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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