More modern aviation ADFs contain a small array of fixed aerials and use electronic sensors to deduce the direction using the strength and phase of the signals from each aerial.
2.
Instead of fixed aerials there was a rotary scanner, and thus the return signals gave a visual trace through 360 degrees on a CRT known as the Plan Position Indicator ( PPI ).
3.
Besides the gunnery students, Buckingham AAF was also the primary training center for gunnery instructors at the Army's other flexible gunnery schools, the term meaning that the aerial gunner had a flexible mount at the station or in the turret of the aircraft, rather than the fixed aerial gun of fighter aircraft.
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