The One-Mile Telescope used three steerable 60-foot dishes: two fixed, one rail-mounted. The movable–fixed pairs supplied two baselines simultaneously. Twelve-hour tracks at successive rail positions sampled projected spacings. Phase-switching receivers measured in-phase and quadrature correlations; adjustable delay and phase rotation compensated tracking.[ref]
The Operation of the Cambridge One-Mile Diameter Radio Telescope by Bruce Elsmore and others. Elsmore et al. (1966), sections 1–2, pp. 87–92, Figures 1–2
The readout was correlation versus time. Reference-phase subtraction should leave constant point-source phase; position offsets produce predictable variation. A source near the field's declination supplies a collimation check. Structure, instrumental error and sampling artefacts need separating.[ref]
The Operation of the Cambridge One-Mile Diameter Radio Telescope by Bruce Elsmore and others. Elsmore et al. (1966), section 4(a), p. 93; Appendix, p. 95
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