Radio telephone apparatus

Details Radio telephone apparatus Radio telephone apparatus

1989-02-28

1991-09-10

Kuntz, Curtis

Telecommunications

Transmitter and receiver at same station

With a common signal processing stage

455 90, 455127, 455343, H04B 104, H04B 116

Patent

active

050481177

ABSTRACT:
A portable telephone apparatus which is capable of being selectively connected to an adaptor unit for transmitting a radio frequency (RF) signal at a certain power level in response to a level control signal. The telephone apparatus includes an amplifier for amplifying the RF signal by a predetermined amplification factor and an antenna for radiating the amplified RF signal. An operator actuatable switch is coupled to the output of the amplifier and is selectively coupled to the antenna and the adaptor unit. A control device is coupled to the amplifier and the operator actuatable switch and is responsive to the level control signal for controlling the amplifier so that the amplification factor of the amplifier is fixed to a predetermined level when the operator actuatable switch is in a first state and to a variable level when the actuatable switch is in a second state.

REFERENCES:
patent: 4511761 (1985-04-01), Yamazaki et al.
patent: 4636741 (1987-01-01), Mitelaff
patent: 4726052 (1988-02-01), Kato et al.
patent: 4852147 (1989-07-01), Suzuki et al.
patent: 4893348 (1990-01-01), Andoh
patent: 4920557 (1990-04-01), Umemoto

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