Electronic channel selector

Details Electronic channel selector Electronic channel selector

1982-11-19

1984-10-23

Bookbinder, Marc E.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

334 15, 455 77, 455195, 455196, H04B 126

Patent

active

044792476

ABSTRACT:
Disclosed is an electronic channel selector comprising a plurality of diodes in series with a plurality of crystals, each diode/crystal connection defining one channel of the ten channel crystal-controlled oscillator. Non-enabled diodes are maintained in a reverse bias condition, preventing the associated crystal from oscillating in the oscillation circuit. The diode corresponding to the selected channel is forward biased into conduction permitting the associated crystal to control the oscillator circuitry providing the desired frequency output. When the selected diode is forward biased and begins conducting current, it conducts current through a path which provides a tuning voltage which may advantageously be utilized in a transmitter exciter filter or receiver preselector. A binary switch is manually set for the desired channel and produces a binary coded output. A binary-to-decimal decoder provides a single enabling output which is determined by the binary code supplied from the binary switch. The decoder output is inverted and forward biases the diode corresponding to the selected channel.

REFERENCES:
patent: 3824475 (1974-07-01), Pflasterer

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