Quote:
Originally Posted by arcimedes
Originally back in the late sixties you would have heard a pulse every second with a longer one on the minute. This was changed later to a continuous signal interrupted every second and a longer one on the minute. Additional information was also encoded in the transmission. I think one was the offset from the second as transmitted to the second that navigators to find their position.
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Thanks- you know I think I heard this as a schoolboy when playing around with my first transistor radio!
Quote:
Originally Posted by Ignitionnet
It's one of the criteria that our tactical submarine force uses to assess whether or not the UK has been victim to a nuclear attack, and hence when to open the envelope containing the letter each PM writes when they take up office telling them what to do in the event of the destruction of the UK.
Obviously other forces have a somewhat more 'interactive' and clear view of the world situation hence don't need such fail-safes. The submarines sit incommunicado for months on end.
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Interesting- thanks for the added perspective
. Are you ex forces?