In late 1937, Maurice Elie at SFR developed a means of pulse-modulating transmitter tubes.
2.
AFN France broadcast in 50-watts, frequency modulated transmitters purchased from a French manufacturer ( TRT ), type OZ 305.
3.
A 60-MHz ( 5.0-m ) pulse-modulated transmitter was soon built; this generated 10-microsecond pulses with a wait-time of 90 microseconds between pulses.
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