CADF (UHF) by my time, Danny, and I remember being as inpressed as your USAF Colonel seeing it briefly in use for the first time. Any transmission from an aircraft resulted in an immediate trace appearing on the screen pointing to a graduated bezel around the screen's circumference and hence showing the bearing.
As a matter of interest, how did that work on a QGH? Did the controller have to do all the mental work of translating a True Bearing into a Magnetic Steer, taking account of Drift, or was some of it done for him by the kit? That a Controlled Descent Through Cloud could be obtained by merely keying one's T/R switch when called for just left me, well...Speechless!
Oh, this might be of interest, very "period" anyway:-
Ronaldsway Air Traffic Control in the 1950s