Telecommunications – Receiver or analog modulated signal frequency converter – With wave collector
Patent
1987-10-01
1990-03-06
Griffin, Robert L.
Telecommunications
Receiver or analog modulated signal frequency converter
With wave collector
455191, 455188, 455180, 3581911, H03J 500, H04B 118, H04N 544
Patent
active
049072927
ABSTRACT:
A television tuner for three frequency ranges (I, II, III) comprises a common antenna connection (4) for corresponding input filter circuits. The input filter circuits (1, 2, 3) of the two higher frequency ranges can be connected to and disconnected from the antenna connection by means of switches (11, 12). The switches (11, 12) are each located between the antenna connection (4) and the associated input filter circuit (2, 3). To improve matching of the input filter circuit (3) and to simplify the configuration of the circuit, the antenna connection (4) is arranged in the proximity of an input filter circuit (1, 2) of the two lower-frequency frequency ranges (I, II). In addition, the switch (12) for the highest frequency range (III) is connected to the end of a coupling conductor (5) which is spaced closest to the antenna connection (4). Both ends of the coupling conductor (5') are connected to ground by means of a respective capacitor (5a, 5b) and the coupling conductor is coupled with an input circuit conductor (6') of the input filter circuit (3) of the highest frequency range (III).
REFERENCES:
patent: 3903487 (1975-09-01), Maier
patent: 4215372 (1980-07-01), Suzuki
patent: 4291290 (1981-09-01), Ijichi et al.
patent: 4555808 (1985-11-01), Fujimoto
patent: 4598423 (1986-07-01), Hettiger
patent: 4612571 (1986-09-01), Moon
patent: 4736456 (1988-04-01), Maier
Griffin Robert L.
Smith Ralph E.
Telefunken electronic GmbH
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