Standard frequency and time signal service

Standard frequency and time signal service (short: SFTS) is, according to Article 1.53 of the International Telecommunication Union's (ITU) Radio Regulations (RR), "A radiocommunication service for scientific, technical and other purposes, providing the transmission of specified frequencies, time signals, or both, of stated high precision, intended for general reception". == Classification == In accordance with ITU Radio Regulations (article 1) variations of this radiocommunication service are classified as follows: Standard frequency and time signal service (article 1.53) Standard frequency and time signal-satellite service In general this radiocommunication service uses radio stations as follows: Standard frequency and time signal stations (article 1.95) == Standard frequency and time signal-satellite service == Standard frequency and time signal-satellite service (short: SFTSS) is, according to Article 1.54 of the International Telecommunication Union's (ITU) Radio Regulations (RR), defined as A radiocommunication service using space stations on earth satellites for the same purposes as those of the standard frequency and time signal service.

Source: Wikipedia — Standard frequency and time signal service (CC BY-SA 4.0)