Crystalless scanning radio receiver controlled by processing means

Claim 2

A receiver for monitoring a plurality of predetermined radio frequency channels located in one or more RF bands, and for selecting one channel having a radio frequency signal thereon, said receiver comprising: a RF section for the RF band and including a RF amplifier and a RF mixer, said RF section providing an intermediate signal when a radio frequency signal is received on a channel; an IF section operably connected to said RF band mixer and including an IF amplifier for amplifying the intermediate signal received from said RF section; detector means for producing an audio signal when said intermediate signal is being received; an audio amplifier connected to said detector means for driving an audio speaker with said audio signal; means for disabling the audio amplifier when no audio signal is being received and for producing an indicating signal for application to a processing means when an audio signal is being received; frequency synthesizing means for selectively generating beating signals of predetermined frequencies for application to said RF mixer to select a frequency and provide said intermediate signal, said frequency synthesizing means including a phase-locked-loop and being operable to provide said beating signals of preselected frequencies in response to various preselected input signals being applied thereto; memory means for storing operating instructions for use by a processing means and for storing information for a plurality of channels; processing means for controlling said frequency synthesizing means and for loading and retrieving information and instructions from said memory means, said processing means being adapted to retrieve said various preselected input signals concerning said channels from said memory means and apply to same to said frequency synthesizing means; keyboard means comprising a plurality of keys operably connected to said processing means for entering and loading instructions and frequency information for controlling the operation of said processing means, said keyboard including a plurality of function and numerical keys for entering decimal frequency information and for controlling the operation of said receiver.

Claim 3

A receiver as defined in claim 1 wherein said processing means normally operates in a first mode wherein said various preselected input signals concerning said channels are retrieved from said memory means and are applied to said frequency synthesizing means whereby said channels are sequentially scanned, said scanning terminating on a specific channel in response to receiving said indicating signal, said processing means resuming the scanning of said channels in response to the termination of said indicating signal.

Claim 4

A receiver as defined in claim 1 including display means that provides a visual readout of selected channel, frequency and status information concerning the operation of said receiver.

Claim 5

A receiver as defined in claim 2 wherein the radio frequency channels are located in two or more RF bands and further including band switching means for energizing said RF section when the channel being scanned is within said RF band.

Claim 6

A receiver as defined in claim 2 wherein said processing means is transferred into a second mode of operation in response to selective operation of said keyboard means, said processing means successively incrementing through said channels in response to successive selective actuation of said keyboard means.

Claim 7

A receiver as defined in claim 5 wherein said keyboard means is inoperative when said processing means is in said first mode, except for said key that affects transfer of said processing means from said first to said second mode of operation.

Claim 8

A receiver as defined in claim 6 wherein substantially all of said keys of said keyboard means are operative when said processing means is in said second mode of operation.

Claim 9

A receiver as defined in claim 1 wherein said memory means stores digital information for each of said channels, including information indicating the existence of a frequency loaded therein, the lock out status, RF band identification and the frequency thereof.

Claim 10

A receiver as defined in claim 4 wherein said processing means is transferred from said second mode of operation to a third mode of operation in response to actuation of one of said numerical keys, said third mode of operation permitting a frequency to be entered into said display means in response to selective actuation of said numerical keys.

Claim 11

A receiver as defined in claim 9 wherein said displayed frequency is loaded into one of said channel locations of said memory means in response to actuation of a designated function key.

Claim 12

A receiver as defined in claim 10 wherein said processing means is adapted to generate an error signal in the event the frequency that is displayed is outside of the bandwidth of said band in response to actuation of said designated function key.

Claim 13

A receiver as defined in claim 9 wherein said processing means is transferred to a fourth mode of operation from said third mode of operation in response to actuation of a second designated function key which causes said frequency synthesizing means to generate said initial displayed frequency and to thereafter sequentially generate a predetermined number of successive incremental frequencies and to terminate said sequential generation in the event that said indicating signal is received.

Claim 14

A receiver as defined in claim 12 wherein information concerning the frequency of a radio frequency that is received while said processing means is operating in said fourth mode is loaded into one of said channel location of said memory means in response to actuation of a preselected function key.

Claim 15

A signal seeking receiver for automatically scanning and monitoring a plurality of predetermined radio frequency channels located in one or more RF bands, and for selecting one channel having a radio frequency signal thereon, said receiver comprising: a RF section for the RF band and including a RF amplifier and a RF mixer, said RF section providing an intermediate signal when a radio frequency signal is received on a channel; an IF section operably connected to said RF band mixer and including an IF amplifier for amplifying the intermediate signal received from said RF section; detector means for producing an audio signal when said intermediate signal is being received; an audio amplifier connected to said detector means for driving an audio speaker with said audio signal; means for disabling the audio amplifier when no audio signal is being received and for producing an indicating signal for application to a processing means when an audio signal is being received; frequency synthesizing means for selectively generating beating signals of predetermined frequencies for application to said RF mixer to select a frequency and provide said intermediate signal, said frequency synthesizing means including a phase-locked-loop and being operable to provide said beating signals of preselected frequencies in response to various preselected input signals being applied thereto; memory means for storing operating instructions for use by a processing means and for storing information for a plurality of channels; processing means for controlling said frequency synthesizing means and for loading and retrieving information and instructions from said memory means, said processing means normally operating in a first mode wherein said various preselected input signals concerning said channels are retrieved from said memory means and are applied to said frequency synthesizing means whereby said channels are sequentially scanned, said scanning terminating on a specific channel in response to receiving said indicating signal, said processing means resuming the scanning of said channels in response to the termination of said indicating signal; keyboard means comprising the plurality of numerical and function keys operably connected to said processing means for entering and loading instructions and decimal frequency information and for controlling the operation thereof; display means operably connected to said processing means for selectively providing a visual readout of selected information concerning the operation of said receiver; said processing means being transferred into a second mode of operation in response to selective operation of said keyboard means.

Claim 16

A signal seeking receiver for automatically scanning and monitoring a plurality of predetermined radio frequency channels located in one or more RF bands, and for selecting one channel having a radio frequency signal thereon, said receiver comprising: a RF section for the RF band and including a RF amplifier and a RF mixer, said RF section providing an intermediate signal when a radio frequency signal is received on a channel; an IF section operably connected to said RF band mixer and including an IF amplifier for amplifying the intermediate signal received from said RF section; detector means for producing an audio signal when said intermediate signal is being received; an audio amplifier connected to said detector means for driving an audio speaker with said audio signal; means for disabling the audio amplifier when no audio signal is being received and for producing an indicating signal for application to a processing means when an audio signal is being received; frequency synthesizing means for selectively generating beating signals of predetermined frequencies for application to said RF mixer to select a frequency and provide said intermediate signal, said frequency synthesizing means including a phase-locked-loop and being operable to provide said beating signals of preselected frequencies in response to various preselected input signals being applied thereto; memory means for storing operating instructions for use by a processing means and for storing information for a plurality of channels; processing means for controlling said frequency synthesizing means and for loading and retrieving information and instructions from said memory means, said processing means normally operating in a first mode wherein said various preselected input signals concerning said channels are retrieved from said memory means and are applied to said frequency synthesizing means whereby said channels are sequentially scanned, said scanning terminating on a specific channel in response to receiving said indicating signal, said processing means resuming the scanning of said channels in response to the termination of said indicating signal; keyboard means comprising the plurality of numerical and function keys operably connected to said processing means for entering and loading instructions and decimal frequency information and for controlling the operation thereof; display means operably connected to said processing means for selectively providing a visual readout of selected information concerning the operation of said receiver; said processing means being transferred into a second mode of operation in response to selective operation of said keyboard means.

Claim 17

A receiver as defined in claim 14 wherein said keyboard means is inoperative when said processing means is in said first mode, except for said key that affects transfer of said processing means from said first to said second mode of operation.

Claim 18

A receiver as defined in claim 15 wherein substantially all of said keys of said keyboard means are operative when said processing means is in said second mode of operation.

Claim 19

A receiver as defined in claim 16 wherein said display means provides a visual readout of the channel number during the sequential scanning, said display means alternatingly providing the channel number and signal frequency when a radio frequency signal is received on one of said selected channels.

Claim 20

A receiver as defined in claim 14 wherein said processing means is transferred to a third mode of operation in response to actuation of one of said numerical keys, said third mode of operation permitting a frequency to be entered into said display means in response to selective actuation of said numerical keys.

Claim 21

A receiver as defined in claim 18 wherein said processing means is transferred to a fourth mode of operation from said third mode of operation in response to actuation of a second designated function key which causes said frequency synthesizing means to generate said initial displayed frequency and to thereafter sequentially generate a predetermined number of successive incremental frequencies and to terminate said sequential generation in the event that said indicating signal is received.

Claim 22

A receiver as defined in claim 19 wherein information concerning the frequency of a radio frequency signal that is received while said processing means is operating in said fourth mode is loaded into one of said channel location of said memory means in response to actuation of a preselected function key.

Claim 23

A signal seeking receiver for automatically scanning and monitoring a plurality of predetermined radio frequency channels located in one or more RF bands, and for selecting one channel having a radio frequency signal thereon, said receiver comprising: a RF section for the RF band and including a RF amplifier and a RF mixer, said RF section providing an intermediate signal when a radio frequency signal is received on a channel; an IF section operably connected to said RF band mixer and including an IF amplifier for amplifying the intermediate signal received from said RF section; detector means for producing an audio signal when said intermediate signal is being received; an audio amplifier connected to said detector means for driving an audio speaker with said audio signal; means for disabling the audio amplifier when no audio signal is being received and for producing an indicating signal for application to a processing means when an audio signal is being received; frequency synthesizing means for selectively generating beating signals of predetermined frequencies for application of said RF mixer to select a frequency and provide said intermediate signal, said frequency synthesizing means including a phase-locked-loop and being operable to provide said beating signals of preselected frequencies in response to various preselected input signals being applied thereto; memory means for storing operating instructions for use by a processing means and for storing information for a plurality of channels; processing means for controlling said frequency synthesizing means and for loading and retrieving information and instructions from said memory means, said processing means being adapted to retrieve said various preselected input signals concerning said channels from said memory means and apply the same to said frequency synthesizing means; keyboard means comprising the plurality of numerical and function keys operably connected to said processing means for entering and loading instructions and decimal frequency information and for controlling the operation thereof; display means operably connected to said processing means for selectively providing a visual readout of selected information concerning the operation of said receiver; actuation of a selected key of said keyboard enabling said processing means to permit a frequency to be entered into said display means in response to selective actuation of said numerical keys.

Claim 24

A signal seeking receiver for automatically scanning and monitoring a plurality of predetermined radio frequency channels located in one or more RF bands, and for selecting one channel having a radio frequency signal thereon, said receiver comprising: a RF section for the RF band and including a RF amplifier and a RF mixer, said RF section providing an intermediate signal when a radio frequency signal is received on a channel; an IF section operably connected to said RF band mixer and including an IF amplifier for amplifying the intermediate signal received from said RF section; detector means for producing an audio signal when said intermediate signal is being received; an audio amplifier connected to said detector means for driving an audio speaker with said audio signal; means for disabling the audio amplifier when no audio signal is being received and for producing an indicating signal for application to a processing means when an audio signal is being received; frequency synthesizing means for selectively generating beating signals of predetermined frequencies for application of said RF mixer to select a frequency and provide said intermediate signal, said frequency synthesizing means including a phase-locked-loop and being operable to provide said beating signals of preselected frequencies in response to various preselected input signals being applied thereto; memory means for storing operating instructions for use by a processing means and for storing information for a plurality of channels; processing means for controlling said frequency synthesizing means and for loading and retrieving information and instructions from said memory means, said processing means being adapted to retrieve said various preselected input signals concerning said channels from said memory means and apply the same to said frequency synthesizing means; keyboard means comprising the plurality of numerical and function keys operably connected to said processing means for entering and loading instructions and decimal frequency information and for controlling the operation thereof; display means operably connected to said processing means for selectively providing a visual readout of selected information concerning the operation of said receiver; actuation of a selected key of said keyboard enabling said processing means to permit a frequency to be entered into said display means in response to selective actuation of said numerical keys.

Claim 25

A receiver as defined in claim 21 wherein said displayed frequency on said display means is loaded into said memory means in response to actuation of a designated function key of said keyboard.

Claim 26

A receiver as defined in claim 22 wherein said processing means is adapted to generate an error signal in the event the frequency that is displayed is outside of a predetermined bandwidth in response to actuation of said designated function key.

Claim 27

A receiver as defined in claim 21 wherein said processing means is adapted to enable said frequency synthesizing means to generate the frequency displayed on said display means and to thereafter sequentially generate a predetermined number of successive incremental frequencies and to terminate said sequential generation in the event that said indicating signal is received in response to selective actuation of said keyboard.

Claim 28

A receiver as defined in claim 24 wherein selective actuation of said keyboard comprises actuation of a second designation function key.

Claim 29

A receiver as defined in claim 24 wherein the frequency associated with said radio frequency signal which results in the termination of said sequential generation due to receiving said indicating signal is loaded into one of said channel locations of said memory means in response to actuation of a preselected function key.

Claim 30

A receiver for receiving a plurality of predetermined radio frequency channels located in one or more RF bands, said receiver comprising: a RF section for the RF band and including a RF amplifier and a RF mixer, said RF section providing an intermediate signal when a radio frequency signal is received on a channel; an IF section operably connected to said RF band mixer and including an IF amplifier for amplifying the intermediate signal received from said RF section; detector means for producing an audio signal when said intermediate signal is being received; an audio amplifier connected to said detector means for driving an audio speaker with said audio signal; means for disabling the audio amplifier when no audio signal is being received and for producing an indicating signal for application to a processing means when an audio signal is being received; a voltage controlled oscillator for generating beating signals of predetermined frequencies for application to said RF mixer to select a frequency and provide said intermediate signal, said voltage controlled oscillator producing output frequencies which vary in proportion to the voltage level applied to the input thereof; digital-to-analog conversion means having its output connected to the input of said voltage controlled oscillator, said conversion means being adapted to vary the voltage applied to said oscillator in accordance with the digital information applied thereto from a processing means; memory means for storing operating instructions for use by a processing means and for storing information for a plurality of channels; processing means for generating digital information and applying the same to said conversion means for controlling said voltage controlled oscillator and for loading and retrieving information and instructions from said memory means, said processing means being adapted to retrieve various digital information signals concerning said channels from said memory means and apply the same to said conversion means whereby said voltage controlled oscillator is controlled to generate the beating signals for selecting the frequencies to monitor said channels; and, keyboard means comprising a plurality of keys operably connected to said processing means for entering and loading instructions and frequency information for controlling the information of said processing means, said keyboard including a plurality of function and numerical keys for entering decimal frequency information and for controlling the operation of said receiver.

Claim 31

A receiver for receiving a plurality of predetermined radio frequency channels located in one or more RF bands, said receiver comprising: a RF section for the RF band and including a RF amplifier and a RF mixer, said RF section providing an intermediate signal when a radio frequency signal is received on a channel; an IF section operably connected to said RF band mixer and including an IF amplifier for amplifying the intermediate signal received from said RF section; detector means for producing an audio signal when said intermediate signal is being received; an audio amplifier connected to said detector means for driving an audio speaker with said audio signal; means for disabling the audio amplifier when no audio signal is being received and for producing an indicating signal for application to a processing means when an audio signal is being received; a voltage controlled oscillator for generating beating signals of predetermined frequencies for application to said RF mixer to select a frequency and provide said intermediate signal, said voltage controlled oscillator producing output frequencies which vary in proportion to the voltage level applied to the input thereof; digital-to-analog conversion means having its output connected to the input of said voltage controlled oscillator, said conversion means being adapted to vary the voltage applied to said oscillator in accordance with the digital information applied thereto from a processing means; memory means for storing operating instructions for use by a processing means and for storing information for a plurality of channels; processing means for generating digital information and applying the same to said conversion means for controlling said voltage controlled oscillator and for loading and retrieving information and instructions from said memory means, said processing means being adapted to retrieve various digital information signals concerning said channels from said memory means and apply the same to said conversion means whereby said voltage controlled oscillator is controlled to generate the beating signals for selecting the frequencies to monitor said channels; and, keyboard means comprising a plurality of keys operably connected to said processing means for entering and loading instructions and frequency information for controlling the information of said processing means, said keyboard including a plurality of function and numerical keys for entering decimal frequency information and for controlling the operation of said receiver.

Claim 32

A receiver as defined in claim 27 wherein said processing means applies digital information to said conversion means whereby said channels are sequentially scanned, said scanning terminated on a specific channel in response to receiving said indicating signal, said processing means resuming the scanning of said channels in response to the termination of said indicating signal.

Claim 33

Apparatus for transmitting and for receiving a plurality of predetermined radio frequency channels located in one or more RF bands, said apparatus comprising: a RF receiving section for the RF band including a RF amplifier and a RF mixer, said RF receiving section providing an intermediate signal when a radio frequency signal is being received on a channel; a RF transmitting section for one or more RF bands and including means for modulating a RF signal with an information signal, means for amplifying said modulated RF signal for transmission; an IF section operably connected to said RF band mixer and including an IF amplifier for amplifying the intermediate signal received from said RF receiving section; detector means for producing an audio signal when said intermediate signal is being received; an audio amplifier connected to said detector means for driving an audio speaker with said audio signal; means for disabling the audio amplifier when no audio signal is being received and for producing an indicating signal for application to a processing means when an audio signal is being received; frequency synthesizing means for selectively generating selecting signals of predetermined frequencies for application to said RF receiving section and said RF transmitting section for selecting a frequency for transmitting by said transmitting section or for receiving by said receiving section, said selecting signals being applied to said RF mixer of said RF receiving section to select a frequency and provide said intermediate signal, said frequency synthesizing means including a phase-locked-loop and being operable to provide said selecting signals of preselected frequencies in response to various preselected input signals being applied thereto; memory means for storing operating instructions for use by a processing means and for storing information for a plurality of channels; processing means for controlling said frequency synthesizing means and for loading and retrieving information and instructions from said memory means, said processing means being adapted to operate in a first mode wherein said various preselected input signals concerning said channels are retrieved from said memory means and are applied to said frequency synthesizing means so that said apparatus can either transmit or receive on one of said channels; and, keyboard means comprising a plurality of keys operably connected to said processing means for entering and loading instructions and frequency information for controlling the operation of said processing means, said keyboard including a plurality of function and numerical keys for entering decimal frequency information and for controlling said apparatus in its transmitting and receiving operations.

Claim 34

Apparatus for transmitting and for receiving a plurality of predetermined radio frequency channels located in one or more RF bands, said apparatus comprising: a RF receiving section for the RF band including a RF amplifier and a RF mixer, said RF receiving section providing an intermediate signal when a radio frequency signal is being received on a channel; a RF transmitting section for one or more RF bands and including means for modulating a RF signal with an information signal, means for amplifying said modulated RF signal for transmission; an IF section operably connected to said RF band mixer and including an IF amplifier for amplifying the intermediate signal received from said RF receiving section; detector means for producing an audio signal when said intermediate signal is being received; an audio amplifier connected to said detector means for driving an audio speaker with said audio signal; means for disabling the audio amplifier when no audio signal is being received and for producing an indicating signal for application to a processing means when an audio signal is being received; frequency synthesizing means for selectively generating selecting signals of predetermined frequencies for application to said RF receiving section and said RF transmitting section for selecting a frequency for transmitting by said transmitting section or for receiving by said receiving section, said selecting signals being applied to said RF mixer of said RF receiving section to select a frequency and provide said intermediate signal, said frequency synthesizing means including a phase-locked-loop and being operable to provide said selecting signals of preselected frequencies in response to various preselected input signals being applied thereto; memory means for storing operating instructions for use by a processing means and for storing information for a plurality of channels; processing means for controlling said frequency synthesizing means and for loading and retrieving information and instructions from said memory means, said processing means being adapted to operate in a first mode wherein said various preselected input signals concerning said channels are retrieved from said memory means and are applied to said frequency synthesizing means so that said apparatus can either transmit or receive on one of said channels; and, keyboard means comprising a plurality of keys operably connected to said processing means for entering and loading instructions and frequency information for controlling the operation of said processing means, said keyboard including a plurality of function and numerical keys for entering decimal frequency information and for controlling said apparatus in its transmitting and receiving operations.

Claim 35

Apparatus as defined in claim 29 wherein said transmitting section further includes means for generating a signal to which said selecting signals can be mixed for producing said RF signal to which said information signal is modulated, and mixing means adapted to mix said selecting signals from said frequency synthesizing means with said signal from said signal generating means, the output from said mixing means being located substantially at the frequency of said modulated RF signal that is transmitted.

Claim 36

Apparatus as defined in claim 30 wherein the output of said mixing means is applied to said RF signal modulating means.

Claim 37

Apparatus as defined in claim 31 wherein said transmitting section further includes antenna means for transmitting said modulated RF signal.

Claim 38

Apparatus for transmitting and for receiving a plurality of predetermined radio frequency channels located in one or more RF bands, said apparatus comprising: a RF receiving section for the RF band, including a RF amplifier and a RF mixer, said RF receiving section providing an intermediate signal when a radio frequency signal is received on a channel; a RF transmitting section for one or more RF bands and including means for modulating a RF signal with an information signal, means for amplifying said modulated signal for transmission; an IF section operably connected to said RF band mixer and including an IF amplifier for amplifying the intermediate signal received from said RF receiving section; detector means for producing an audio signal when said intermediate signal is being received; an audio amplifier connected to said detector means for driving an audio speaker with said audio signal; means for disabling the audio amplifier when no audio signal is being received and for producing an indicating signal for application to a processing means when an audio signal is being received; frequency generating means for selectively generating selecting signals of predetermined frequencies for application to said RF receiving section and said RF transmitting section, for selecting a frequency for transmitting by said transmitting section or for receiving by said receiving section, said selecting signals being applied to said RF mixer of said RF receiving section to select a frequency and provide said intermediate signal, said frequency generating means including a voltage controlled oscillator being adapted to provide said selecting signals of preselected frequencies in response to a preselected voltage level being applied thereto, said oscillator output signal frequency varying in proportion to the voltage level applied at the input of said oscillator; memory means for storing operating instructions for use by a processing means and for storing information for a plurality of channels; means for converting a digital word signal to a voltage level, said converting means having its output connected to the input of said voltage controlled oscillator so that the voltage level applied thereto varies in accordance with the digital information applied to said converting means; processing means for controlling said frequency generating means and for loading and retrieving information and instructions from said memory means, said processing means being adapted to retrieve information concerning said channels from said memory means and provide digital information to said converting means so that said converting means applies the proper voltage to said voltage controlled oscillator so that said apparatus can either transmit or receive on one of said channels, said processing means being operably connected to the output of said oscillator to monitor the frequency being generated and to adjust the digital information applied to said converting means if the oscillator output frequency deviates from the desired predetermined frequency; and keyboard means comprising a plurality of keys operably connected to said processing means for entering and loading instructions and frequency information for controlling the operation of said processing means, said keyboard including a plurality of function and numerical keys for entering decimal frequency information and for controlling said apparatus in its transmitting and receiving operations.

Claim 39

Apparatus for transmitting and for receiving a plurality of predetermined radio frequency channels located in one or more RF bands, said apparatus comprising: a RF receiving section for the RF band, including a RF amplifier and a RF mixer, said RF receiving section providing an intermediate signal when a radio frequency signal is received on a channel; a RF transmitting section for one or more RF bands and including means for modulating a RF signal with an information signal, means for amplifying said modulated signal for transmission; an IF section operably connected to said RF band mixer and including an IF amplifier for amplifying the intermediate signal received from said RF receiving section; detector means for producing an audio signal when said intermediate signal is being received; an audio amplifier connected to said detector means for driving an audio speaker with said audio signal; means for disabling the audio amplifier when no audio signal is being received and for producing an indicating signal for application to a processing means when an audio signal is being received; frequency generating means for selectively generating selecting signals of predetermined frequencies for application to said RF receiving section and said RF transmitting section, for selecting a frequency for transmitting by said transmitting section or for receiving by said receiving section, said selecting signals being applied to said RF mixer of said RF receiving section to select a frequency and provide said intermediate signal, said frequency generating means including a voltage controlled oscillator being adapted to provide said selecting signals of preselected frequencies in response to a preselected voltage level being applied thereto, said oscillator output signal frequency varying in proportion to the voltage level applied at the input of said oscillator; memory means for storing operating instructions for use by a processing means and for storing information for a plurality of channels; means for converting a digital word signal to a voltage level, said converting means having its output connected to the input of said voltage controlled oscillator so that the voltage level applied thereto varies in accordance with the digital information applied to said converting means; processing means for controlling said frequency generating means and for loading and retrieving information and instructions from said memory means, said processing means being adapted to retrieve information concerning said channels from said memory means and provide digital information to said converting means so that said converting means applies the proper voltage to said voltage controlled oscillator so that said apparatus can either transmit or receive on one of said channels, said processing means being operably connected to the output of said oscillator to monitor the frequency being generated and to adjust the digital information applied to said converting means if the oscillator output frequency deviates from the desired predetermined frequency; and keyboard means comprising a plurality of keys operably connected to said processing means for entering and loading instructions and frequency information for controlling the operation of said processing means, said keyboard including a plurality of function and numerical keys for entering decimal frequency information and for controlling said apparatus in its transmitting and receiving operations.