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equisignal
equisignal adj. 
/ˌɛkwᵻˈsɪɡnl/, /ˌɛkwiˈsɪɡn(ə)l/, /ˌikwəˈsɪɡn(ə)l/, /ˌikwiˈsɪɡn(ə)l/ Aeronautics of a radio beacon or guidance system of overlapping zones (see quot. 1951).
Brit. /ˌiːkwᵻˈsɪɡnl/
, /ˌiːkwᵻˈsɪɡnl//ˌɛkwᵻˈsɪɡnl/U.S. /ˌɛkwəˈsɪɡn(ə)l/
, /ˌɛkwəˈsɪɡn(ə)l//ˌɛkwiˈsɪɡn(ə)l//ˌikwəˈsɪɡn(ə)l//ˌikwiˈsɪɡn(ə)l/ΚΠ
1931 P. V. H. Weems Air Navigation xiv. 273 A radio beam is broadcast by transmitters known as equi-signal beacons. Transmitters employ two cross-loops, radiating a characteristic dot-and-dash signal.
1936 Jrnl. Royal Aeronaut. Soc. 40 172 The system of directional equi-signal beacons established to mark the chain of air routes throughout the U.S.A.
1951 Gloss. Aeronaut. Terms (B.S.I.) iii. 31 Equi-signal zone, a zone within which, with an overlapping signal pattern system, indication is given that an aircraft is on a track.
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