JPH07198769A - Electric field intensity measuring instrument - Google Patents

Abstract

PURPOSE:To easily find the highest receiving level by using a smaller number of diodes. CONSTITUTION:The detecting output of a detecting means 40 is supplied to comparators 42G and 42R and compared with reference voltages respectively generated by a voltage from a sensitivity adjusting section 48 and resistors 422 and 421. The comparator 42R makes a light emitting diode 46R to emit light when the detecting output of the means 40 is higher than the reference voltage and the comparator 42G makes another light emitting diode 46G to emit light when the detecting output is higher than the reference voltage generated across both ends of the resistors 422 and 421. The sensitivity adjusting section 48 arbitrarily changes the values of the reference voltages supplied to the comparators 42R and 42G by changing the voltages supplied to the resistors 421 and 422 by adjusting its variable resistor 482.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric field strength measuring device, and more particularly to a device for displaying electric field strength according to a light emitting state of a light emitting element.

[0002]

2. Description of the Related Art Conventionally, in order to satisfactorily receive radio waves from broadcasting satellites and communication satellites, the azimuth angle and elevation angle of the antennas for satellite broadcasting and satellite communication reception are set so as to be directed to the broadcasting satellites and communication satellites. When adjusting the above, a simple electric field strength measuring instrument may be used. This field strength measuring device inputs the intermediate frequency signal from the converter attached to the antenna for satellite broadcasting or satellite communication reception, and among the many light emitting diodes arranged in a line, There are some that turn on the appropriate number. Therefore, by adjusting the elevation angle and azimuth angle so that the maximum number of light-emitting diodes is turned on,
You can receive satellite communications and satellite broadcasts in the best possible conditions.

[0003]

However, in such an electric field intensity measuring device, the maximum reception level point is difficult to find unless the reception level represented by lighting one light emitting diode is small, so that a large number of light emission is generated. Must use diodes. Therefore, there is a problem that the cost becomes high.

It is an object of the present invention to provide an electric field strength measuring device in which the maximum reception level can be easily found by using a small number of light emitting diodes.

[0005]

In order to achieve the above-mentioned object, the first aspect of the present invention is to detect the received signal, and to provide the detection output from the detecting means. And a second reference signal larger than the first reference signal to the second comparison means and the first comparison means to the second reference signal.
And a first light emitting element which is turned on based on the output of the first comparing means when the detection output is larger than the first reference signal.
Second when the detection output is larger than the second reference signal
A second light emitting element which is turned on based on the output of the comparing means, and the reference signal generating means is configured to be able to change the values of the first and second reference signals in conjunction with each other. Is.

A second aspect of the present invention is a detection means for detecting a received signal, and a first comparison means for generating a comparison output when the detection output from the detection means is smaller than the reference signal.
Second comparing means for generating a comparison output when the detected output is larger than the reference signal, and a peak for inputting the detected signal of the detecting means and supplying the output signal to the first and second comparing means as the reference signal. A holding means; a first light emitting element which is turned on based on a comparison output of the first comparing means;
And a second light emitting element which is turned on based on the comparison output of the comparison means.

[0007]

According to the first aspect of the present invention, the detection output from the detection means is supplied to the first and second comparison means, and the first and second comparison means are provided.
If the detection output is larger than the second reference signal, the first and second light emitting elements are turned on, and if the detection output is between the first and second reference signals, The first light emitting element lights up. The values of the first and second reference signals are
When the electric field intensity measuring device of the present invention is used to direct the antenna toward the transmission source, for example, when the antenna is adjusted so that the first and second light emitting elements are turned on, the The value of the second reference signal is changed so that the first light emitting element is turned on, and then the antenna is adjusted so that the first and second light emitting elements are turned on again. By repeating such work, the antenna can be adjusted to the maximum reception point.

In the second aspect of the invention, the peak hold value of the detection output is used as the reference signal. Therefore, when the current detection output becomes larger than the peak hold value, that is, the maximum detection output up to now, the second light emitting element emits light, and the current detection output exceeds the maximum detection output up to now. When it is small, the first light emitting element emits light. Therefore,
Similar to the first invention, in order to direct the antenna to the transmission source,
When the second invention is used, the direction of the antenna is continuously adjusted so that the second light emitting element always emits light, and then the first light emitting element is used.
When the light emitting element of No. 1 emits light, it can be seen that the maximum receiving point has passed, and therefore, the maximum receiving point can be adjusted by returning the direction of the antenna so that the second light emitting element emits light again.

[0009]

EXAMPLE A first example is shown in FIGS. The electric field intensity measuring device 10 of this embodiment is arranged near an antenna 12 for receiving satellite broadcasting or satellite communication provided outdoors as shown in FIG. The receiving antenna 12 includes, for example, an offset parabolic reflector 16 supported by a column 14.
And a primary radiator 20 with a converter supported by an arm 18 near the focal position of the offset parabolic reflector 16.

The first intermediate-frequency signal whose frequency is converted by the primary radiator 20 with a converter provided at the focal position of the radio wave of satellite broadcasting or satellite communication reflected by the offset parabolic reflector 16 is transmitted through the coaxial cable 22. Is supplied to the input terminal 24 of the electric field intensity measuring device 10 via the electric field intensity measuring device 10, and the electric field intensity level is displayed as described later. Further, the first intermediate frequency signal is supplied to the tuner 30 and the like provided indoors via the output terminal 26 of the electric field strength measuring device 10 and the coaxial cable 28.

The operating power of the electric field intensity measuring device 10 and the primary radiator 20 with a converter is supplied to the electric field intensity measuring device 10 from a predetermined power supply circuit such as a tuner 30 via a coaxial cable 28 and an output terminal 26. Input terminal 2
4, is supplied to the primary radiator 20 with a converter via the coaxial cable 22.

In the electric field strength measuring device 10, as shown in FIG. 3, the first intermediate frequency signal supplied to the input terminal 24 is supplied to the one branching device 34 via the DC blocking capacitor 32. The output signal of the one branching device 34 is supplied to the output terminal 26 via the DC blocking capacitor 36. On the other hand, the branch output signal of the one branching device 34 is amplified by the amplifier 38, the level of the amplified branch output signal is detected by the detection unit 40, and the level comparison and the light emitting diode (LE) are performed.
D) It is supplied to the drive unit 42. The light emitting diode (LED) display unit 44 is turned on by the level comparison and the output signal of the light emitting diode drive unit 42. Reference numeral 48 is a sensitivity adjustment unit that adjusts the level comparison and the sensitivity of the LED drive unit 42.

FIG. 1 shows a detector 40, level comparison and LED.
The detailed circuits of the drive unit 42, the LED display unit 44, and the sensitivity adjustment unit 48 are shown. The detector 40 includes diodes 401 and 4
02, a smoothing capacitor 403, and a detection voltage generation resistor 404. The detection voltage generated in the resistor 404 is amplified by the DC amplification unit 80 and supplied to the level comparison and LED driving unit 42. The direct current amplifier 80 is
It is composed of an operational amplifier 801 and resistors 802 and 803. The DC amplifier 80 may be unnecessary.

The level comparison and LED drive section 42 has two comparators 42R and 42G, and the detection voltage is supplied from the DC amplification section 80 to these non-inverting input terminals. A reference voltage is supplied to the inverting input terminals of these comparators 42R and 42G from the sensitivity adjusting section 48 via resistors 421 and 422. The reference voltage supplied to the comparator 42G is higher than the reference voltage supplied to the comparator 42R. These comparators 4
2R and 42G generate a drive voltage when the detected voltage is higher than the reference voltage supplied to itself.

The sensitivity adjusting section 48 is a constant voltage power source section 481.
And a variable resistor 482 that divides the constant voltage from the constant voltage power supply unit 481. The voltage divided by the variable resistor 482 is supplied to the resistors 422 and 421, which serve as a reference voltage. Occur. Therefore, the value of each reference voltage can be changed by operating the variable resistor 482.

The LED display section 44 has a red light emitting diode 46R and a green light emitting diode 46G, and the red light emitting diode 46R is turned on by the drive voltage from the comparator 42R supplied via the resistor 44R. . Similarly, the green light emitting diode 46G is connected to the resistor 4
It lights up by the drive voltage of the comparator 42G supplied via 4G.

The operating power for the amplifier 38, the level comparison and light emitting diode driver 42, and the light emitting diode display 44 is supplied from the tuner 30 to the output terminal 26 via the coaxial cable 28, and the constant voltage via the high frequency blocking coil 50. The voltage is supplied to the amplifier 38, the level comparison / light emitting diode drive unit 42, and the light emitting diode display unit 44 after being made constant voltage by the power supply unit 52. The operating power is also supplied from the high frequency blocking coil 50 to the converter-equipped primary radiator 20 via the input terminal 24 and the coaxial cable 22.

In this embodiment, when the detection voltage from the DC amplifier 80 is input between the reference voltage applied to the comparator 42R and the reference voltage applied to the comparator 42G, the red light emitting diode 46R is input. Lights up,
When the detected voltage from the DC amplifier 80 becomes higher than the reference voltage of the comparator 42G, both the red and green light emitting diodes 46R and 46G emit light.

Therefore, using this electric field measuring device 10,
For example, when the satellite broadcasting or satellite communication receiving antenna is adjusted in the direction of the satellite, the satellite broadcasting or satellite communication receiving antenna 12 is generally set in the direction of the satellite, and as shown in FIG. It is connected between the broadcast or satellite communication receiving antenna 12 and the satellite broadcast receiving tuner 30 and is arranged in the vicinity of the antenna, and when the signal from the satellite is not received, the primary of the satellite receiving antenna 12 is received. Considering the noise from the converter with radiator 20 as a signal level, the variable resistor 482 of the sensitivity adjusting section 48 is adjusted and the level is set so that the red light emitting diode 46R emits light.

In this state, when the direction of the satellite broadcasting receiving antenna, for example, the azimuth angle is adjusted, the satellite broadcasting signal can be received even by a slight amount, and the red and green light emitting diodes 46R and 46G are turned on. In this state, the variable resistor 482 of the sensitivity adjusting section 48 is adjusted again so that only the red light emitting diode 46R lights up. Then, the direction of the satellite broadcasting receiving antenna 12 is adjusted again so that both the red and green light emitting diodes 46R and 46G are turned on.

Hereinafter, such work is repeated. By repeating such a work, the satellite broadcasting or satellite communication receiving antenna 12 can be finally set to the azimuth angle having the highest reception level, and the elevation angle is similarly set. When the setting is completed, the electric field strength measuring device 10 provided between the satellite broadcasting or satellite communication receiving antenna 12 and the tuner 30 is removed, and the output terminal of the converter 20 of the satellite broadcasting or satellite communication receiving antenna 12 is The construction is completed by directly connecting the coaxial cable from the satellite broadcast receiving tuner 30.

FIG. 4 shows a second embodiment. In this embodiment, the electric field strength measuring device 10a is operated by the operating power supplied from the tuner 30 as in the first embodiment, and is also provided separately as shown by a dotted line in FIG. The operating power is supplied from the external power source 66, and the power can also be supplied to the primary radiator 20 with a converter. Since other configurations are the same as those of the first embodiment, the same parts are designated by the same reference numerals,
The description is omitted.

Electric power from the built-in battery 64 is supplied to the constant voltage power supply unit 52 via the contact 68a of the changeover switch 68, the contactor 68b and the diode 70, where it is converted to a constant voltage, and the amplifier 38, level comparison and It is supplied to the light emitting diode drive unit 42 and the light emitting diode display unit 44. Further, it is supplied from the diode 70 to the input terminal 24 via the high frequency blocking coil 33. Therefore, the built-in battery 64 can also operate the primary radiator 20 with the converter.

The operating power from the external power supply 66 shown in FIG. 2 is supplied to the external power supply terminal 76 shown in FIG. 4, from which it is supplied to the constant voltage power supply section 78 to be converted into a constant voltage, and the changeover switch 68 is provided. Is supplied to the constant voltage power supply unit 52 through the contact point 68c, the contactor 68b, and the diode 70 of
It is supplied to the input terminal 24 via the high frequency blocking coil 33. Therefore, in the same manner as described above, the amplifier 38, the level comparison and light emitting diode drive unit 42, the light emitting diode display unit 44, and the converter-equipped primary radiator 20,
Operating power can be supplied.

When operating power is supplied from the tuner 30 to the output terminal 26, operating power is supplied to the constant voltage power supply unit 52 via the high frequency blocking coil 50 and the diode 79, and the high frequency blocking coil 50 is also supplied. Via the diode 79 and the high frequency blocking coil 33, the input terminal 24
Is also supplied with operating power. Therefore, also in this case, the operating power can be supplied to the amplifier 38, the level comparison and light emitting diode drive unit 42, the light emitting diode display unit 44, and the primary radiator with converter 20. At this time, the contact 68b of the changeover switch 68 has the contact 68
External power from the built-in battery 64 or the external power supply terminal 76 is not supplied to the constant voltage power supply unit 52.

FIG. 5 shows a third embodiment. The electric field intensity measuring device 10a according to this embodiment includes a sensitivity adjusting unit 48 according to the first embodiment, a level comparing and light emitting diode driving unit 42.
The configuration is the same as that of the first or second embodiment except that the resistors 421 and 422 of a are removed and a peak hold circuit 82 is provided instead of the resistors 421 and 422 to automate the sensitivity adjustment.
The same parts are designated by the same reference numerals and the description thereof will be omitted.

The peak hold circuit 82 has a diode 821 whose anode is connected to the output side of the operational amplifier 801 of the DC amplifier 80, and whose cathode is the capacitor 8
22 and resistor 823 are connected to one end of a parallel circuit. The other end of this parallel circuit is grounded.

This parallel circuit is connected to the inverting input terminal of the comparator 42G and the non-inverting input terminal of the comparator 42R of the level comparison and light emitting diode drive section 42. The output of the DC amplification unit 80 is connected to the non-inverting input terminal of the comparator 42G and the inverting input terminal of the comparator 42R. The output side of the comparator 42G is connected to the green light emitting diode 4 via the resistor 44G.
6G, and the output side of the comparator 42R is connected to the red light emitting diode 46R via the resistor 44R.

The peak hold circuit 82 includes a DC amplifier 8
The maximum value of the detected voltage amplified by 0 is always held, and when the detected voltage is higher than this, the comparator 42G causes the green light emitting diode 46G to emit light.
Lights up, and at the same time, the maximum value held in the peak hold circuit 80 also changes to the detection voltage at that time.

Further, the detected voltage is a peak hold circuit 82.
When it becomes smaller than the maximum value held at, the comparator 42R turns on the red light emitting diode 46R. At this time, the charge of the capacitor 822 gradually decreases due to the time constant determined by the capacitance of the capacitor 822 and the resistance value of the resistor 823.

Therefore, when the satellite broadcasting or satellite communication receiving antenna is adjusted by using the electric field strength measuring device 10a, the satellite broadcasting or satellite communication receiving antenna 12 is set in the same manner as shown in FIG. The electric field measuring device 10a is set approximately in the direction of the satellite, and the electric field measuring device 10a is connected between the satellite broadcast or satellite communication receiving antenna 12 and the satellite broadcast receiving tuner 30 and is arranged in the vicinity of the antenna 12.

In this state, if the signal from the satellite is not received, the satellite broadcasting or satellite communication receiving antenna 1
The noise from the converter 20 with the primary radiator No. 2 is held in the peak hold circuit 82. Here, when the direction of the antenna 12, for example, the elevation angle is adjusted and the satellite broadcast signal can be received even slightly, the green light emitting diode 46G is turned on.

When the direction is further adjusted and the reception level increases, the green light emitting diode 46G continues to light up, and the detection voltage held in the peak hold circuit 82 also increases.

After a while, the red light emitting diode 46R is turned on when the adjustment is made to the direction of the maximum reception level, and when the adjustment is made beyond this direction to the direction where the reception level becomes smaller than the maximum reception level. As a result, it is known that the reception level is out of the maximum reception level, so that the direction of the antenna 12 is returned to its original position and readjustment is performed so that the green light emitting diode 46G is turned on.

By adjusting in this way, the satellite broadcasting or satellite communication receiving antenna 12 can be set to the azimuth angle having the highest reception level. Similarly, the elevation angle is set, and when the setting is completed, the electric field strength measuring device 10a provided between the satellite broadcasting or satellite communication receiving antenna 12 and the tuner 30 is removed, and the output terminal of the converter 20 of the antenna 12 is removed. Then, the coaxial cable line from the tuner 30 is directly connected to complete the construction.

In each of the above-mentioned embodiments, the light emitting diode is used, but instead of this, another light emitting element such as a light bulb may be used. In the above embodiment, the light emitting diodes of two colors of red and green are used so that the state of the reception level can be clearly understood. However, which light emitting diode is received in the first embodiment depends on the arrangement position and the like. If it is clearly understood whether the light is emitted when the level is low and the light is emitted when the reception level is high in the second embodiment, it is not always necessary to color-code.

[0037]

As described above, according to the first aspect of the present invention,
Since it is possible to adjust the values of the first and second reference signals in conjunction with each other, it is possible to adjust the antenna to the transmission source by using the electric field intensity measuring device according to the present invention with only two light emitting elements. It can be easily adjusted to the maximum reception level.

Further, according to the second aspect of the invention, since the peak hold signal of the detection output is used as the reference signal, only two light emitting elements are used in the same manner as in the first aspect of the invention. By using the electric field strength measuring device, the antenna can be easily adjusted to the maximum reception level with respect to the transmission source, and the work of adjusting the reference signal is completely unnecessary, so that workability is improved.

[Brief description of drawings]

FIG. 1 is a detailed block diagram of an essential part of a first embodiment of an electric field intensity measuring device according to the present invention.

FIG. 2 is a diagram showing a usage state of the first embodiment.

FIG. 3 is an overall block diagram of the same first embodiment.

FIG. 4 is an overall block diagram of the second embodiment.

FIG. 5 is a block diagram of an essential part of the third embodiment.

[Explanation of symbols]

 40 Detection Unit (Detection Means) 42R Comparator (First Comparison Means) 42G Comparator (Second Comparison Means) 46R Light Emitting Diode (First Light Emitting Element) 46G Light Emitting Diode (Second Light Emitting Element) 48 Sensitivity Adjusting Section ( Reference signal generating means) 82 Peak hold circuit (peak hold means)

Claims (2)

[Claims] 1. A detection means for detecting a received signal, first and second comparison means to which a detection output from the detection means is supplied, and a first reference signal supplied to the first comparison means. 1
Based on the output of the first comparing means when the detected output is larger than the first reference signal, and the reference signal generating means for supplying the second comparing means with the second reference signals larger than the reference signal respectively. And a second light emitting element which is turned on based on the output of the second comparing means when the detected output is larger than the second reference signal. The means is an electric field intensity measuring device configured so that the values of the first and second reference signals can be changed in conjunction with each other. 2. A detection means for detecting a received signal, a first comparison means for generating a comparison output when a detection output from the detection means is smaller than a reference signal, and the detection output is higher than the reference signal. The second comparison means for generating a large comparison output and the detection signal of the detection means are input and the output signal is set to the first
And a peak hold means for supplying the second comparison means as the reference signal, a first light emitting element which is turned on based on the comparison output of the first comparison means, and a lighting based on the comparison output of the second comparison means. And a second light-emitting element for measuring the electric field strength.