US 4,057,760 AGranted

Frequency synthesized scanner having conductive programming elements for channel selection

AssigneeRegency Electronics, Inc.

InventorRichard C. Koch

Life of this patent

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Abstract

A multi-band radio receiver is disclosed for automatically and sequentially tuning to a plurality of discreet, separate preselected frequencies. The receiver incorporates a phase locked loop frequency synthesizer which includes two separate voltage tuned oscillators alternately operative according to the band of operation of the receiver. Channels are selected by inserting metal combs having teeth removed to form a binary coded memory into corresponding sockets in the receiver. One comb is used for each of the channels to which the receiver can tune. By replacing a specific comb with an alternate comb, the channel to which the receiver tunes can be correspondingly changed. The combs are made of relatively brittle aluminum in order that they may be readily programmed to the appropriate binary coded decimal arrangement of pins. Programming is accomplished by the simple bending and breaking of the appropriate teeth on the comb to achieve the desired binary coded information to achieve tuning to the desired frequency.

Claims7

Dependent claims

In a stepping radio receiver for production of audio signals from radio frequency signals and capable of tuning to several separate channels which radio receiver includes:

a. an RF signal receiving means, a mixer means, and and oscillator means;
b. said RF signal receiving means being for providing sufficient RF signal level for said mixer means;
c. said RF signal receiving means and said oscillator means being coupled to said mixer means;
d. an audio detection means coupled to said mixer means for producing an audio signal when an RF signal is being received, said audio detection means including squelch means for preventing the production of an audio signal when an RF signal is not being received:
e. said oscillator means being coupled to said mixer means and operable at a given several frequencies, there being one frequency for each channel to which the receiver can tune;
said oscillator means including a frequency synthesizer for determining the frequency of oscillation of said oscillator means;
f. said frequency synthesizer including:
1. voltage tuned oscillator means for providing an oscillator output frequency corresponding to a voltage present at its input,
2.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 05/694,016Filed 7 Jun 1976
Granted: 8 Nov 1977
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

H03L 7/0805
Details of the phase-locked loop: the loop being adapted to provide an additional control signal for use outside the loop
H03J 5/0272
Discontinuous tuning using an electrical variable impedance element, e.g. a voltage variable reactive diode, in which no corresponding analogue…:…
H03J 7/285
Using counters or frequency dividers: the counter or frequency divider being used in a phase locked loop
H03L 7/099
Details of the phase-locked loop: concerning mainly the controlled oscillator of the loop