Msf acronym dating
Bits 54B–57B provide odd parity over the time code.
The 4 parity bits cover years (8 bits), months and days (11 bits), day of week (3 bits), and time of day (13 bits) respectively.
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 signal’s carrier frequency is maintained at 60 k Hz to within 2 parts in 10 A radio station at Rugby was first operated by the Post Office from 1926, with the call-sign GBR.
Each UTC second begins with 100 ms of 'off', preceded by at least 500 ms of carrier.