JPH0730983A - Radio wave interference alarm device - Google Patents

Abstract

PURPOSE:To prevent the interference with another equipment when a radio controller is operated. CONSTITUTION:A radio interference alarm device 6 has a receiver 7 for detecting radio wave of the frequency which is the same as that of the radio wave to be used in the operation of equipment in use and an electric field intensity meter 8 which is arranged in the vicinity of the output antenna 4e of the transmitter 4 of the equipment in use and is capable of detecting only radio waves transmitted from the transmitter 4 of the equipment in use for an arbitrary frequency. As radio waves are detected by the both of the receiver 7 and the electric field intensity meter 8 when the power source switch 4a of the transmitter 4 of the equipment in use is turned on when the transmitter of another equipment transmits the radio waves of the frequency which is the same as that of the radio wave to be used for the equipment in use, it can be judged that an interference occurs. When the other equipment does not transmit radio wave of the same frequency, the receiver 7 does not detect radio waves at a point of time when the power source switch 4a of the transmitter 4 is turned on (A time difference is imparted so that the transmitter 4 may start the transmission of radio waves little later after power source switch is turned on). Thus, it is judged that an interference does not occur.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly relates to radio waves used to control other devices when controlling a radio control device which is remotely controlled by radio waves using a specific frequency, that is, a radio control device. The present invention relates to a radio wave interference warning device for preventing radio wave interference used for maneuvering.

[0002]

2. Description of the Related Art Radio-controlled radio controlled aircraft using radio waves include helicopters, airplanes, ships, automobiles, etc.
There are various types, and they are used in various ways, from hobby to practical work. The radio waves that can be used to operate these radio-controlled aircraft are limited to specific frequency bands.For example, multiple radio-controlled aircraft companions gathered in one playground, etc., and multiple radio-controlled aircraft were operated at the same time. In such a case, it is necessary to take care so that the used bands (frequency) of each radio control machine do not overlap. Normally, the radio control companions who gather together ask each other for their band and ask for their consent, and keep in touch to prevent the same band from being used at the same time. Impossible).

As a measure for preventing the above-mentioned inconvenience, the band monitor 1 shown in FIG. 7 is conventionally used. The band monitor 1 is a device that detects radio waves of a specific frequency used for operating a radio controlled machine for each band, and notifies the band in use by turning on a display lamp 2 provided for each band. In addition, in FIG.
Reference numeral 3 is an antenna for receiving radio waves. Also,
The band monitor 1 shown is 0.02MHz in the 40MHz band.
It is intended to monitor 8 bands.

[0004]

However, the conventional band monitor 1 merely detects the band in use, and the power switch of the transmitter of the user's own device which uses the band already in use is set by the user. Even if it is mistakenly entered or inadvertently entered, it is not possible to warn of duplicate use of the same band caused by it, so there was a problem that it fell into a no-con due to interference. Also, this type of band monitor 1 is expensive.

The present invention has been made in view of the above circumstances, and in the case where the same band is repeatedly used, the operator can be immediately notified of the occurrence of the situation, and an accident of falling into a no-con due to interference It is an object of the present invention to provide a radio wave interference warning device capable of preventing the occurrence of noise at an extremely low cost.

[0006]

SUMMARY OF THE INVENTION The present invention for solving the above-described problems, when operating a radio-controlled radio controlled by radio, controls interference between radio waves used to control the radio itself and radio waves transmitted from others. A radio interference warning device for preventing,
It is placed near the output antenna of the receiver for detecting the radio wave of the same frequency as the radio wave that is going to be used for controlling the own machine, and the transmitter for the remote control of the own machine,
An electric field strength meter capable of detecting only radio waves emitted from its own transmitter, and a judgment circuit for judging occurrence of interference by logical processing based on the output signal of the receiver and the output signal of the electric field strength meter, And a warning means for notifying the operator of the aircraft of the occurrence of interference when the determination circuit determines interference.

[0007]

In the radio interference warning device having the above structure, for example, when another transmitter is already using the band used by the transmitter of the own device, the transmitter of the own device is turned on to cause duplicate use of the same band. Includes a judgment circuit that logically processes the output signal of the receiver that has already detected the use of radio waves in other devices and the output signal of the electric field strength meter that has detected the transmission of the transmitter of the own device, and promptly generates interference. Is detected and the operator is immediately notified by a warning means.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 to 3 are configuration diagrams of a radio interference warning device according to an embodiment of the present invention. In these figures, reference numeral 4
Is a transmitter for remote control that sends a radio wave as a control signal to its radio controlled device, 5 is a transmitter stand for mounting the transmitter 4, and 6 is an embodiment of the present invention This is a radio interference warning device. On the front of the transmitter 4,
As shown in FIGS. 2 and 3, a power switch 4a, left and right sticks 4b and 4c for controlling, and an output meter 4d are arranged, and an output for outputting a radio wave as a control signal is provided on the upper surface portion. The antenna 4e is arranged. The transmitter stand 5 is a stand that is placed when the transmitter 4 is not used.

The radio wave interference warning device 6 is a receiver for detecting a radio wave transmitted from a transmitter of another machine and having the same frequency as a radio wave to be used for controlling the own machine (however, the transmitter of the own machine). A radio field intensity meter which receives a radio wave from 4) and a weak electric field intensity meter which is arranged near the output antenna 4e of the transmitter 4 of the own machine and can detect only the radio wave transmitted from the output antenna 4e for an arbitrary frequency. 8, a judgment circuit 10 for judging the occurrence of interference by a logical process based on the output signal of the receiver 7 and the output signal of the electric field intensity meter 8, and the occurrence of interference when the judgment circuit 10 determines interference. Is provided in the housing 5a of the transmitter stand 5 and is turned on / off by a switch 6a arranged on the upper surface of the transmitter stand 5. Turn off Door can be.

The receiver 7 receives radio waves in the frequency band allocated for radio control from the radio control station and outputs a detection signal. As shown in FIG. 3, the receiver 7 is provided on the upper surface side of the transmitter stand 5. , A receiving antenna 7a and a band setting dial 7 for designating a band (frequency) to be detected
b and a reception confirmation meter 7c showing the reception level of the frequency designated by the band setting dial 7b are arranged. This receiver 7 corresponds to the transmitter 4
Within the reach of the radio wave output by another transmitter of the same level as the above, it has a receiving ability to the extent that the radio wave of the frequency of the band designated by the band setting dial 7b can be detected.

The electric field intensity meter 8 has a structure in which the receiving antenna 8a is arranged on the upper surface side of the transmitter stand 5. This electric field strength meter 8 is, for example, the receiving antenna 8 described above.
It is a radio wave detection circuit having an ability to show a constant response regardless of frequency only when the radio wave source is within a radius of 50 cm from a. Compared with the receiver 7, it is an amplification circuit or a tuning circuit. It has no circuit and can be manufactured at a low cost with a much simpler circuit configuration. The reception range (for example, 50 cm) of the electric field intensity meter 8 is within the reception range centered on the reception antenna 8a when the transmitter 4 is placed on the transmitter stand 5. Output antenna 4e
Is set to exist.

In the case of this embodiment, the warning means 9 is, as shown in FIGS. 1 and 2, a warning lamp 9a for visually notifying the occurrence of interference (that is, the occurrence of duplicate use of the same band). And a buzzer 9b that gives an audible notification.

The judgment circuit 10 detects the occurrence of the interference state by the logical processing of the output signal of the receiver 7 and the output signal of the electric field intensity meter 8, and when the occurrence of the interference state is detected, the warning is issued. The means 9 is operated. The occurrence of the interference state means that the band already used by another device,
It occurs when the player uses it later. If the switch 6a is turned on in advance, the receiver 7 detects the radio wave of the designated band, while the electric field intensity meter 8 causes the transmitter 4 mounted on the transmitter stand 5 to have an arbitrary frequency. Since only the radio wave transmitted from the device is detected, the occurrence of the above-mentioned interference state means that the electric field intensity meter 8 is in the transmitter 4 of its own machine while the receiver 7 has already detected the radio wave of the designated band. It means the case where the radio wave output is detected. Based on this idea, the judgment circuit 10 logically processes the output signal of the receiver 7 and the output signal of the electric field intensity meter 8. When the output signals of the receiver 7 and the electric field intensity meter 8 are digital signals, they are logically processed as they are, but when they are analog signals, they are logically processed after being converted into digital signals by an A / D converter. When the power switch 4a of the transmitter 4 is turned on, this means that the electric field strength meter 8
Not only this, the receiver 7 is also detected at the same time, so the output signal of the receiver 7 is logically processed after being slightly delayed. With such measures, it becomes possible to identify the case where the receiver 7 detects the radio wave of the designated band by turning on the transmitter 4 of the own machine while the other machine is not in use, and the occurrence of interference is detected. Will be able to do it. The determination circuit 10
4 may have a function as a logical product circuit as shown in FIG. 4 as the logical processing, but as described above, because of the logical processing by delaying the output signal of the receiver 7, for example, It is preferable to use a D-type flip-flop circuit.

FIG. 5 shows the operation of the radio wave interference warning device 6 when the switch of the transmitter 4 of the own device is turned on in a state where the band previously designated by the band setting dial 7b is not used by another device. It is a thing. Further, FIG. 6 shows the operation of the radio interference warning device 6 when the switch of the transmitter 4 of the own device is turned on in the state where the other device is using the band previously designated by the band setting dial 7b. It is a thing. In FIGS. 5 and 6, the alternate long and short dash line hanging from the ∇ mark is the timing when the power switch 4a of the transmitter 4 of the own device mounted on the transmitter stand 5 is turned on, and (a) is The output signal of the receiver 7 is shown delayed by a time t, (b) shows the output signal of the electric field intensity meter 8, and (c) shows the output signal of the judgment circuit 10. As shown in FIG. 6, when the power switch 4a of the transmitter 4 of the own device is turned on while another device is already using the designated band, the output of the determination circuit 10 becomes “High”. The warning means 9 is activated by this, and the warning lamp 9a
Is lit and the buzzer 9b sounds to notify the operator of the occurrence of interference.

As described above, if the radio interference warning device 6 is used, when the same band is used repeatedly,
As the operator is immediately notified of the occurrence of the situation,
Even if the transmitter 4 is turned on carelessly, it is possible to prevent the occurrence of the accident of falling into a no-con due to interference. In the above embodiment, the warning means 9
Although the warning light 9a and the buzzer 9b are provided as the above, only one of them may be provided.

[0016]

According to the radio wave interference warning device of the present invention, for example, when the band used by the transmitter of the own device is already used by another device, the transmitter of the own device is turned on to use the same band redundantly. In the case of occurrence of, the occurrence of interference is promptly detected based on the output signal of the receiver and the output signal of the electric field strength meter, and the operator is immediately notified by the warning means. Therefore, even if the transmitter is inadvertently turned on, it is possible to prevent the occurrence of an accident such as a no-con due to interference. Further, the radio wave interference warning device of the present invention can be manufactured at an extremely low cost as compared with the conventional band monitor.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of a radio wave interference warning device of the present invention.

FIG. 2 is a front view of the radio wave interference warning device.

FIG. 3 is a plan view of the radio interference warning device.

FIG. 4 is an explanatory diagram of a logical process of a determination circuit in the radio interference warning device.

FIG. 5 is a timing chart showing one mode of operation in the radio interference warning device.

FIG. 6 is a timing chart showing another mode of operation of the radio interference warning device.

FIG. 7 is an explanatory diagram of a conventional band monitor.

[Explanation of symbols]

 4 transmitter 4a power switch 5 transmitter stand 6 radio interference warning device 6a switch 7 receiver 7a receiving antenna 7b band setting dial 8 electric field intensity meter 8a receiving antenna 9 warning means 9a warning light 9b buzzer 10 judgment circuit

Claims (1)

[Claims] 1. A radio interference warning device for preventing radio waves used for controlling the radio and radio waves transmitted from others when piloting a radio controlled radio controlled aircraft, comprising: It is placed near the receiver for detecting the radio wave transmitted from the same frequency as the radio wave to be used for controlling the own machine, and the output antenna of the transmitter for remote control of the own machine. An electric field strength meter capable of detecting only radio waves transmitted from a transmitter, a judgment circuit for judging occurrence of interference by logical processing based on an output signal of the receiver and an output signal of the electric field strength meter, and the judgment circuit And a warning means for notifying the operator of the aircraft of occurrence of interference when it is determined that interference has occurred.