JP6107408B2 - Wireless communication device and reception frequency adjustment method - Google Patents

Description

  The present invention relates to a radio receiver that receives and transmits a radio signal, and more particularly to a radio communication apparatus and a reception frequency adjustment method that can adjust a reception frequency of a radio signal.

  Conventionally, in a radio communication device such as a transceiver capable of transmitting and receiving, one voltage control type reference signal generator is provided in one radio communication device, and the reference signal generated by the reference signal generator is used as a basis. In addition, a local oscillator that configures a VCO (Voltage Controlled Oscillator) circuit or the like by PLL (Phase Locked Loop) control, and a radio frequency is configured based on a reference signal. Further, in order to check whether the transmission frequency is a specified frequency, the output terminal of the local oscillator is pulled out from the housing at the time of transmission, and the frequency of the signal generated by the local oscillator is measured. When the measured frequency deviates from the specified frequency, the transmission frequency of the wireless communication device can be corrected by adjusting the control voltage applied to the frequency control terminal of the reference signal generator. As a result, the reception frequency for reception generated based on the same reference signal generator is also corrected simultaneously (see, for example, Patent Document 1).

Japanese Patent No. 3034319

  However, in a wireless communication device that transmits or receives a target signal using the FSK (Frequency Shift Keying) method, the frequency of the signal generated from the local oscillator is measured when the transmission operation is performed, and the transmission frequency is corrected as described above. Even so, the reception frequency may deviate from the specified frequency.

  As an FSK modulation transmission / reception circuit, there is a circuit that directly connects an output terminal of a modem that outputs an FSK modulation signal during normal transmission to a frequency control terminal of a reference signal generator that generates a reference signal. This modem outputs "H" level and "L" level voltages across a neutral voltage corresponding to a 1/0 digital signal during transmission, and outputs a neutral voltage during reception. In such a transmission / reception circuit, even if the same control voltage is applied to the frequency control terminal of the reference signal generator at the time of transmission and reception, the output voltage from the modem is separately added to the frequency control terminal. When a deviation occurs between the neutral voltage of the modem and the neutral voltage of the modem at the time of reception, a deviation also occurs in the frequency of the generated reference signal. Therefore, even if the output voltage output to the frequency control terminal of the reference signal generator at the time of transmission is adjusted and the transmission frequency is corrected to a specified frequency, the reception frequency is not simultaneously corrected to the specified frequency.

  The present invention solves the above-described problems, and in a FSK wireless communication device, a wireless communication device capable of correcting a reception frequency to a specified frequency without opening a housing of the wireless communication device, and a reception device. An object is to provide a frequency adjustment method.

  In order to solve the above-described problems, the present invention provides a reference signal generator that generates a reference signal based on a control signal input to a control terminal, and a local oscillator that generates a frequency conversion signal by frequency-converting the reference signal. A reception circuit that receives a radio signal based on the frequency conversion signal, a transmission circuit that generates a transmission signal based on the frequency conversion signal and outputs the transmission signal to an antenna terminal, and is connected to the control terminal and receives input data during transmission And a modem that outputs a modulation signal and outputs a neutral signal upon reception, a control circuit for outputting a control signal to the control terminal, and a reference that is referred to by the control circuit, A memory for storing a transmission adjustment value and a reception adjustment value for switching and outputting the control signal output by the control circuit between transmission and reception. And an operation unit for performing various operations including an operation for changing the reception frequency, and when the operation for measuring the reception frequency is performed from the operation unit, the control circuit receives a neutral signal from the modem. And generating a control signal to be supplied to the control terminal based on the neutral signal and the reception adjustment value stored in the memory, and the reference signal generator generates a reference signal corresponding to the generated reference signal. In response to this output, the transmission circuit outputs a transmission signal for reception frequency measurement to the antenna terminal.

  In addition, when an adjustment value for correcting a reception frequency is input to the operation unit, it is preferable that the reception adjustment value stored in the memory is corrected.

  The reference signal generator is preferably a voltage control type signal generator.

  In addition, the wireless communication device is preferably an FSK modulation method.

  The present invention also provides a reference signal generator that generates a reference signal based on a control signal input to a control terminal, a local oscillator that generates a frequency conversion signal by frequency converting the reference signal, and the frequency conversion signal. A reception circuit that receives a radio signal based on the frequency, a transmission circuit that generates a transmission signal based on the frequency conversion signal and outputs the transmission signal to an antenna terminal, and is connected to the control terminal and modulates and modulates input data during transmission A wireless communication device comprising: a modem that outputs a signal and outputs a neutral signal when received; a control circuit for outputting a control signal to the control terminal; and the control circuit that is referred to by the control circuit and outputs the control signal A memory for storing a transmission adjustment value and a reception adjustment value for switching and outputting a control signal between transmission and reception, and a reception frequency An operation unit for performing various operations including an operation for changing, and a cutoff switch provided between the modem and the control terminal for connecting or blocking an output signal of the modem. When the operation of measuring the reception frequency is performed from the control unit, the control circuit cuts off the output from the modem by the cut-off switch, and gives to the control terminal based on the adjustment value for reception stored in the memory The reference signal generator outputs a reference signal corresponding to the generated reference signal, and in response to the output, the transmission circuit outputs a transmission signal for reception frequency measurement to the antenna terminal. .

  Further, the present invention provides a reference signal generating step for generating a reference signal based on a control signal input to a control terminal, a frequency converted signal generating step for generating a frequency converted signal by frequency converting the reference signal, A reception step for receiving a radio signal based on the frequency converted signal, a transmission step for generating a transmission signal based on the frequency converted signal and outputting it to the antenna terminal, and modulating the input data during transmission to output a modulated signal An output step of outputting a neutral signal at the time of reception, and a control step for outputting a control signal to the control terminal and an output step of switching the control signal between transmission and reception. Storing the adjustment value for transmission and the adjustment value for reception in the memory, respectively, and an operation for changing the reception frequency A step of performing various operations, and when an operation for measuring a reception frequency is performed from the operation unit, a neutral signal is output from the modem in the output step, and the neutral signal in the control step, A control signal to be supplied to the control terminal is generated based on the reception adjustment value stored in the memory, a reference signal corresponding to the generated reference signal is output in the reference signal generation step, and this is transmitted in the transmission step. A transmission signal for reception frequency measurement is output to the antenna terminal according to the output.

According to the first, fifth, and sixth aspects of the present invention, the reference signal generated by the reference signal generator is generated based on the control signal to which the neutral signal output at the time of reception by the modem is added and transmitted. Since the circuit generates a transmission signal for reception frequency measurement based on the generated reference signal and outputs it to the antenna terminal, the reception frequency of the wireless communication device can be measured without opening the housing of the wireless communication device. .
According to the second aspect of the present invention, the transmission signal for measuring the reception frequency is measured from the antenna or the antenna terminal, and when the frequency is different from the specified frequency, the adjustment value is input so that the deviation is eliminated. Thus, the reception frequency of the wireless communication device can be corrected to a specified frequency.
According to the third aspect of the present invention, the reference signal can be generated by the voltage-controlled reference signal generator.
According to the fourth aspect of the present invention, it is suitable for an FSK modulation type radio communication device.

1 is an electrical block configuration diagram of an FSK wireless communication device according to a first embodiment of the present invention. The flowchart figure which showed the correction operation | movement of the receiving frequency of the radio | wireless communication apparatus. The electrical block block diagram of the FSK system radio | wireless communication apparatus which concerns on a 1st modification. The electrical block block diagram of the FSK system radio | wireless communication apparatus which concerns on a 2nd modification.

(First embodiment)
An FSK wireless communication apparatus according to a first embodiment of the present invention will be described with reference to FIG. In FIG. 1, a wireless communication device 1 includes a control unit 2 constituted by a CPU, a memory 3, an operation unit 4 for receiving various operation information, a D / A conversion circuit 5, an FSK modulation type modem 6, an adder circuit 7, a reference. A signal generator 8 and a PLL synthesizer (local oscillation circuit) 9 are provided. The control unit 2, the D / A conversion circuit 5, and the addition circuit 7 constitute a control circuit 2A referred to in the claims. The phase comparator (PC) 10, loop filter (LPF) 11, and voltage controlled oscillator (VCO) 12 constitute a PLL synthesizer 9. Further, the wireless communication device 1 connects a transmission / reception selector switch 13 for switching a signal output from the PLL synthesizer 9 and an antenna terminal 15 connected to the antenna 16 at the time of reception to the receiving circuit 30 side, and transmits the antenna 16 at the time of transmission. The antenna switch 15 that connects the antenna terminal 15 connected to the transmitter circuit 20 side, and the transmitter circuit 20 that outputs a transmission signal to the antenna 16 are provided. Further, the wireless communication device 1 includes an RF AMP 31 that amplifies a radio signal from the antenna 16, a reception MIX circuit 32 that generates an intermediate frequency signal, an intermediate frequency filter 33, a demodulation circuit 34, a volume 35, an amplifier (AMP) 36, a speaker. (SP) 37 is further provided. The RF AMP 31, the reception MIX circuit 32, the intermediate frequency filter 33, and the demodulation circuit 34 constitute a reception circuit 30.

  The reference signal generator 8 generates a reference signal having a predetermined frequency based on the control signal input to the VC terminal 8a (control terminal). In the memory 3, an adjustment value for transmission at the time of transmission and an adjustment value for reception at the time of reception are stored in advance as adjustment values for adjusting the frequency of the reference signal generated by the reference signal generator 8. At the time of transmission, the control unit 2 reads the transmission adjustment value from the memory 3, and at the time of reception, reads the reception adjustment value, and outputs the read adjustment value, which is a digital signal, to the D / A conversion circuit 5. The D / A conversion circuit 5 converts the adjustment value into a direct current voltage (DC level) and outputs it to the addition circuit 7.

  The modem 6 can switch between two states, a transmission state and a reception state. When the transmission state is set, the modem 6 digitally modulates input data by the FSK modulation method and outputs a modulated signal, or transmission described later. When the frequency is corrected, the output of the modulation signal is stopped and the neutral voltage (signal) is output in order to accurately measure the transmission frequency. When the reception state is set, a neutral voltage (signal) is output.

  The adder circuit 7 adds the DC voltage from the D / A converter circuit 5 and the output voltage from the modem 6 and outputs the result as a control signal to the VC terminal 8 a that is the frequency control terminal of the reference signal generator 8. The reference signal generator 8 generates a reference signal based on the output voltage (control signal) from the adder circuit 7 input to the VC terminal 8 a and outputs the reference signal to the PLL synthesizer 9.

  The PLL synthesizer 9 outputs a desired frequency conversion signal based on the reference signal from the reference signal generator 8 by a frequency divider (not shown) in a feedback portion between the VCO 12 and the PC 10. The transmission / reception change-over switch 13 switches so that the frequency conversion signal from the PLL synthesizer 9 is output to the transmission circuit 20 during transmission and to the reception circuit 30 during reception.

  At the time of transmission, the transmission circuit 20 amplifies the frequency-converted target signal from the PLL synthesizer 9 and outputs it to the antenna changeover switch 14. The antenna changeover switch 14 outputs a target signal from the transmission circuit 20 to the antenna 16 via the antenna terminal 15.

  At the time of reception, a target signal, which is a radio signal, is acquired by the antenna 16 and is amplified by the RF AMP 31 from the antenna terminal 15 via the antenna changeover switch 14. The reception MIX circuit 32 converts the target signal into an intermediate frequency signal by mixing the amplified target signal with the frequency conversion signal from the PLL synthesizer 9. From the target signal converted into the intermediate frequency signal, noise is removed by the intermediate frequency filter 33. The demodulating circuit 34 demodulates the target signal that has been converted to the intermediate frequency and from which noise has been removed. The demodulated target signal is output adjusted by the volume 35, amplified by the AMP 36, and output from the speaker (SP) 37 as an audio signal. Is output.

  Next, the characteristics of the modem 6 and the operation of the wireless communication device 1 when the operation of measuring the reception frequency is performed from the operation unit 4 will be described. As a feature of the FSK modulation type modem 6, the modem 6 converts input data inputted as an analog signal into a digital signal. Further, the modem 6 outputs a modulation signal corresponding to 1/0 of the digital signal with respect to the input data converted into the digital signal. When outputting the modulation signal, if the amplitude of the modulation signal to be output is 1 V, for example, and a sine wave is output, the frequency center value of the sine wave is 0.5 V. Further, when the transmission is stopped and the reception state is set, the neutral voltage output from the modem 6 must be output at 0.5 V corresponding to 0.5 V that is the frequency center value at the time of transmission.

  However, the neutral voltage output from the modem 6 at the time of reception may not be 0.5V due to variations in the performance of the modem 6. In such a case, the control unit 2 causes the reference signal generator 8 to generate a reference signal of the same frequency, so that even if the same voltage is output at the time of transmission and reception, the modem 6 that is added by the adder circuit 7 Since the output voltages of the reference signal generators are different, the frequency of the reference signal generated by the reference signal generator 8 differs between transmission and reception. Therefore, even if the transmission frequency of the wireless communication device 1 is measured at the time of transmission and the transmission frequency of the wireless communication device 1 is corrected to a specified frequency (regular frequency), the reception frequency at the time of reception is the same as the frequency at the time of transmission. Due to the difference, the reception frequency may not be corrected to the specified frequency.

  In the present embodiment, even if there is a variation in the neutral voltage of the modem 6 as described above, the reception frequency can be corrected to a specified frequency separately from the transmission frequency. The configuration and operation will be described below.

The reception frequency correcting operation using the control circuit 2A including the control unit 2 of the wireless communication device 1, the memory 3, the operation unit 4, and the modem 6 is performed as follows.
(1) The operation unit 4 outputs this operation information to the control unit 2 when an operation for measuring the reception frequency is performed.
(2) The control unit 2 sets the modem 6 to the state at the time of reception, and the neutral voltage is output from the modem 6 to the adder circuit 7.
(3) The control unit 2 reads the reception adjustment value from the memory 3 and outputs it to the D / A conversion circuit 5.
(4) The D / A conversion circuit 5 converts the reception adjustment value into an analog voltage and outputs the analog voltage to the adder circuit 7.
(5)
The adder circuit 7 adds the voltage value output from the D / A conversion circuit 5 and the neutral voltage value (neutral signal) of the modem 6 and outputs the result to the reference signal generator 8 as a control signal.
(6)
The control unit 2 switches the transmission / reception selector switch 13 and the antenna selector switch 14 to the transmission circuit 20 side.
(7) The reference signal generator 8 generates a reference signal according to the addition voltage output from the addition circuit 7 input to the VC terminal 8a, and the PLL synthesizer 9 transmits the transmission circuit 20 based on the reference signal. Output to.
(8) The transmission circuit 20 generates a transmission signal for reception frequency measurement from the output signal from the PLL synthesizer 9 and outputs the transmission signal to the antenna 16 via the antenna terminal 15. In this way, when measuring the reception frequency, the modem 6 is forced to output the neutral voltage with the reception state, so the reference signal generated by the reference signal generator 8 is the reference signal at the time of reception. A reference signal having the same frequency is generated.
(9) Whether the reception frequency is a specified frequency is determined by whether the operator connects a frequency counter (frequency measurement device) to the antenna terminal 15 or the antenna 16 and transmits the reception frequency measurement output from the wireless communication device 1. Measure the frequency of the signal. Then, the operator compares the frequency displayed by the measuring instrument with the specified reception frequency, and confirms the frequency deviation.
(10) When the measured frequency deviates from the specified frequency (regular frequency), an adjustment value is input from the operation unit 4 so that the frequency deviation is eliminated.
(11) The control unit 2 corrects the reception adjustment value stored in the memory 3 based on the input adjustment value, and outputs the corrected reception adjustment value to the D / A conversion circuit 5 for transmission. The transmission signal for reception frequency measurement corrected from the circuit 20 is output to the antenna 16.

  In this way, even if the neutral voltage at the time of reception of the modem 6 is not the same as the neutral voltage at the time of transmission, the reception frequency is corrected to the specified frequency separately from the transmission frequency, and the reception frequency at the time of reception is accurately specified. Can be corrected to frequency. Here, the correction of the reception frequency has been described. However, for the correction of the transmission frequency, the adjustment value for transmission is read from the memory 3 and output to the D / A conversion circuit 5, and the modem 6 is set to the state at the time of transmission to obtain the modulation signal. And the neutral voltage is output to the adder circuit 7, and the transmission signal is output from the transmission circuit 20 to the antenna 16 in the same manner as when the reception frequency is adjusted. By measuring the transmission frequency with a frequency counter and inputting an adjustment value from the operation unit 4, the transmission frequency can be corrected to a specified frequency in the same manner as the reception frequency.

  A procedure for correcting the reception frequency of the wireless communication device 1 will be described with reference to FIG. When the operation unit 4 receives an operation for measuring the reception frequency (S1), the operation unit 4 outputs the operation information to the control unit 2. The control unit 2 sets the modem 6 to the reception state (S2), whereby a neutral voltage is output from the modem 6 to the adder circuit 7. The control unit 2 reads the reception adjustment value from the memory 3 (S3) and outputs it to the D / A conversion circuit 5. The D / A conversion circuit 5 converts the reception adjustment value into an analog voltage and outputs the analog voltage to the addition circuit 7. The adder circuit 7 adds the voltage value output from the D / A conversion circuit 5 and the neutral voltage value from the modem 6 and outputs the result to the reference signal generator 8 as a control signal. Further, the transmission / reception selector switch 13 and the antenna selector switch 14 are respectively switched to the transmission circuit 20 side (S4, S5). The reference signal generator 8 generates a reference signal according to the input output (control signal) from the adder circuit 7, generates a transmission frequency based on the reference signal by the PLL synthesizer 9, and sends it to the transmission circuit 20. Output.

  The transmission circuit 20 generates a transmission signal for reception frequency measurement from the output signal from the PLL synthesizer 9 and outputs the transmission signal to the antenna 16. The reception frequency is measured by the operator connecting a frequency counter to the antenna 16 and measuring the frequency of the transmission signal for reception frequency measurement output from the wireless communication device 1 (S6). The measured frequency difference of the transmission signal for reception frequency measurement is compared with the specified reception frequency, and the frequency deviation is confirmed (S7). If the measured frequency deviates from the specified frequency (S8), an adjustment value is input from the operation unit 4 so as to eliminate the frequency deviation (S9). If there is no need for correction, the reception frequency correction operation is terminated. The control unit 2 corrects the reception adjustment value stored in the memory 3 based on the input adjustment value (S10), and outputs the corrected reception adjustment value to the D / A conversion circuit 5 (S11). ), The transmission signal for reception frequency measurement corrected from the transmission circuit 20 is output to the antenna 16.

(First modification)
A first modification of the wireless communication apparatus according to the first embodiment will be described with reference to FIG. In addition, the same part as the wireless communication apparatus 1 of 1st Embodiment attaches | subjects the same code | symbol, and abbreviate | omits the description. In FIG. 3, the difference between the wireless communication device 40 and the wireless communication device 1 shown in FIG. 1 is that a receiving PLL synthesizer 9 and a transmitting PLL synthesizer 41 are provided separately. Even if the transmission and reception PLL synthesizers 9 and 41 are provided in this way, the reference signal is generated by the same reference signal generator 8, so that the modem 6 has the same configuration as described in the first embodiment. When there is a variation in the neutral voltage, the same problem as described in the first embodiment occurs. The transmission PLL synthesizer 41 includes the same PC 42, LPF 43, and VCO 44 as the PLL synthesizer 9 of the wireless communication device 1, and the operation of the transmission PLL synthesizer 41 is the same as that of the PLL synthesizer 9. To do.

  In the wireless communication device 1, the control unit 2 uses the transmission / reception selector switch 13 to switch the frequency conversion signal generated by one PLL synthesizer 9 to the transmission circuit 20 at the time of transmission and to the reception MIX circuit 32 at the time of reception. However, in the wireless communication device 40 of the present embodiment, the PLL synthesizer 9 is used for reception, a transmission PLL synthesizer 41 is newly provided, the reception PLL synthesizer 9 is driven during reception, and the transmission PLL synthesizer is transmitted during transmission. 41 is driven. Therefore, when the operation of measuring the reception frequency is performed, the operation unit 4 can drive the transmission PLL synthesizer 41 and perform the reception frequency correction operation in the same manner as described in the first embodiment. . As described above, even when the reception PLL synthesizer 9 and the transmission PLL synthesizer 41 are separately provided, the reception frequency can be corrected to a prescribed frequency as in the first embodiment.

(Second modification)
A second modification of the wireless communication apparatus according to the first embodiment will be described with reference to FIG. In addition, the same part as the wireless communication apparatus 1 of 1st Embodiment attaches | subjects the same code | symbol, and abbreviate | omits the description. In FIG. 4, the difference between the wireless communication device 50 and the wireless communication device 1 shown in FIG. 1 is that the output voltage of the modem 6 is connected to or disconnected from the addition circuit 7 between the modem 6 and the addition circuit 7. This is the point of providing the cutoff switch 51.

  A method for adjusting the reception frequency of the wireless communication device 50 according to the second modification will be described. When the operation unit 4 receives an operation for measuring the reception frequency, the operation information is output to the control unit 2. The control unit 2 sets the modem 6 to the reception state, and cuts off the connection between the modem 6 and the adder circuit 7 with the cutoff switch 51. Since the subsequent operation of adjusting the reception frequency is the same as the operation after (3) described in the operation of correcting the reception frequency of the wireless communication device 1 of the first embodiment, the description thereof is omitted. When the wireless communication device 50 is set to the normal reception state, the control unit 2 sets the modem 6 to the reception state and corrects the reception frequency from the modem 6 by the cutoff switch 51 as in the case of correcting the reception frequency. It is necessary to cut off the connection between the output and the adder circuit 7. That is, when the reception frequency is measured by the above-described method and the reception frequency is corrected to the specified frequency, the cutoff switch 51 cuts off the output from the modem 6 to the adder circuit 7, and in this state the reception frequency This is because the adjustment value for reception is stored in the memory 3 after correcting the above.

  In the wireless communication device 50 according to the second modification, since the intermediate voltage output when the modem 6 is in the reception state is not output to the adder circuit 7, the variation in the neutral voltage of the modem 6 generates the reference signal during reception. The frequency of the reference signal generated by the device 8 is not affected. Therefore, the reception frequency at the time of reception can be corrected to a specified frequency separately from transmission.

  The present invention is not limited to the configuration of the above-described embodiment, and various modifications are possible. For example, although the control circuit 2A is configured by the control unit 2, the D / A conversion circuit 5, and the addition circuit 7, the whole may be configured by one IC circuit. Further, in order to prevent the general user from correcting the reception frequency, the encryption may be input from the operation unit 4 at the start of the correction operation, and the correction operation may be performed only when the encryption matches.

1, 40, 50 Wireless communication device 2A Control circuit 3 Memory 4 Operation unit 6 Modem 8 Reference signal generator 8a VC terminal (control terminal)
9,41 PLL synthesizer (local oscillator circuit)
15 antenna terminal 16 antenna 20 transmitting circuit 30 receiving circuit 51 cutoff switch

Claims (6)

A reference signal generator that generates a reference signal based on a control signal input to a control terminal, a local oscillator that generates a frequency conversion signal by frequency converting the reference signal, and a radio signal based on the frequency conversion signal A reception circuit for receiving, a transmission circuit for generating a transmission signal based on the frequency conversion signal and outputting the transmission signal to the antenna terminal, connected to the control terminal, modulating the input data at the time of transmission and outputting a modulation signal, and receiving In a wireless communication device comprising a modem that sometimes outputs a neutral signal,
A control circuit for outputting a control signal to the control terminal;
A memory for storing a transmission adjustment value and a reception adjustment value, which are referred to by the control circuit and output by switching the control signal output by the control circuit between transmission and reception;
An operation unit for performing various operations including an operation for changing the reception frequency;
Further comprising
When an operation for measuring the reception frequency is performed from the operation unit,
The control circuit outputs a neutral signal from the modem, generates a control signal to be supplied to the control terminal based on the neutral signal and the reception adjustment value stored in the memory, and the reference signal generator A wireless communication device that outputs a reference signal corresponding to the generated reference signal, and in response to the output, the transmission circuit outputs a transmission signal for reception frequency measurement to the antenna terminal.   The wireless communication device according to claim 1, wherein when the adjustment value for correcting the reception frequency is input to the operation unit, the reception adjustment value stored in the memory is corrected.   The wireless communication device according to claim 1 or 2, wherein the reference signal generator is a voltage control type signal generator. The wireless communication device according to any one of claims 1 to 3, wherein the wireless communication device is an FSK modulation method. A reference signal generator that generates a reference signal based on a control signal input to a control terminal, a local oscillator that generates a frequency conversion signal by frequency converting the reference signal, and a radio signal based on the frequency conversion signal A reception circuit for receiving, a transmission circuit for generating a transmission signal based on the frequency conversion signal and outputting the transmission signal to the antenna terminal, connected to the control terminal, modulating the input data at the time of transmission and outputting a modulation signal, and receiving In a wireless communication device comprising a modem that sometimes outputs a neutral signal,
A control circuit for outputting a control signal to the control terminal;
A memory for storing a transmission adjustment value and a reception adjustment value, which are referred to by the control circuit and output by switching the control signal output by the control circuit between transmission and reception;
An operation unit for performing various operations including an operation for changing the reception frequency;
A cut-off switch provided between the modem and the control terminal for connecting or cutting off an output signal of the modem;
Further comprising
When an operation for measuring the reception frequency is performed from the operation unit,
The control circuit cuts off the output from the modem by the cut-off switch, and generates a control signal to be supplied to the control terminal based on the reception adjustment value stored in the memory, and the reference signal generator generates the control signal. A wireless communication device, wherein a reference signal corresponding to the reference signal thus output is output, and the transmission circuit outputs a transmission signal for reception frequency measurement to the antenna terminal in response to the output. A reference signal generation step for generating a reference signal based on a control signal input to the control terminal, a frequency conversion signal generation step for generating a frequency conversion signal by frequency converting the reference signal, and a frequency conversion signal based on the frequency conversion signal A reception step of receiving a radio signal; a transmission step of generating a transmission signal based on the frequency conversion signal and outputting the transmission signal to the antenna terminal; modulating input data at the time of transmission and outputting a modulated signal; An output step of outputting, a reception frequency adjustment method comprising:
A control step for outputting a control signal to the control terminal;
Storing the adjustment value for transmission and the adjustment value for reception for switching and outputting the control signal between transmission and reception, respectively, in a memory;
Performing various operations including an operation for changing the reception frequency;
Further comprising
When an operation for measuring the reception frequency is performed from the operation unit,
Generating a neutral signal from the modem in the output step; generating a control signal to be supplied to the control terminal based on the neutral signal and the reception adjustment value stored in the memory in the control step; and A reception frequency adjustment method, wherein a reference signal corresponding to the generated reference signal is output in the generation step, and a transmission signal for reception frequency measurement is output to the antenna terminal according to the output in the transmission step. .

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