JPH069697U - Radio control device receiver - Google Patents

Abstract

(57) [Summary] [Purpose] The frequency selected when the power is turned on can be fixedly set as the reception frequency until the power is turned off next time. [Structure] When the power is turned on with the number of bands of the desired frequency selected by the combination operation of the two switches, after checking the frequency groups that can be used by the receiver, the selected band information is displayed. It is determined whether or not the frequency data captured and corresponding to the band information is a normal frequency. As a result of this determination, the frequency division ratio of the frequency divider in the PLL circuit is determined based on the frequency data stored in the storage means, and the frequency at the time of lock-in based on this frequency division ratio is the next power supply as the reception frequency. The setting is fixed until is cut.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a receiver of a radio control device mounted on a radio controlled model of an airplane, a car, a ship or the like which is remotely controlled, for example.

[0002]

[Prior art]

 In this type of conventional radio control device, AM and FM modulation methods are used as carrier waves, and signal formats such as PPM and PCM are used. In the radio control device, the frequency bands that can be used as shown in [Table 1] and [Table 2] below are set to 27 MHZ and 40 MHz band in Japan, and a plurality of frequencies are determined in each band. Has been.

[0003]

[Table 1]

[0004]

[Table 2]

That is, in the 27 MHz band, as shown in [Table 1], there are 6 bands at intervals of 50 KHz from 26.995 MHz to 27.245 MHz (however, band 6 has a common band of 27.245 MHz and 27.255 MHz). Used as)). Also, in the 40 MHz band, as shown in [Table 2], the band is divided into 13 bands at intervals of 20 KHz from 40.61 MHz to 40.85 MHz.

By the way, if a plurality of steered bodies operate simultaneously in the same area, there is a risk of interference with other steered bodies, so it is necessary to change the frequency setting. The crystal oscillator called a crystal was exchanged so that the band used in the product would be different.

Therefore, in the conventional radio control device, since the crystal oscillator is used to change the reception frequency, the operator has a spare crystal oscillator of a different frequency in order to avoid interference with other controlled objects. I had to carry around. In order to solve this problem, in recent years, by incorporating a PLL (Phase Locked Loop) circuit generally used in the communication field, development of a radio control device whose frequency can be easily changed has been advanced. .

[0008]

[Problems to be solved by the device]

 By the way, in a frequency synthesizer type radio control device incorporating this PLL circuit, for example, the frequency switching adjustment can be easily performed by changing the frequency division ratio of the frequency divider by switching the dip switch. When the device is operating, if the switch is switched and the division ratio is changed, the reception frequency is switched at any time.

Therefore, when the controlled object is, for example, a car, vibration applied to the vehicle body depending on the road surface condition during traveling, vibration of the engine loaded on the controlled object, and further, when the frequency is once set and then the operation is performed by mistake. When the switch is switched due to some action on the steered body, the frequency division ratio changes and the reception frequency switches, which does not match the frequency of the transmitter used until then. Had a problem of being in an uncontrollable state.

Therefore, the present invention has been made in view of the above-mentioned problems, and its purpose is to set the frequency selected at the start-up of a power supply as a fixed reception frequency until the power is turned off next time. In the meantime, it is to provide a receiver of a radio control device in which the reception frequency once set does not intentionally change.

[0011]

[Means for Solving the Problems]

 In order to achieve the above object, a receiver of a radio control device according to the present invention is a receiver of a frequency synthesizer type radio control device using a PLL circuit that controls an oscillation frequency based on a phase difference from a reference signal. , A frequency selecting means for selecting a predetermined frequency from a plurality of predetermined frequency data, and a frequency setting means for fixedly setting the reception frequency to the frequency selected by the frequency selecting means when the power is turned on. It is characterized by having.

[0012]

[Action]

 When the power is turned on with the predetermined frequency selected from the plurality of frequency data determined in advance by the frequency selection means, the frequency setting means changes the frequency division number of the frequency divider in the PLL circuit. Then, the reception frequency is fixedly set to the frequency selected by the frequency selection means.

[0013]

【Example】

 FIG. 1 is a block diagram showing an embodiment of a receiver of a radio control device according to the present invention, and FIG. 2 is an external view of the receiver.

The receiver in this embodiment is mounted on a radio controlled model of an airplane, a car, a ship, etc. as a controlled object to be remotely controlled, and includes a power source 1, an antenna 2, a first amplifying means 3, and a frequency selecting means. 4, frequency changing means 5, mixing means 6, second amplifying means 7, state detecting means 8, storage means 9, control means (CPU) 10, and frequency changing means 5, state detection means 8, storage means. The frequency setting means 11 is constituted by 9 and the control means 10.

Then, this receiver adopts a heterodyne detection method in which a signal to be received and a signal from the frequency varying means 5 are mixed, the frequency-converted signal is lowered to an intermediate frequency, amplified, and then detected. Therefore, the reception frequency is determined with the frequency of the frequency variable means 5 fixedly set when the power supply 1 is started up as the local oscillation frequency.

The first amplifying means 3 is composed of an RF amplifier, which amplifies a signal received via the antenna 2 at a high frequency and outputs it to the mixing means 6.

The frequency selecting means 4 is composed of, for example, two rotary type DIP switches 4a and 4b, and these two switches 4a and 4b of the receiver main body 12 covered by a lid 13 as shown in FIG. It is juxtaposed in the recess 12a. Each switch 4a, 4b selects the band information corresponding to the desired frequency by rotating the adjusting part 4d with respect to the switch body 4c in which the numbers 0 to 9 are equally graduated. The band information of is supplied to the control means 10 via the interface 14.

To further explain, in selecting the frequency, if the combination of scales at the position indicated by the mark 4da of the adjusting section 4d matches the number of bands, for example, if the number of bands is 65, the switch 4a on the left side is The adjustment unit 4d of the two switches 4a and 4b is rotationally adjusted by a driver or the like so that the mark 4da of 4 is aligned with the scale of 6 and the mark 4da of the right switch 4b is aligned with the scale of 5.

The frequency changing means 5 constitutes a PLL circuit including a reference power source 5a, a frequency divider 5b, a phase comparator 5c, a loop filter (low-pass filter) 5d, and a voltage controlled oscillator 5e. The phase of the output of the divided voltage-controlled oscillator 5e is compared with the phase of the reference signal, and the frequency and phase of the voltage-controlled oscillator 5e are controlled by the feedback method based on the phase difference between the two. .

To explain further, in the frequency varying means 5, when the power source 1 is turned on based on the band information of the frequency selecting means 4, the frequency dividing means 5 divides the frequency by the frequency dividing number setting signal S3 output from the control means 10 described later. The frequency division ratio 1 / N of the device 5b is set, and the output fv / N of the voltage controlled oscillator 5e and the reference signal fr from the reference oscillator 5a are divided by the set frequency division ratio 1 / N. Phase comparison is performed by the phase comparator 5c, the error signal is integrated by the loop filter 5d, then converted into an error voltage, and the frequency fv of the voltage controlled oscillator 5e is controlled by the DC voltage proportional to this error voltage. The output signal locked to the frequency fv (= N · fr) that is an integral multiple of the reference signal fr based on the frequency division ratio 1 / N of the device 5b is output to the mixing means 6.

The mixing means 6 mixes the signal amplified by the first amplifying means 3 with a high frequency and the signal from the voltage controlled oscillator 5e whose frequency is fixed and outputs the mixed signal to the second amplifying means 7. There is.

The second amplifying means 7 is composed of an IF amplifier, which lowers the signal mixed by the mixing means 6 to an intermediate frequency and amplifies it, and the amplified signal is processed by a processing circuit (not shown), It is used to drive the servo circuit of each channel connected through the output connector 15 of the receiver main body 12 to control each part of the controlled object.

The state detection means 8 detects the on / off state of the power supply that supplies the necessary drive signal to each circuit, and divides the frequency with respect to the control means 10 while the power supply 1 is turned on. The frequency setting permission signal S1 for permitting the switching of the frequency division number of the device 5b is output.

The control means 10 comprises a frequency discriminating means 10a, a data processing means 10b, a presetting means 10c, and a frequency division number varying means 10d. The frequency discriminating means 10a checks whether or not the band information input from the frequency selecting means 4 via the interface 14 corresponds to usable frequency group data (for example, 27 MHz band, 40 MHz band) and can be used. If it corresponds to the frequency group data, it further determines whether the frequency according to the band information corresponds to the regular frequency, and outputs the data acquisition permission signal S2 to the data processing means 10b.

The data processing means 10b fetches the band information from the frequency selecting means 4 based on the data fetching permission signal S2 from the frequency discriminating means 10a, and the frequency according to the band information corresponds to the regular frequency. In this case, the frequency data of the band information is stored in the storage means 9 in which the addresses are distributed so that the band number in each band and the numbers of the two switches 4a and 4b as the frequency selecting means 4 become equal. I remember.

The preset means 10c stores in the storage means 9 preset frequency data indicating the maximum or minimum value of the frequency within the same band when the frequency according to the band information does not correspond to the regular frequency.

The frequency dividing number varying means 10d is stored by the data processing means 10b or the presetting means 10c so as to vary the frequency dividing number of the frequency divider 5b based on the frequency setting permission signal S1 from the state detecting means 8. The frequency division number setting signal S3 corresponding to the frequency data stored in the means 9 is output to the frequency divider 5b, and the frequency divider 5b determines the frequency division ratio 1 / N by the frequency division number setting signal S3. Then, until the power supply is turned off after the input of the frequency setting permission signal S1 is stopped, the reception frequency according to the frequency division ratio 1 / N is fixedly set.

Next, the frequency setting operation of the receiver having the above configuration will be described based on the flowchart of FIG. First, a desired frequency is selected by operating the two switches 4a and 4b as the frequency selecting means 4 (ST1). For example, in the case of selecting a frequency of 65 bands in the 40 MHz band (40, 65 MHz), the mark 4d a of the left switch 4a in FIG. 2 is set to 6 and the mark 4db of the right switch 4b is set to 5 . Here, when the power supply 1 of the receiver is turned on and turned on (ST2-Yes), the usable frequency group data stored in the receiver is checked (ST3).

Further, the band information selected by the two switches 4a and 4b is taken in (ST4), and it is determined whether the frequency of the band information corresponds to the regular frequency (ST5). If the frequencies correspond (ST5-Yes), the frequency data corresponding to the band information is stored in the storage means 9 (ST6). If the frequencies do not correspond (ST5-No), preset frequency data preset to the maximum or minimum value of the frequency of the band (for example, 40 MHz band) in the same group is stored in the storage means 9. (ST7).

Then, the frequency division ratio of the frequency divider 5b is determined based on the frequency data (or preset frequency data) stored in the storage means 9 (ST8). The frequency locked at this division ratio is set as the reception frequency (ST9), and the reception frequency once set is fixed until the power is turned off (ST10).

Therefore, according to the receiver of the above-described embodiment, when the power is turned on and the power is turned on, the reception frequency is set based on the frequency data selected by the two switches 4a and 4b as the frequency selection means 4. The reception frequency is set to a fixed value until the power is turned off until the power is turned off next time.Therefore, there is no possibility that the once set reception frequency will be deliberately changed due to disturbances such as vibration and erroneous operation. Therefore, it is possible to improve reliability.

By the way, in addition to the configuration of the above-described embodiment, timer means is added, and the two switches 4a and 4b of the frequency selecting means 4 are kept for a predetermined time, for example, several tens of seconds after the power source 1 is turned on. The frequency setting permission signal S1 may be delayed and supplied to the control means 10 so that the frequency can be changed.

[0033]

[Effect of device]

 As explained above, according to the receiver of the present invention, the frequency selected when the power is turned on can be fixedly set as the reception frequency without the risk of intentionally changing it until the power is next turned off. The reliability can be improved.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a receiver of a radio control device according to the present invention.

[Figure 2] External view of the receiver

FIG. 3 is a flowchart showing a frequency setting operation of the receiver.

[Explanation of symbols]

4 ... Frequency selecting means, 4a, 4b ... Switch, 5 ... Frequency varying means, 8 ... State detecting means, 9 ... Storage means, 10 ...
Control means, 11 ... Frequency setting means.

Claims (1)

[Scope of utility model registration request] 1. A receiver of a frequency synthesizer type radio control device using a PLL circuit for controlling an oscillation frequency based on a phase difference from a reference signal, wherein a predetermined predetermined frequency data is selected from a plurality of predetermined frequency data. A receiver of a radio control device, comprising: frequency selecting means for selecting a frequency; and frequency setting means for fixedly setting a receiving frequency to the frequency selected by the frequency selecting means when the power is turned on.