RWM is the callsign of three strong Russian time signal transmitter near Moscow. Post on several shortwave frequencies ( 4,996 MHz, 9,996 MHz and 14.996 MHz).
Because of their high emission power, they are in almost all Eurasia and about to receive also. But you do not send in continuous operation ( such as WWV in the United States and Hawaii), but alternating between the frequencies. The broadcast times are subject to change from time to time something. Half-day service breaks are switched several times a month.
The signals are short - tenths of a second and longer seconds points with special minutes identifier. As hours identifier is a coincidence signal.