ricardian (#12163),
All I know about radios is the on-off button. In the Spitfires and Hurricanes I flew in 1942, we had a TR9 (HF), but it was not much good and we didn't use it at all. There were far too many aircraft in circuit to attempt any ATC - it was "every man for himself". In the Spitfire it lived in a top fuselage compartment behind my head.
In the postwar Mk.XVIs, we had an eight-button VHF job. Don't know what TR it was.
Danny.