Telecommunications – Transmitter – With feedback of modulated output signal
Patent
1994-03-14
1995-08-29
Urban, Edward F.
Telecommunications
Transmitter
With feedback of modulated output signal
455127, 330278, H04B 104
Patent
active
054469201
ABSTRACT:
A variable transmission power type transmitter comprises a transmission amplifier, a detecting circuit for detection of a transmission wave signal from the transmission amplifier, an automatic power control circuit for automatic control of the transmission power of the transmitter amplifier depending on the difference between a set value and a detected output of the detecting circuit, a set point providing circuit for generating set values and for selecting one of the set values to be supplied to the automatic power control circuit, and a transmission interruption detecting circuit for detecting existence or absence of the transmission wave signal by comparing the detected output of the detecting circuit with a reference value. The reference value is automatically generated from one of the set values in the set point providing circuit. Therefore, a variable resistor for adjusting the reference value and a adjustment process of the reference value are not required.
REFERENCES:
patent: 2924813 (1960-02-01), Meador
patent: 4395245 (1983-07-01), Mitama
patent: 4447783 (1984-05-01), Quick
patent: 4476437 (1984-10-01), Fujiwara
patent: 4574248 (1986-03-01), Snodgrass
patent: 4654882 (1987-03-01), Ikeda
patent: 4870698 (1989-09-01), Katsuyama et al.
Matsumoto Yoshihiro
Toda Yoshifumi
Fujitsu Limited
Urban Edward F.
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