Control unit for transceiver

Claim 2

A control unit for a transceiver comprising: (a) a housing sized to be conveniently held in one hand, (b) a transmit/receive switch, a gain control, and a squelch control, each mounted within the housing and operable therefrom, each being electrically connected over a multi-conductor cord to said transceiver for remote control of the transceiver, (c) an electroacoustic transducer, mounted within the housing and electrically connected to the transceiver through the multi-connector cord, (d) a frequency selecting means mounted within the housing for selecting any one of a number of preset operating frequencies, the frequency selecting means comprising: (1) a programmable random access memory (RAM) for storing codes indicative of each of the preset operating frequencies, (2) a read only memory (ROM) having a first output connected to the RAM for controlling access to the stored codes, (3) a switching circuit connected to the RAM and the ROM for switching the selected stored code to a phase-looped locked (PLL) driving circuit connected to the transceiver through said multi-connector cord, (4) a binary up/down counter connected to an input of the ROM for indexing the ROM through the operating frequencies, (5) an up/down circuit, connected to one input of the binary up/down counter and operated by manually actuated up/down switches for manually selecting the desired preselected operating frequency, and (6) a vacant channel selecting circuit and clock oscillator connected to another input of the binary up/down counter for automatically scanning and selecting a vacant operating frequency on which the transceiver might operate, and (e) a channel number display means situated with its display surfaces exposed out of said housing and connected to the switching circuit of the frequency selecting means for displaying the channel number of the selected operating frequency.

Claim 3

Control unit of claim 1 wherein the channel number display means is selected from the group consisting of a liquid crystal display and a fluorescent-display tube.

Claim 4

Control unit of claim 1, wherein the electroacoustic transducer means functions both as a speaker and as a microphone.

Claim 5

Control unit of claim 1 wherein the transmit/receive switch means comprises a switch each contact of which is staggered with respect a mating contact such that the electroacoustic transducer means functions as a microphone after the transceiver is brought to transmitting condition and the transceiver returns to receiving condition after the electroacoustic transducer means ceases to function as a microphone.

Claim 6

Control unit of claim 1, wherein an amplifier and an electrical filter are connected to the output side of the electroacoustic transducer means which is employed as a microphone.

Claim 7

Control unit of claim 1, wherein the electroacoustic transducer means consists of a speaker and a microphone as separate units.

Claim 8

Control unit of claim 1, wherein the housing is equipped with a switch means for writing in and reading out a channel to be used.

Claim 9

Control unit of claim 1, wherein the housing is equipped with a switch means which switches the transceiver between its use as a public address system and its proper use as a transceiver.

Claim 10

Control unit of claim 1 wherein the channel selecting means further comprises a switch means to lock onto a channel to be used by stopping the oscillation of said clock oscillator.

Claim 11

Control unit of claim 1, wherein the electroacoustic transducer means consists of a microphone and a speaker as separate units, the microphone being held in the housing and the speaker being set separate from the housing.

Claim 12

Control unit of claim 1 wherein the frequency selecting means further comprises a LED drive circuit connected between said switching circuit and said channel number display means and wherein the channel number display means is an LED display.

Claim 13

Control unit of claim 11, wherein the display surface of the channel number display means is provided with an optical filter which facilitates the recognition of the display.

Claim 14

Control unit of claim 1, wherein the housing is equipped with a transmit/receive level display means to confirm the transmit/receive condition of the transceiver.

Claim 15

Control unit of claim 13, wherein the transmit/receive level display means consists of LED.

Claim 16

Control unit of claim 13, wherein the transmit/receive level display means consists of a moving coil type meter.

Claim 17

A transceiver and a control unit connected to the transceiver by a multi-conductor card for remote control of the transceiver comprising: (a) a control unit housing sized to be conveniently held in one hand, (b) a transmit/receive switch, a gain control, and a squelch control, each mounted within the control unit housing and operable therefrom, each being electrically connected to the transceiver through the multi-conductor cord, (c) an electroacoustic transducer, mounted within the control unit housing and electrically connected to the transceiver through the multi-conductor cord, (d) a frequency selecting means mounted within the control unit housing for selecting any one of a number of preset operating frequencies, the frequency selecting means comprising: (1) a programmable random access memory (RAM) for storing codes indicative of each of the preset operating frequencies, (2) a read only memory (ROM) having a first output connected to the RAM for controlling access to the stored codes, (3) a switching circuit connected to the RAM and the ROM for switching the selected stored code to a phase-loop locked (PLL) driving circuit connected to the transceiver through said multi-conductor cord, (4) a binary up/down counter connected to an input of the ROM for indexing the ROM through the operating frequencies, (5) an up/down circuit, connected to one input of the binary up/down counter and operated by manually actuated up/down switches for manually selecting the desired preselected operating frequency, and (6) a vacant channel selecting circuit and clock oscillator connected to another input of the binary up/down counter for automatically scanning and selecting a vacant operating frequency on which the transceiver might operate, (e) a channel number display means situated with its display surfaces exposed out of said control unit housing and connected to the switching circuit of the frequency selecting means for displaying the channel number of the selected operating frequency, (f) a transceiver housing, (g) a PLL frequency synthesizer in the transceiver housing and connected to the PLL driving circuit of said frequency selecting means for synthesizing a local oscillation controlling the transmitting and receiving frequencies, (h) a receiving circuit in the transceiver housing connected through the multi-conductor cord to the transmit/receive switch, gain control and squelch control, the receiving circuit comprising: (1) a radio frequency amplifier (R.F.Amp.) for amplifying any input radio wave signal from an antenna, (2) a mixer connected to the R.F.Amp. and the PLL frequency synthesizer for converting the output from the R.F.Amp. into an intermediate frequency (I.F.) signal in accordance with the local oscillation output from the PLL frequency synthesizer, (3) an IF amplifier connected to the mixer for amplifying the IF signal output from the mixer, (4) a detector connected to the I.F. amplifier for detecting any audio frequency output from the IF amplifier, and (5) a modulator serving as an audio amplifier, connected to the detector and through the multi-conductor cord to the electroacoustic transducer, for amplifying the audio frequency output from the detector, the amplified audio frequency signal being applied to the electroacoustic transducer, the receiving circuit becoming operative by the operation of the transmit/receive switch, and (i) a transmitting circuit in the transceiver housing connected through the multi-conductor cord to the transmit/receive switch, the transmitting circuit comprising: (1) said modulator generating an output at the frequency selected by the frequency selecting means modified by an audio signal component from said electroacoustic transducer, and (2) a transmitting part for amplifying and transmitting from an antenna the output from the transmitting circuit, the transmitting circuit becoming operative by the operation of the transmit/receive switch.

Claim 18

A transceiver and a control unit connected to the transceiver by a multi-conductor card for remote control of the transceiver comprising: (a) a control unit housing sized to be conveniently held in one hand, (b) a transmit/receive switch, a gain control, and a squelch control, each mounted within the control unit housing and operable therefrom, each being electrically connected to the transceiver through the multi-conductor cord, (c) an electroacoustic transducer, mounted within the control unit housing and electrically connected to the transceiver through the multi-conductor cord, (d) a frequency selecting means mounted within the control unit housing for selecting any one of a number of preset operating frequencies, the frequency selecting means comprising: (1) a programmable random access memory (RAM) for storing codes indicative of each of the preset operating frequencies, (2) a read only memory (ROM) having a first output connected to the RAM for controlling access to the stored codes, (3) a switching circuit connected to the RAM and the ROM for switching the selected stored code to a phase-loop locked (PLL) driving circuit connected to the transceiver through said multi-conductor cord, (4) a binary up/down counter connected to an input of the ROM for indexing the ROM through the operating frequencies, (5) an up/down circuit, connected to one input of the binary up/down counter and operated by manually actuated up/down switches for manually selecting the desired preselected operating frequency, and (6) a vacant channel selecting circuit and clock oscillator connected to another input of the binary up/down counter for automatically scanning and selecting a vacant operating frequency on which the transceiver might operate, (e) a channel number display means situated with its display surfaces exposed out of said control unit housing and connected to the switching circuit of the frequency selecting means for displaying the channel number of the selected operating frequency, (f) a transceiver housing, (g) a PLL frequency synthesizer in the transceiver housing and connected to the PLL driving circuit of said frequency selecting means for synthesizing a local oscillation controlling the transmitting and receiving frequencies, (h) a receiving circuit in the transceiver housing connected through the multi-conductor cord to the transmit/receive switch, gain control and squelch control, the receiving circuit comprising: (1) a radio frequency amplifier (R.F.Amp.) for amplifying any input radio wave signal from an antenna, (2) a mixer connected to the R.F.Amp. and the PLL frequency synthesizer for converting the output from the R.F.Amp. into an intermediate frequency (I.F.) signal in accordance with the local oscillation output from the PLL frequency synthesizer, (3) an IF amplifier connected to the mixer for amplifying the IF signal output from the mixer, (4) a detector connected to the I.F. amplifier for detecting any audio frequency output from the IF amplifier, and (5) a modulator serving as an audio amplifier, connected to the detector and through the multi-conductor cord to the electroacoustic transducer, for amplifying the audio frequency output from the detector, the amplified audio frequency signal being applied to the electroacoustic transducer, the receiving circuit becoming operative by the operation of the transmit/receive switch, and (i) a transmitting circuit in the transceiver housing connected through the multi-conductor cord to the transmit/receive switch, the transmitting circuit comprising: (1) said modulator generating an output at the frequency selected by the frequency selecting means modified by an audio signal component from said electroacoustic transducer, and (2) a transmitting part for amplifying and transmitting from an antenna the output from the transmitting circuit, the transmitting circuit becoming operative by the operation of the transmit/receive switch.