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. This paper gives an inside view of the first 20 years of operation of theKiruna–Sodankylä–Tromsø (KST) part of EISCAT as experienced andremembered by myself. The paper is subdivided into an Introduction and 14 additional sections. Sections 2 to 7 describe the organisation, staffing andresponsibilities of the sites, with particular emphasis on thetransmitter-related work at Tromsø and the commuting of staff andequipment between the sites. The headquarters operation is treated inSect. 8. The UHF radar system is treated in Sect. 9. Section 10 is areview of the VHF system, including a summary of transmitter and antennaproblems not available elsewhere in easily accessed media. Section 11 treatsthe computer system and the proprietary control languages EROS, TARLAN andCORLAN. Section 12 describes the signal processing hardware, with specialemphasis on the Alker correlator, its idiosyncrasies and the gradualunlocking of its capabilities through UNIPROG, the GEN system and theG2 system, culminating in the ability to run alternating code experimentsroutinely. Section 13 presents the time and frequency keeping, anon-trivial task in the early 1980s. Finally, Sect. 14 discusses the UHFspectrum problem and relates how the UHF system had to be constantlyupgraded in order to be able to co-exist with the emerging mobile phonenetworks until the final closure of UHF reception at Kiruna andSodankylä in 2012. The paper ends with some personal reflections(Sect. 15).

History of EISCAT – Part 5: Operation and development of the system during the first 2 decades