David, Mike, Chris,
Thanks for the insight and links. I also found this:
https://www.qsl.net/pe1ngz/airforce/...ml#Lucero%20II
Quote:
Lucero II
RAF designation ARI 5645
Function
Lucero is a homing, beam approach and IFF interrogator for use with H2S, ASV and AI. It uses the IF amplification stages of the equipment with which it is used and also the display appears on the CRT of the parent equipment. Due to this inter-connection and also to the fact that different marks of the equipment to be interrogated have different carrier frequencies, several variations of Lucero have been produced. The TR 3566A. which here is briefly described, is the Bomber and Coastal Command version, the same basic set being used by both commands. Push-button frequency selector is used by Bomber Command. while Coastal use a functional selector switch.
Year of issue 1944
Type of wave Pulse modulated
Pulse width 5 microseconds
Pulse recurrence frequency 217 c/s
Frequency range
Range Transmitter Receiver
1 171-181 (177) Mc/s 171-181 (176) Mc/s
2 212-226 168-178
3 222-236 210-238
4 222-236 220-238
Main items
Transmitter Receiver TR 3566
Power unit 532
Receiving unit 161
Switch unit type 115
transmitter unit type 105
Waveform generator type 3C
Control unit type 222A
Remarks
Used by Bomber Command and Fleet Air Arm.
Developed for 1.7 meter beacons by 9 and 3 cm radar (H2S and ASV Mk VI)
some versions switchable to two Eureka channels.
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PS: ARI stands for Air Radio Installation, a designation system created by the British Air Ministry for the installations of radio equipment in the late 1930s, each number reflected the standardised installation of a particular radio transmitter or receiver and all the various elements including power units, aerial connections, and control panels etc.
During the war the range of radio equipment multiplied and the installations of all kinds of various receivers and transmitters such as radars and homing devices, radio altimeters and intelligence-gathering signals receivers were added to the list. The system seems to have been in use until at least the late 1980s/early 1990s.