In practice, confirming annually is recommended. The process requires every licence holder to confirm or update the details on the Ofcom licence database. It is important to be registered with and be able to access the Ofcom Online Licensing System. This enables revalidation, amendments and other functions including Exam-pass and Special Event callsign applications. If you are not registered, once you become invalid and exceed a cooling-off period, your callsign becomes potentially available for reassignment to others. If you need further assistance in the process, Ofcom staff are available to help, but please be patient during times of heavy workload.
Common Amateur Filing Task: Changing Address
Hamdata FCC Information
In broadcasting and radio communications , a call sign also known as a call name or call letters —and historically as a call signal —or abbreviated as a call is a unique designation for a transmitter station. The use of call signs as unique identifiers dates to the landline railroad telegraph system. Because there was only one telegraph line linking all railroad stations , there needed to be a way to address each one when sending a telegram. In order to save time, two-letter identifiers were adopted for this purpose. This pattern continued in radiotelegraph operation; radio companies initially assigned two-letter identifiers to coastal stations and stations aboard ships at sea. These were not globally unique, so a one-letter company identifier for instance, 'M' and two letters as a Marconi station was later added.
Amateur Call Sign Systems
Don Schimmel's Radio Intrigue. Joe Carr's Tech Notes. Frequency vs. Modes and Modulation.
Call signs in United Kingdom include a three letter country code, and a series of letters and numbers. It assigns call signs, issues amateur radio licences, allots frequency spectrum, and monitors the radio waves. Ofcom is no longer responsible for setting and conducting amateur radio exams, which are now run by the Radio Society of Great Britain on their behalf. The society's patron is Prince Philip , Duke of Edinburgh, and it represents the interests of the UK's licensed radio amateurs.