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.