Later developments made it possible to run an organ from a single radio frequency oscillator.
2.
Phased-array antennas became practical with the introduction of tunable high-power coherent radio frequency oscillators in the 1960s.
3.
It was Peddie who encouraged Watson-Watt to study radio, or " wireless telegraphy " as it was then known and who took him through what was effectively a postgraduate class of one on the physics of radio frequency oscillators and wave propagation.
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