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Date: Thu, 18 Apr 2002 11:44:44 +0100
To: rsgb_lf_group@blacksheep.org
From: "James Moritz" <j.r.moritz@herts.ac.uk>
Subject: Re: LF: Re: New QTH anyone?
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At 23:12 17/04/2002 +1000, you wrote:
>Also, I assume it only transmits for 5 minutes every six hours, is that
>correct ?
>
>Thanks ............... Zim

Dear Zim, LF group,

Nomally it transmits continuously 24 hours a day. The signal is MSK and has 
a bandwidth of about 100Hz, actually centered on 15.98kHz. According to the 
MSF web pages, MSF on 60kHz has been shut down intermittently recently for 
running repairs - I think  the MSF antenna is slung from some of the GBR 
antenna masts, so the same cause might be responsible for GBR being shut 
down lately. I don't know if GBR is on today - I'll have to check later.

The "other" VLF site apart from Rugby is at Criggion in Wales - if you are 
passing by, it is worth going to see. The road passes between the 6 masts 
and underneath the VLF antenna, one side of which is anchored to a nearby 
cliff. According to the sign on the gate, this is also operated by BT. 
Perhaps VLF operations will shift there - I expect the land is worth less.

The 3rd VLF site in the UK I know of is at Anthorn on the banks of the 
Solway Firth, as Dave mentioned - but this is usually referred to as being 
a NATO station; I don't know what the difference is. If you look on an 
Ordanance Survey map of the area, you can see the distinctive star-shaped 
pattern of masts.

Cheers, Jim Moritz
73 de M0BMU