VHF/UHF band switching tuner including a second diode in band sw

Details VHF/UHF band switching tuner including a second diode in band sw VHF/UHF band switching tuner including a second diode in band sw

1982-09-30

1986-08-19

LaRoche, Eugene R.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

334 1, 334 47, 334 56, H04B 116, H03J 524

Patent

active

046073914

ABSTRACT:
A band switching circuit for a tuner for receiving VHF and UHF channels comprises a tuning circuit including a switching diode having an anode and a cathode for band switching, a plurality of resistors connected to the anode and cathode of the switching diode to thereby form a series-connected circuit, and a second diode connected in the series-connected circuit in a direction opposite to that of the switching diode. The switching diode can be forward-biased or reverse-biased for receiving the VHF channels, and can be disconnected from a DC power supply for receiving the UHF channels.

REFERENCES:
patent: 4189678 (1980-02-01), Sakamoto et al.
patent: 4291290 (1981-09-01), Ijichi et al.
patent: 4326295 (1982-04-01), Matsumoto

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