Telecommunications – Transmitter and receiver at same station – With transmitter-receiver switching or interaction prevention
Patent
1991-01-30
1993-08-24
Eisenzopf, Reinhard J.
Telecommunications
Transmitter and receiver at same station
With transmitter-receiver switching or interaction prevention
455 74, H04B 144
Patent
active
052396886
ABSTRACT:
To permit use of a hand-held transceiver, such as a radio telephone, as a vehicular car telephone, and operation thereof via a car radio receiving antenna (10), an active multi-range antenna switch is connected between the antenna (10), the car radio (27) and the transceiver (29). The antenna is connected to the car radio (27) through a first channel (13) which includes a low-pass filter (15) and an amplifier; the antenna (10) is further connected to the radio telephone via a second channel (14) which includes a high-pass filter (17), an inter-channel modulation suppression filter (18), an amplifier (19) connected to amplify signals from the radio telephone, and a power sensing relay (20) which, when the transceiver (29) is in receiving mode, bridges or shunts the amplifier (19), but opens the switch when the transceiver is in a transmitting mode, to provide amplification of transmission signals from the transceiver or radio telephone. The active switch can be connected to the car battery (32) which can also be connected through a separable connector (31, 30) to the radio telephone so that, when used in the vehicle, it will not draw on its own internal power supply (35), but be powered from the car radio. The low-pass filer (15) has a cut-off frequency of, approximately, 108 MHz and blocks transmission of the radio telephone signals in the car radio, the high-pass filter (17) having a low frequency cut-off for example of also 108 MHz, transmitting, however, readily within the 400 MHz band for portable telephones.
REFERENCES:
patent: 4037177 (1977-07-01), Tyrey
patent: 4106025 (1978-08-01), Katz
patent: 4525863 (1985-06-01), Stites
patent: 4850034 (1989-07-01), Campbell
Elektor article "Citizen Band in a Car", Apr. 1980 issue 4, pp. 59-61 (CB im Auto).
Dorrie Horst
Militz Uwe
Eisenzopf Reinhard J.
Robert & Bosch GmbH
Urban Edward
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