Comprises Kettering School log books 1966-1981, GE Perry's log books 1969-2000, and Sputnik 11 log books 1962-1965. The entries typically record the date, name of satellite, acquisition of signal, loss of signal, timings and details of signals heard, sometimes observers' initials, location of radio, and tape recorder numbers.

Additional early records of observations are integrated within GE Perry's files of satellite launches (organised by launch site and inclination) and within other early files of Kettering Group satellite studies.