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Radar-theodolite transponder, 1957-1959.

1950-1955

Wind finding transponder

Transponder for radar theodolite work

ABK-1 transponder, 1941

ABK-1 transponder, 1941

1941

MARAC-MF Intelligent Marine Transponder, Type A5102, by Geodata Systems Ltd. and Del Norte Technology Ltd., 1986. Cut-away section of tube to show transducer workings.

MARAC-MF Intelligent Marine Transponder, 1986

1986

I.F.F. Mark II transponder R3003, 1940-1943

I.F.F. Mark II transponder R3003

1940-1943

Demonstration transponder by NEC Corporation, Space and Laser Communication Development Division, Japan, 1984-86. Comprises: receiver, input multiplexer, up convertor, travelling-wave tube, output multiplexer and power supply (for travelling-wave tube).

Demonstration transponder by NEC, Japan, c 1985

1984-1986

C-Band TT and C transponder with two antennas from Inmarsat-2, by NEC Corporation, Space and Laser Communication Development Division, Japan 1984-86. Comprises: transponder, hybrid, telemetry coupler, coaxial switch, two antennas.

Transponders with antennas from Inmarsat-2, by NEC, Japan, c 1985

1984-1986