RE: LF: VLF earth antenna article in wiki [Criggion SK]

["Dave G3WCB" <ganymede444@btopenworld.com>]

Dear LF,

 

Criggion has gone, but Woofferton, just down the road near Ludlow, is still on air. Admittedly, Woofferton is an HF station not an LF station, and so is a bit off-topic for this group, but has lots of interesting big antennas and coils to admire nevertheless.

 

See link below.

 

http://www.bbceng.info/Operations/transmitter_ops/Reminiscences/Woofferton/woof50y-v2.pdf

 

73, Dave G3WCB

-----Original Message-----
From: owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_group@blacksheep.org]On Behalf Of M0FMT
Sent: 27 June 2010 09:36
To: rsgb_lf_group@blacksheep.org
Subject: Re: LF: VLF earth antenna article in wiki

Hi Group

 

Perhaps not so grand as Herzostand Station but WT Station Criggion was build in a bit of a hurry and used the side of a Welsh "mountain" as the far end achorage of the 16kc/s Antenna. Before its destruction in 2003 the station was entered via a Hanson slate quarry. I had the fun of working there not many years before that on a few occations adding 21st century EMP proof Fibre optic communication to a TX that use massive thermionic Valves!

http://www.oswestry-history.co.uk/criggion-radio-station.html

 

But as with all V / LF stations most of the RF went into the ground anyway.

73 es GL petefmt

I support www.NotSpotTelecom.Com your community Telco / ISP.

--- On Sun, 27/6/10, Roger Lapthorn <rogerlapthorn@gmail.com> wrote:

From: Roger Lapthorn <rogerlapthorn@gmail.com>
Subject: Re: LF: VLF earth antenna article in wiki
To: rsgb_lf_group@blacksheep.org
Date: Sunday, 27 June, 2010, 8:52

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 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 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 <schaefer@hst.tu-darmstadt.de>

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

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