Morse training set, enabling instructor to simulate ‘real’ radio link by changing received signal strength and introducing ‘atmospheric’ noise.
Used by the British military during WW2. Designated Training Sets W.T. MK. III, ZA 21137.
Used by the IDF during the War of Independence (1948).
Power supply: 2 Volts battery for vacuum tube filaments, 90 Volts battery for vacuum tubes high voltage.
Vacuum tubes technology.
