[time-nuts] MSF maintenance day

Peter Vince petervince1952 at gmail.com
Fri Mar 10 06:47:42 EST 2017


The "MSF" 60KHz time-signal transmitter in England has several scheduled
maintenance days each year when it is turned off for a few hours in the
middle of the day.  Yesterday was one such day, and I was curious to see
when and how quickly they would turn it off and on again, so recorded the
event using my WinRadio card, and a not very special aerial - so it is a
rather noisy signal.  Attached is a plot of both turn-on and turn-off -
note the different time-scales:

[image: Inline images 1]

It was turned off by reducing the power over about half a second, and then
curiously a few seconds later it bounced back at reduced power for a few
seconds.  When it was turned on again half an hour later, they slowly
ramped up the power over about a minute!

(Plots from screen-grabs of Audacity from the recorded CW tone.)

Peter Vince  (London, England)
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