Telecommunications – Transmitter – Amplitude modulation
Patent
1977-11-10
1982-02-02
Ng, Jin F.
Telecommunications
Transmitter
Amplitude modulation
332 38, H04B 104
Patent
active
043143741
ABSTRACT:
A high power amplitude modulated audio frequency transmitter having a Twin-T low frequency oscillator, a tickler coil high frequency oscillator, a switching regulator and a switching amplifier. The Twin-T low frequency oscillator produces a sine wave modulating signal which is fed to the switching regulator. The tickler coil high frequency oscillator produces a carrier signal which is fed to the input end of the switching amplifier. The output signal of the switching regulator is fed to the output end of the switching amplifier so that a sine wave modulated signal is developed on the output of the switching amplifier.
REFERENCES:
patent: 2282347 (1942-05-01), Taylor
patent: 3202940 (1965-08-01), Vietrick
patent: 3335370 (1967-08-01), Wittig
patent: 3413570 (1968-11-01), Bruene et al.
patent: 3449680 (1969-06-01), Schilb
patent: 3506920 (1970-04-01), Swanson
patent: 3514690 (1970-05-01), Quiros
patent: 3866148 (1975-02-01), Lisle, Jr.
patent: 3898590 (1975-08-01), Swanson
patent: 4085389 (1978-04-01), Kuroda
Chin Tommy P.
Ng Jin F.
Sotak J. B.
Westinghouse Air Brake Company
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