In article , Dave
Liquorice writes
On Fri, 17 Oct 2003 17:20:27 +0100, PoP wrote:

They use low frequency ...

Very Low Frequency, VLF, 16kHz.

... to communicate with submarines on the other side of the world
from Northwood in north London (the signal might go out from Rugby
though - I don't know the details).

The time standard, MSF, on 60kHz is the only signal transmitted from
the BT site at Rugby now. I think most of the masts have or are about
to be removed apart from the single MSF mast.

Don't they transmit Radio4 LW still from there? (also isn't it actually
Droitwich rather than Rugby?)
--
Tim Mitchell