FSM & MSF is short for female seeking male and male seeking female, these acronyms are commonly used to describe someone in chat or on an online dating service who is looking for a partner.There is also FSF & MSM, which are short for female seeking female and male seeking male are also used.The other 59 (or, exceptionally, 60 or 58) seconds of the minute always begin with at least 100 ms 'off', followed by two data bits of 100 ms each, and end with at least 700 ms of carrier. Although two data bits are transmitted per second, the time code has the property that only one of them is variable; non-zero B bits are only transmitted when the corresponding A bit has a fixed value.
The 60 k Hz signal finally became an uninterrupted 24-hour service in 1966, and the frequency references were discontinued in February 1988.
The change in location and consequent change in signal strength can make some equipment designed to use the MSF signal fail to continue doing so.
While at Rugby, the transmitter generated 60 k W of radio frequency power (using 70 k W of mains power).
The 180m-high T-aerial antenna was 500m across at its top.
It consisted of 306 pulses in the five minutes up to and including and GMT, with a longer pulse at the start of each minute.
Frequency-shift keying was added in 1967, making the signal harder to use as a frequency reference.
The service is provided by Babcock International (with which former providers VT Communications merged) under contract to the NPL.
It was funded by the former Department for Business, Innovation and Skills; The signal, also known as the MSF signal (and formerly the Rugby clock), is broadcast at a highly accurate frequency of 60 k Hz and can be received throughout the UK, and in much of northern and western Europe.
The rise and fall times of the 60 k Hz carrier are determined by the combination of antenna and transmitter.
Each UTC second begins with 100 ms of 'off', preceded by at least 500 ms of carrier.
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