Telecommunications – Transmitter – Amplitude modulation
Patent
1987-07-31
1989-03-28
Caldwell, Sr., John W.
Telecommunications
Transmitter
Amplitude modulation
455120, 455121, 455125, 334 78, 334 83, H03C 152, H01Q 1112, H04B 104
Patent
active
048171930
ABSTRACT:
A radio frequency transmitter, amplitude modulated, having a single tuner that tunes the frequency oscillator, the isolating filter and the antenna impedance, all at the same time. The transmitter includes a tunable carrier generator for generating a carrier signal of a desired frequency, and a carrier isolator for filtering the carrier signal so as to ensure a clean, isolated carrier signal. A power amplifier is included for amplifying the signal from the carrier isolator. The power amplifier has a certain output impedance. An antenna is connected for transmitting the amplified signal from the power amplifier. The antenna also has a certain impedance. The transmitter further includes an impedance matching device connected between the antenna and the power amplifier for matching the antenna impedance and the power amplifier impedance. Finally, a single control knob is provided for simultaneously controlling the tunable carrier generator, the carrier isolator and the impedance matching device. Thus, any particular setting of this control knob corresponds to a predetermined value of each of the tunable carrier generator, the carrier isolator and the impedance matching device.
REFERENCES:
patent: 2498078 (1950-02-01), Harrison
patent: 2894208 (1959-07-01), Crow
patent: 3464015 (1969-08-01), Brabham
patent: 4203063 (1980-05-01), Loeb et al.
patent: 4541119 (1985-09-01), Cooper et al.
Caldwell Sr. John W.
Queen Tyrone
Realty Electronics, Inc.
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