at Saxa Vord on 27 September 1957, was declared operational on 5 October 1957, and in 1960 was visited by Queen Elizabeth II. During this period the Type 14 was retained as a backup system until September 1964, whilst the Type 13 remained the primary height finder until 1978/79. The Type 80 was lost when it was blown away on 26 January 1961 and rebuilt inside a new radome. At the time, Saxa Vord consisted of three sites: the domestic site, the technical site (with the radars) and the married quarters called Setters Hill Estate (SHE). In the early days, the site was shared with the Royal Navy. Linesman era While the system was being built, serious concerns emerged over the introduction of the carcinotron, a new type of radar jammer that rendered the Type 80 almost useless. A new network using anti-jamming radars was introduced, the Linesman/Mediator system. In the new network, there was no point in Saxa attempting to remain operational against jammers, so it retained its Type 80 while other stations in the chain were upgraded with the new AMES Type 84 and AMES Type 85. Linesman ran into significant delays, and entered service in limited form in 1973, years later than planned. By 1976, the Type 80 had been in operation for decades and was long overdue for a replacement for maintenance reasons alone. This led to the introduction of a AMES Type 96 (Marconi S649), which had two radar aerials mounted back-to-back, one operating at D band and the other at F and E bands (three transmitters/receivers in total). The decades-old Type 13 was replaced by the newer Plessey HF200 in the height-finder role. In 1984 the station was renamed from No. 91 Signals Unit to Royal Air Force Saxa Vord. The signals unit badge was adopted by the station and it continued with the motto of Praemoneo de periculis (Latin for I give advanced warning about danger). IUKADGE era By the time Linesman was operational it was considered outdated; much of the equipment was based on decades-old designs, and built using components that were no longer available. Even before it was declared operational the decision had been made to replacing it as soon as possible, A new system, IUKADGE, emerged during a several-year definition process. The system was implemented at Saxa Vord in 1993. This was part of NATO-wide upgrades and the funding for