onboard an Orion aircraft circling the antenna at a distance of 200 km is also presented. Theoretical models are derived which enable fits to the radiated field data to be made over a wide frequency range (0.5-40 kHz). With 1 kW of input power the antenna produced peak radiated fields at frequencies near 10 kHz equivalent to those of a vertical monopole source radiating 150 mW.
****************************************************************


I have a hard copy of this article somewhere but cant find it at present. The reference should be enough to find it in a university library. Publication date was circa 1993, IIRC.

73
DaveB, NZ
ZL3FJ




----- Original Message ----- From: "Roger Lapthorn" <[email protected]>
To: <[email protected]>
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, 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 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=sib_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 sort of array and connected by 165 miles of cable (this info can be read in the book
  extract on Amazon!).
  - ELF Communications
Antennas<http://www.amazon.co.uk/Elf-Communications-Antennas-Electromagnetic-Waves/dp/0906048001/ref=sr_1_23?ie=UTF8&s=books&qid=1277624698&sr=1-23>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 copies at the University Library here in Cambridge. Usually such texts are highly mathematical whereas what I need is a good overview which could be easily
grasped without too much maths.

73s
Roger G3XBM

2010/6/26 Stefan Schäfer <[email protected]>

Hi Roger, VLF,

Today Markus gave me the hint of an (at least for me) most interesting article in wikipedia. It is about a "earth" antenna like we have it in principle and it shows that it can indeed compete with a traditional marconi antenna. Maybe you know that since 10s of years but for me it was new:

http://en.wikipedia.org/wiki/Herzogstand_Radio_Station

or in german

http://de.wikipedia.org/wiki/Funkstation_am_Herzogstand (more detailed and
with a picture of the antenna construction)



73, Stefan/DK7FC




--
http://g3xbm-qrp.blogspot.com/
http://www.g3xbm.co.uk
http://www.youtube.com/user/g3xbm
G3XBM    GQRP 1678      ISWL G11088


<Prev in Thread] Current Thread [Next in Thread>