ROA broadcasts the official time in Spain using the following methods:[1]
Transmission oftime signals inHF in two daily intervals of 25 minutes. From 10:00 UTC to 10:25 UTC on 15.006 MHz and from 10:30 UTC to 10:55 UTC on 4.998 MHz. The station is a Harris RF-130 with 1kW of power broadcasting from San Fernando (Cádiz). This is the only radio broadcast of official time in Spain as there is nolongwave station broadcasting time signals such asDCF77 fromGermany orMSF60 (also known asNPL) from theUnited Kingdom.
Via hotline (Phone number: +34 956 59 94 29), using a time information broadcasting protocol widely used in Europe (European Telephone Code Standard). Access is limited to two minutes per call and admits international calls.
NTP Protocol (Network Time Protocol), through two Internet servers placed in San Fernando and a third one placed in Madrid (NTP Servers: hora.roa.es and minuto.roa.es, both available through ntp.roa.es).
Timestamping. The ROA, as a TSA (Time Stamping Authority), provides a timestamping server for official certifications through a standard digital certificate x509 v3. This system is used by the whole public administration in Spain for timestamping their transactions. This service is available through theSARA Network (Sistema de Aplicaciones y Redes para las Administraciones).
