JPH11122127A - Remote feeding adjustment device for antenna - Google Patents

Abstract

PROBLEM TO BE SOLVED: To remotely wirelessly adjust variable capacitors which are provided in a loop antenna for the adjustment to an object operating frequency for transmission reception of the antenna and provided to a feeding part of the antenna for impedance matching adjustment of a feeding section. SOLUTION: A control section that is directly coupled with a variable capacitor provided to a loop antenna 10 to vary the capacitance, and reception control sections (a reception control section 17 for frequency and a reception control section 8 for feeding) are provided to the former control section to receive an optical signal for controlling the control section and to decode it. The reception control section allows a command signal generating section 13 to generate a control signal to command the change of the capacitance of the variable capacitor. This signal is changed into an optical signal and transmitted, and the optical signal is received by the reception control section and converted into a control signal to vary the capacitance of the variable capacitor thereby adjusting remotely feeding and the frequency of the loop antenna 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001] The present invention is mainly used for adjusting a tunable small loop antenna (hereinafter referred to as a loop antenna) used for transmitting and receiving radio waves of amateur radio to a working frequency. The present invention also relates to a device for remotely adjusting impedance matching of a power supply unit with an antenna installed.

2. Description of the Related Art As shown in FIG. 2, one variable capacitor (hereinafter referred to as a variable capacitor) provided in ten loops as shown in FIG.
It is necessary to tune to the target frequency at, so first adjust the frequency by manually connecting the variable condenser (not shown) to connect the long insulating rod to the rotor and extending it to a distant place because the variable condenser is manually operated It is common practice to manually rotate this and turn the variable condenser to achieve synchronization. However, due to the nature of the antenna, it is desired to perform tuning adjustment from a location distant from the installed antenna, and there is a method of using a motor for the power to rotate the variable condenser although the cost increases. It is Figure 2
The motor of 4 is connected to the rotor of one variable condenser of 24 frequency adjusters through the deceleration gear of 3 and the motor is driven to the motor control command section of 26 at a remote place.
The motor power cable is extended, and the rotation power and the rotation command are manually supplied from the motor control command unit 26 by the power supply for supplying the rotation power to the motor, and the S /
A low-power radio wave is supplied to the 20 feeder rings of the antenna via 18 coaxial cables through the WR meter, and the indication of the 17 SWR meter is adjusted to be the minimum at the target frequency. A method of automatically controlling this system to tune the loop antenna has also been used.

[Problems to be Solved by the Invention] In the above-described conventional method of adjusting a loop antenna, a method of manually turning the rotor of the variable condenser of FIG. 2 directly with an extended insulating rod (not shown) is as follows. Although it is simple and good, the installation position of the loop antenna is limited because it depends on the position where the insulating rod can be installed, and the distance extended by the insulating rod is also limited. Therefore, the method of rotating the variable condenser by decelerating the rotation of the motor 4 by the deceleration gear 3 shown in FIG. 2 is a practical method.
But to control the power and rotation to drive the motor 2
Since 5 motor control cable lines are always required, 25 motor control cables for wired connection to 24 frequency control sections of the loop antenna and 26 motor control command sections at a distance are costly to manufacture the loop antenna. There are the following items that cause an increase. It is necessary to strengthen measures for electrical insulation between the variable condenser and the motor. Measures must be taken so that noise generated by the motor does not get on the loop antenna. Measures to eliminate self-waves on 25 motor control cables (hereinafter referred to as control lines) Necessary (measures to prevent interference to home electronic equipment) Waterproofing of 25 control line lead-out sections from 24 frequency adjustment sections is required 25 Antenna structure reinforcement for 25 control line weight increase is required Further, this tuned loop antenna The characteristics of this are that the transmission / reception efficiency deteriorates even slightly away from the frequency tuning point, and that the diameter of the ten loop antennas increases (1
If the size of the 20 power supply unit rings (about m or more) is not changed for each intended use frequency band (for example, 14, 18, 21 MHZ band), the impedance with the coaxial cable to be supplied shifts, so that optimal power supply cannot be performed. Therefore, in many cases, even if the user has a frequency adjusting device, the user is content to use only a single frequency band when the optimum adjustment is first performed on the ground.

[Means for Solving the Problems] In order to solve the above-mentioned factors causing an increase in cost, the present invention relates to a motor control of a motor 26 at a position distant from the frequency adjuster 24 of the loop antenna shown in FIG. 25 that had a wired connection to the command section
The use of an infrared remote control system as a means of wirelessly controlling the 24 frequency adjustment units by eliminating the wired part of the control line makes it completely electrically insulated, making it almost unnecessary to take measures against the above-mentioned problems, and always adjust the tuning frequency. Can be performed remotely. By using the remote control means of the infrared remote control system for the power supply unit, an antenna which can use the power supply unit ring common to the multi-bands and can always remotely and optimally control the power supply unit for the frequency in each frequency band is provided. I can do it.

[Operation] By making the control line wireless as in the present invention, the weight of the loop antenna itself is reduced, and there is no control line, so that there is no restriction on the installation location of the loop antenna, and the antenna is manufactured. The measures for the above-mentioned various problems are almost unnecessary and the cost can be reduced. In addition, since remote power supply adjustment can be performed for each use frequency, radio interference due to unnecessary radiation can be minimized.

[Embodiment] FIG. 1 is a block diagram showing a loop antenna of a remote power supply adjusting device for an antenna according to the present invention, and will be described with reference to FIG. First, 10 is a main body of the loop antenna, and a frequency control variable condenser of 1 is inserted into the loop to make the resonance frequency determined by the capacitance C and the inductance L of the loop antenna coincide with the intended use frequency. Power supply of radio waves from transceivers
The ground side and the other end of the 20 power supply unit rings connected to one side of the antenna are connected to 19 connectors through 2 power supply adjustment variable condensers, and connected to 16 transceivers by 18 coaxial cables. That is, it is called a gamma match in which the impedance matching between the 20 power supply ring and the coaxial cable is adjusted by the 2 power supply adjustment variable condenser and the radio wave is optimally supplied to the 10 loop antennas. At the time of actual adjustment, before connecting the 18 coaxial cables to the 16 transceivers, 17 SWR meters (Standing)
Wave Ratio meter) and SWR when the low frequency radio wave of the target frequency is transmitted from 16 transceivers
Adjust the frequency with one variable condenser so that the indication of the meter approaches the minimum (1.0), and adjust the power supply optimally with two variable condensers, and
When the SWR meter 7 shows the minimum value, it is the resonance frequency of this loop antenna, and it indicates that the radio wave transmitted from the 16 transceivers via the 18 coaxial cables is in an optimum matching state with this antenna. In the method shown in FIG. 2 of the related art described in [Problems to be Solved by the Invention], it is necessary to provide an antenna with various measures described there. This is because the loop antenna installed in the air is a 25 control line that is wired between the 26 frequency control units and the 26 motor control command units that need to be operated by the 16 transceiver units on the ground as shown in FIG. Connected by Therefore, it is natural that the high-frequency high voltage generated from the loop antenna at the time of transmission is applied to 25 control lines to 24 frequency adjustment units of one variable condenser constituting the antenna.
That is, apart from the power supply coaxial cable, a ground potential is provided immediately adjacent to the antenna, and the above-described measures are indispensable. Therefore, in the present invention, 25 control lines are eliminated. This embodiment will be described with reference to FIG. 1. The reception control unit for frequency 7 and the reception control unit 8 for power supply shown in FIG. And an optical signal generator 11 for transmitting an optical signal to them in common, and further issues an adjustment command to one frequency adjustment variable condenser and two power supply adjustment variable condensers (hereinafter referred to as variable condensers).
3 is provided. The receiving control units 7 and 8 receive the infrared signal and convert it into an electric signal. The light receiving unit 6 decodes the converted electric signal, generates an operation signal corresponding to the signal, and operates a relay or the like. The motor 4 is rotated to decelerate the rotation with the deceleration gear 3 and then transmitted to the variable capacitors 1 and 2 to variably control the capacitance of the capacitor. Then 3
The planetary gear that can align the inlet and outlet of the rotational force in a straight line is suitable for the deceleration gear. Of course, a normal deceleration gear may be an experimental value, but the reduction ratio of the motor rotation is about 1 to 2 rp.
It is sufficient to set the m-th position to a device suitable for adjustment and close to this. The eleven optical signal generators for generating infrared signals have four command signal generators 21 from the key input part 21 of the thirteen command signal generators.
The motor rotation control command is encoded by the optical transmitter IC 22 described in FIG. 3, converted into a code signal of an electric signal, the carrier signal is modulated, the signal is amplified by the output amplifier circuit 23, and the transmission cable 12 is transmitted. Thus, the configuration is such that electric power is transmitted to the nine LEDs of the eleven light signal generators and the nine LEDs (light emitting diodes) emit infrared rays. FIG. 3 shows a block diagram of the reception control unit for generating an optical signal of a signal including a signal command and receiving the optical signal as the details just described. In FIG. 3, a signal input unit 21 for variably controlling a variable condenser is detected by a key input unit 21 of a command signal generation unit 13 shown in FIG. 3, and a pulse train code signal determined by an optical transmitter IC (semiconductor integrated circuit) 22 To the optical transmitter IC
And 31 carrier oscillating elements that become light carriers with 38
, A signal of 40 KHZ is separately formed and inputted to a carrier synthesizing circuit to perform pulse width modulation with a code signal of a control signal for variably controlling a variable condenser for transmitting the carrier signal. The output pulse-modulated signal is amplified by 23 output amplifier circuits and connected to 9 LEDs, which are infrared light emitting diodes of about 940 nm, of 11 optical signal generators by 12 transmission cables to emit infrared light. The optical signals are sent to the reception control units 7 and 8 as 14 optical signals. On the other hand, the reception control units 7 and 8 receive the 14 optical signals at the 6 light receiving units, which are not shown, but the 6 light receiving units first convert the pulse train of the light pulse modulated by the photodiodes into electric signals, And removes unnecessary signals through a band-pass filter circuit at the center of 38 to 40 KHZ, detects with a detection circuit, shapes each signal width into a rectangular wave, and outputs it as a pulse width train signal. This pulse width train signal is transmitted to 32 optical receivers I.
Input to C, decode and output the pulse train, operate the relays of the corresponding 33 relay operation circuits and determine the rotation direction of the 4 motors. The motor 4 is rotated to transmit the rotation, and the rotation decelerated by the deceleration gear 3 is transmitted to the variable condensers 1 and 2 to change the capacitance of the capacitor. And 22 transmitter ICs and 32 receiver ICs
Refers to a semiconductor integrated circuit, and these ICs are commercially available, for example, model names TC9148 and TC9 of Toshiba Corporation.
149 or the like can be used. The light receiving section 6 is also available on the market in the form of a unit for the same purpose, so that it can be used. Next, FIG. 4 shows the details of the motor drive circuit of the fourth embodiment of the present invention. Since the reception control units 7 and 8 of the present invention are always installed in the air as a part of the antenna and used, it is necessary to appropriately secure the drive energy of the reception control unit. This is, of course, possible but would depart from the purpose of the present invention. Therefore, in the embodiment, the voltage obtained by reducing the cost of the battery by using 50 solar cells is not doubled by the booster circuit of 51, and the voltage obtained by the booster circuit of the solar cell is doubled by 35. Floating charging. Actually, 50 solar cells use a rated voltage of 3 V and 200 mA output, and a step-up circuit of 51 is a charge pump IC (for example, model name M of Maxim Japan).
AX660) to double the battery of 35 drive power supply through 53 diodes for backflow prevention. Therefore, the battery of the embodiment shown in FIG.
The four Vs are connected in series to use 4.8 V, and for the purpose of increasing or decreasing the rotational torque of the motor 4, for example, an output is taken from 2.4 V and 1.2 V of this battery and supplied to the motor. The control circuit 54, which is the contents of the reception control circuit for moving the relay contacts 55, 56, and 57 in FIG. 4, is not shown. By changing the intensity of the voltage applied to the motor 4 by the contact 1 of the motor, the rotation speed can be changed, the motor 4 is operated by turning on the relay contact 2 of 56, and the relay contact 3 of 57 is switched. The rotation direction can be changed by changing the polarity of the voltage applied to the motor. Figure 1 shows the operation of each relay.
The target command is issued from the 13 command signal generators and transmitted to the 11 optical signal generators, and the 14 optical signals are sent to the reception control units 7 and 8 for decoding and operation of each relay. It is a translation. The transmission of the control optical signal to the reception control unit 7 or 8 of the loop antenna installed is only about 10 m away from the operator from the 13 command signal generation unit, and within the field of view of that person. If there is, the configuration is such that the twelve transmission cables connected to the 23 output amplifier circuits of the thirteen command signal generators shown in FIG. 3 are omitted and the eleven optical signal generators are combined, and the thirteen command signal generators are provided. It is also possible to provide a configuration in which 9 LEDs are provided to directly generate optical signals, and 14 optical signals are transmitted to the 7 and 8 reception control units for control. This is because the standard of the reachable distance of the controllable infrared light signal of the infrared remote control method described in the embodiment is about 10 m and the method of using a command from the room outside the line of sight is used as described above. This is how the system was realized. In addition, the size of the loop antenna of Example 10 is a width 2 of aluminum material.
A commercially available long flat plate having a thickness of 2 mm and a thickness of 2 mm is processed into a ring, a 50-PF variable condenser is used for a frequency adjustment variable condenser for one ring having a diameter of 1.1 m, and a power supply ring of 20 is used for two.
14 MHZ, 18 using a 250 PF variable condenser as a power supply adjusting variable condenser for a 2 mm diameter copper wire ring with a diameter of 20 cm.
It is possible to completely adjust the SWR measurement value to approximately 1.0 for each frequency of MHZ and 21MHZ. The combinations of values such as the above-mentioned antenna diameter, material, shape, capacitor capacity, operating frequency and the like are free and are not particularly limited. Next, a method of actually using the above-described remote control device for adjusting the frequency of the loop antenna and the power supply unit will be described mainly with reference to FIG. First, although an example of the antenna installation is not shown, a non-metallic ball, such as glass fiber, is suitable for the installation ball, and the six light receiving units of the reception control units 7 and 8 are arranged, for example, at the lower part. The antenna is vertically mounted on a pole vertically with the adjustment variable condenser section at the top and the power supply adjustment variable condenser section at the bottom, and 14 optical signals from the 11 optical signal generators are The method of arranging them at a position where they can be simultaneously transmitted to both of the reception control units is most suitable and easy to handle. At this time, if it is not possible to arrange the 14 optical signals from the 11 optical signal generators in a position where they can be simultaneously transmitted to both the 7 and 8 reception controllers, a plurality of 11 optical signal generators are provided and not shown. It is sufficient to select 11 optical signal generators at hand. Then, 18 coaxial cables connected to 19 connectors of the 8 power supply reception control units of the antenna of FIG. 1 are installed up to, for example, indoor equipment where the operator is located, and then connected to 17 SWR meters and then to 1 SWR meter.
6 is connected to the transceiver. While receiving the target frequency with the 16 transceivers, a rotation command is issued from the 13 command signal generator to the 1 frequency adjustment variable condenser, and the optical signal is transmitted from the 11 optical signal generator to the 7 reception controller to transmit the 1 frequency. The adjustment variable condenser is moved so that the reception noise of the 16 transceivers is maximized. Next, the 16 transceivers are set to the transmission state to transmit radio waves of a low power target frequency, and fine adjustment is further performed by one frequency adjustment variable condenser so that the SWR meter of 17 becomes the minimum value. Next, a rotation command is issued from the command signal generator 13 to the power supply adjusting variable condenser 2, an optical signal is transmitted from the optical signal generator 11 to the reception controller 8, and the power supply adjusting variable condenser 2 is moved, and the SWR meter 17 is turned on. Further, the impedance is adjusted between the antenna unit and the transmitter / receiver by performing the adjustment using the power supply adjustment variable condenser 2 so as to be the minimum value. This is a measure for efficiently transmitting a radio wave to the antenna since a standing wave does not occur in the coaxial cable for power supply if perfect matching is achieved. An automatic adjustment system for adjusting the series of operations so that the value of the 17 SWR meter is minimized by adding a computer can also be configured. Also, it goes without saying that the antenna matching method according to the remote feeding method of the present invention can be applied to other Yagi-based antennas.

[Effects of the Invention] As described above, according to the present invention, since the control line for the purpose of adjusting the frequency of the loop antenna from a remote location can be wirelessly provided, the installation position can be freely selected and the antenna can be manufactured. In addition, since the variable control mechanism for adjusting the frequency and the variable control mechanism for adjusting the power supply are located in the air where they are completely erected, the electrical insulation between them and the ground does not need to be considered so much. And, of course, there is no control line for the motor, so there is no need to take countermeasures against noise, electromagnetic interference to other equipment, and waterproofing of the control line lead-out part, which were considered in the above-mentioned conventional technology. It is possible to provide an antenna that is lightweight, easy to handle, and capable of reducing costs. And since the feeding of the antenna can be adjusted remotely, there is no misalignment due to the difference between the antenna adjustment location and the installation location, which is conventionally performed when installing the antenna, and therefore the standing wave at the time of transmission to the radio wave power supply coaxial cable is also eliminated. It is possible to provide an efficient antenna system that can always be adjusted for each frequency used without standing up, so that power loss and interference can be minimized.

[Brief description of the drawings]

FIG. 1 is a block diagram of a loop antenna according to an embodiment using a remote feeding adjustment device for an antenna according to the present invention.

FIG. 2 shows a block diagram of a prior art loop antenna system and adjustment method.

FIG. 3 is a block diagram of a reception control unit for generating an optical signal and receiving the optical signal, including a command signal generation unit, according to an embodiment of the remote power supply adjustment device for an antenna of the present invention.

FIG. 4 shows an embodiment of a motor drive control circuit of the remote power feeding adjustment device for an antenna according to the present invention.

[Description of sign]

DESCRIPTION OF SYMBOLS 1 Frequency adjustment variable condenser, 26 motor control command part 2 Power supply adjustment variable condenser, 3 Reduction gear, 31 Carrier oscillation element 4 Motor, 32 Optical receiver IC 5 Reception control circuit, 33 Relay operation circuit 6 Light receiving part, 34 Direction control circuit 7 Frequency Receiving control unit for 35, driving power supply 8 receiving control unit for power supply, 9 LED, 10 loop antenna, 50 solar cell 11 optical signal generating unit, 51 booster circuit 12 transmission cable, 13 command signal generating unit, 53 diode 14 optical signal , 54 control circuit 16 transceiver, 55 relay contact 1 17 SWR meter, 56 relay contact 2 18 coaxial cable, 57 relay contact 3 19 connector 20 power supply ring 21 key input unit 22 optical transmitter IC 23 output amplifier circuit 24 frequency adjustment Part 25 Motor power cable

Claims (2)

[Claims] 1. An antenna for adjusting the optimum power supply at a target operating frequency by changing the capacity of a variable capacitor provided in a feeding section of the antenna, means for directly controlling the capacity by directly connecting to the variable capacitor, and A reception control means provided on the side of the variable capacity control means for receiving and decoding a signal for variably controlling the capacity by an optical signal and variably controlling the capacity, and a reception control means provided in a place different from the antenna and provided in the reception control means A command signal generating means for generating a command for changing the capacity by an electric signal, and provided in the field of view of the reception control means at a position further distant from the command signal generating means, and receiving the electric signal from the command signal generating means. The antenna remote control unit is characterized in that impedance matching adjustment of an antenna feed unit comprising one or more optical signal generating means for converting to an optical signal and transmitting the optical signal to the reception control means can be performed remotely. Remote power supply adjustment device. 2. A variable capacitor which is provided in a loop antenna and adjusts a target operating frequency by changing a capacitance, and a variable capacitor which is provided in an antenna feed portion and adjusts impedance matching is directly connected to both. Means for variably controlling the capacities and receiving and decoding signals for controlling the capacities provided on the variable control means for the respective capacities with an optical signal and for variably controlling the capacities for frequency adjustment and power supply adjustment Command signal generating means for providing a variable capacity command to each of the reception control means by an electric signal, provided in a separate location from the antenna, One or more optical signals which are provided in the field of view of the reception control means at a further distant place, receive an electric signal from the command signal generation means, convert the signal into an optical signal, and transmit the optical signal to the reception control means. Loop comprising generating means
Adjusting the frequency of use of the antenna and the impedance of the feeder
An antenna adjustment device characterized in that matching can be adjusted remotely.