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Gee System Navigation Trainer
TX Type 48 (UK)
Gee Trainer
Type
48 was a low-power ground-based Gee navigation transmitter designed for
practice training of war-time RAF Navigators in the use of the Gee
navigation
system.
The use of
this equipment enabled Navigators to practice receiving the Gee signals
and plotting their position without the need to spend time aloft in
valuable aircraft, consuming scarce fuel.
Gee was a
hyperbolic VHF radio navigation system for aircraft that was evolved by
British scientists to
meet the needs of the RAF during World War II, at a time when both
Bomber Command and Coastal Command faced serious navigation
difficulties.
Gee allowed an
aircraft or ship to determine its position by measuring the time delay
between two received radio signals. The Gee system used three
transmitters (one master and two slaves) that were sited about 50 to
100 miles (60 to 160 kilometres) from each other, and transmitted on
frequencies in the band 25-85 MHz. The transmitters sent out pulsed
radio signals in a four part cycle, with each sequence spaced one
millisecond apart.
The signals
were typically received by an R1355 receiver, displayed on the
screen of a cathode ray tube indicator 62A and then the location
determined by reference to special charts.
The Gee navigation system remained
operational
until 1970.
The equipment is shown here with the Duxford
Radio Society Gee system test bench under going soak testing.
More details to
follow.
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