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From: "Talbot Andrew" <ACTALBOT@dera.gov.uk>
To: rsgb_lf_group@blacksheep.org
Subject: LF: RE:Rugby site
Date: Fri, 12 Jan 2001 09:02:07 -0000
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Allegedly and without predjudice, as long as certain people want to
exist safely underneath the sea, Rugby and Criggion will remain.  The
phase stabilisation Alan mentions allows, amongst other things, the
remote monitoring of transmitter health from remote sites .  Who said
that ?!  :-||

According to Tom Clancy, in "The Hunt for Red October"  there is a
transmission of coded groups to very deep operating "Boomers" at a data
rate that appears to be in the region of a bit per second (one minute
per message). The groups would encode messages such as "Come to the
surface immediately for a satellite transmission", or "Fire !". If it is
not all a fiction invented by an author with a large collection of
friends working at interesting places. Speculatively of course, this
would be at a frequency in the 60 - 170Hz region - which makes even
amateur 9kHz experiments seem tame.   It is stated that in the US there
are lines looking like old fashioned telegraph wires many hundreds
(1000s ?) of km long carrying signals that make fences spark.   

At these frequencies a ground loop antenna is the only realistic sort of
antenna that could be made to operate with reasonable efficiency and
long low slung wires which wouldn't have to even be grounded at the far
end if long enough would form just such an antenna -    Some people have
suggested - and this is no sxcrxt - that the UK tried some propagation
tests at ULF (Ultra Low Frequency,   30 - 300Hz or shold this be SLF) in
the 1960s, but decided we didn't need the deep operations around the
world this would allow.  I was told once (by someone long retired from
the business)  that there were ideas to use the third rail of the
railway network to form the antenna for a ULF transmission, others
proposed the National Grid but the idea of a multiplexer to separate
50Hz from the transmitting freq (at say 100 Hz) would be 'interesting'

Anon G^JN*

> If anyone can arrange a visit to Rugby Radio Station before 
> it all goes the
> same way I am sure there would be plenty of takers.
> 
> Cheers de Alan G3NYK
>


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