JPH01114107A - Antenna for receiving reception level display type satellite broadcast - Google Patents

Abstract

PURPOSE:To facilitate an angle adjustment of an antenna by providing a 1st down-converting converting a reception signal from an antenna main body into a low frequency and outputting the result, a branch means, a 2nd down- converter and a level indicator. CONSTITUTION:A reception signal outputted from a planer antenna 1 is given to the 1st down-converter 2, amplified, and subjected to frequency selection and conversion to a prescribed frequency, and the result is branched by a branch device 5. The one branched reception signal is outputted to an output terminal 60 and the other reception signal is given to the 2nd down-converter 3 together with a DC current supplied from the output terminal 60 and given to the level indicator 4 via a power supply circuit 30, a frequency conversion circuit 31 and a level detection circuit 33, etc., where the display in response to the reception level is applied. Thus, the deviation of the angle is easily corrected by having only to adjust antenna angle in a way of maximizing the display level while observing the display plane 40 of the indicator 4 thereby easily adjusting the angle of the antenna.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a reception level display type satellite broadcast receiving antenna that is provided with a circuit for detecting and displaying the reception level.

[Background technology J Satellite broadcasting that uses satellites as repeaters receives broadcast radio waves transmitted from geostationary satellites in the distant sky, so the strength of the received radio waves on the ground is compared to the strength at the time of transmission. 1120
It becomes below dBm+. Therefore, receiving antennas are required to have high sensitivity, but such high-gain antennas have sharp directivity, and in satellite broadcast receiving antennas, the half-value angle is about ±1° to ±3°. . For this reason, the antenna
To ensure that the antenna surface points in the direction of the broadcasting satellite, delicate adjustments to the azimuth and elevation angles are required.

Satellite broadcasting generally has a configuration as shown in FIG. Image and audio signals are input to the television receiver 14. Adjustment of the antenna angle can be carried out by adjusting the angle of the antenna 10 while checking the reception status of the TV reception 8! 1
6 is provided on the tuner 13 and this measurement terminal 16
There is a method of adjusting the angle of the antenna 10 so that the maximum voltage value is obtained by connecting a measuring device such as a voltmeter 15 to the DC voltage and measuring the DC voltage.

As another method, as shown in FIG. 4, there is a device in which a parabolic antenna main body 71 having a built-in converter 72 and installed outdoors is connected to a chew 80 installed indoors by a transmission cable 78. There are some that use The tuner 80 is configured to superimpose a pulse-modulated AC signal on the drive current to the converter 72 according to the level of the input received signal and output it to the antenna side. It is separated and output to terminal 74. This device connects an AC voltmeter 90 to this terminal 74 and measures the voltage of the AC signal according to the reception level, thereby adjusting the azimuth and elevation angle of the antenna so that the voltage value becomes the maximum value. It has become.

The traditional adjustment method as mentioned above, like the first method,
A television receiver 14 is required near the installation position of the antenna 10, a tuner with a measurement terminal 16 for measurement is required near the antenna 10 as in the second method, and the final When adjusting the antenna angle, equipment and measurement devices that are actually used for measurement are required, such as the need for the level measurement device described in .

Further, in general, the television reception fi 14, tuner 13, and tuner 80 require an AC power source of 100V. As described above, in the conventional art, there is a problem in that the adjustment work of the antenna angle cannot be performed only with the antenna, and is not easy.

[Object of the Invention] The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a reception level display type satellite broadcasting antenna that facilitates the angle adjustment work of the antenna. .

[Disclosure 1 of the Invention The reception level display type satellite broadcast receiving antenna of the present invention includes:
An antenna body for satellite broadcast reception, a first down converter that converts the received signal from the antenna body to a low frequency and outputs it, and branches the output of the first down converter and outputs one to the chase side. a second down converter that uses the frequency conversion circuit and the level detection circuit to output a display signal according to the level of the received signal using the other output of the branching means; Consists of a level display meter that displays according to the display signal,
Since the first down converter, the second down converter, the branching means, and the level indicator are housed in a case integrated with the antenna body, and the display surface of the level indicator is exposed outside the case, the angle of the antenna can be adjusted. 1I11! The reception level required for M can be read by a display meter integrated with the antenna, making it easier to adjust the angle of the antenna.

East ifL FIG. 1 shows a configuration diagram of an embodiment of the present invention. The antenna of this embodiment includes a parabolic antenna or a flat antenna 1 as an antenna body for receiving satellite broadcasting, and a receiving signal from the flat antenna 1. A first down converter 2 that converts to a predetermined frequency and outputs it, a branch 5 as a branching means that branches the output of the first down converter 2 and outputs one to an indoor device such as a tuner, and a branch a second down converter 3 which inputs the other output of the second down converter 5 and outputs a display signal according to the level of this received signal; and a level display meter 4 which performs a display according to the display signal of the second down converter 3. It consists of As shown in FIG. 2, the planar antenna 1 has a three-layer structure in which a radiation circuit board 1a provided with a protective layer from the antenna surface side, a feeding circuit board 1b, and a grounding board 1c are arranged in this order at a predetermined distance apart. It becomes. The air layer between the boards provided by the separation is a dielectric material, so this three-layer structure has a suspended structure,
Alternatively, spacers are attached to each position of the substrates 1a, lb, and lc so as not to increase the loss of the strip line. The received radio wave received by the planar antenna 1 is output as a received signal to the first down converter 2 via a connector (not shown) attached to a feeding point P at a predetermined position on the feeding circuit. Each circuit such as the first and second down converters 2 and 3, the level indicator and the switch 5 is housed in a metal or resin case 6, and this case 6 is integrally attached to the planar antenna 1. has been done. The level indicator 4 is provided with its display surface 40 exposed at an easily visible position outside the case 6. The first down converter 2 includes a planar antenna 1
Amplification circuit 21 for amplifying the received signal as it is
, a filter 22 for selecting a signal of a predetermined frequency from the amplified received signal, and one selected by the filter 22.
It is comprised of a frequency conversion circuit 23 that converts the frequency of a 2GH2 band received signal to 1.3GHz to reduce loss in the transmission cable, and an amplifier circuit 24 that further amplifies the received signal. The filter 22 also suppresses unnecessary radiation of the local oscillator from the frequency conversion circuit 23 at the next stage.The zero brancher 5 outputs its branch line side to the second down converter 3. At the same time, the main line side is connected to an output terminal 60 attached to the case 6. The splitter 5 may alternatively be a distributor.

By the way, the transmission cable for connecting the planar antenna 1 to the tuner is connected to the output terminal 60 and the received signal input terminal of the chase, and not only transmits the received signal to the tuner side, but also transmits the received signal to the tuner side. In order to drive the active circuits of the first and second down converters 2 and 3 on the antenna side, the DC current from the DC power supply built in the tuner is superimposed and transmitted and supplied to the antenna side. It has become. Here, the branch 5 is configured such that this DC current inputted from the output terminal 60 side of the branch 5 passes only to the second down converter 3 side, and the DC current is branched at the branch 5. The received signal is input to the second down converter 3 together with the received signal. There is no need to supply direct current because it is a chase, and a portable direct current power supply is connected to the output terminal 6 of the antenna.
0 to drive each circuit.

The second down converter 3 inputs the other output of the branching circuit 5 and then divides the input. In other words, the second down converter 3 inputs one of the divided outputs and also outputs the superimposed DC current. A power supply circuit 30 for supplying a predetermined power to each circuit of the first and second down converters 2 and 3 upon extraction, and a frequency conversion circuit 31 for inputting the other, converting the frequency to a lower frequency and outputting it. , frequency conversion circuit 3
1 to a predetermined level, and a level detection circuit 33 that converts the output of the amplifier circuit 32 into a DC voltage to a level suitable for the operating range of the level indicator 4 and outputs it as a display signal. Ru. The degree of amplification of the amplifier circuit 32 is determined so that changes in the received signal are reflected in the output after DC voltage conversion of the level detection circuit 33 at the next stage, and the change in the received level can be easily recognized by the display by the level indicator 4. It will be done.

The level indicator 4 may be of either an analog type or a digital type.

The operation of the antenna of this embodiment will be explained below.

When installing the antenna, if you carry the antenna of this example and a DC power supply for driving the circuit of the antenna, or a transmission cable to connect the antenna and the tuner to obtain DC power from the tuner. good. That is, only a predetermined direct current is required to adjust the angle of the antenna. In addition, the circuit necessary to measure and display the reception level is installed in the case 6, which is integrated with the antenna, so there is no need to carry any measuring equipment, and you can connect a DC power supply or transmission cable to the output terminal. 60, a predetermined DC current is supplied to the open circuit of the antenna via the brancher 5 and the power supply circuit 30 of the second down converter 3, and each circuit operates. That is, the received signal output from the planar antenna 1 is input to the first down converter 2, where it is amplified, frequency selected, and converted to a predetermined frequency, further amplified, and then branched at the splitter 5.

One branched received signal is output to the output terminal 60 side, and the other received signal is inputted to the second down converter 3 together with the DC current supplied from the output terminal 60. In the power supply circuit 30, only direct current is taken out. The frequency conversion circuit 31 extracts only the received signal, converts the frequency to a lower frequency, amplifies it, converts it to DC, and then inputs it as a display signal to the level display meter 33, where it is displayed according to the received level. . That is, as the antenna surface moves away from the geostationary satellite, the display level decreases, and as the antenna surface approaches the geostationary satellite (direction), the display level increases. All you need to do is adjust the antenna angle so that the displayed level is maximized while looking at the display screen 40 of the level indicator 4.Furthermore, even after installation, if you look at the level display of the antenna during use, If the angle of the antenna deviates from the level at the time of installation, the level will drop compared to the level at the time of installation adjustment, so the angular deviation can be easily detected.

As described in this embodiment, the antenna of the present invention not only requires a DC power source for the antenna circuit, but also has a level display that corresponds to the reception level integrated into the antenna. , without the need for any measuring equipment, as long as you have the specified DC power supply, without the need for a tuner or television receiver, and without the need for 100cm AC as a power source for these devices. The angle of the antenna can be adjusted.

[Effect of the invention 1 The reception level display type satellite broadcast receiving antenna of the present invention has the following features:
An antenna body for satellite broadcast reception, a first down converter that converts the received signal from the antenna body to a low frequency and outputs it, and branches the output of the first down converter and outputs one to the chase side. a second down converter comprising a frequency conversion circuit and a level detection circuit and outputting a display signal according to the level of the received signal by the other output of the branching means; and the display of the second converter. Consists of a level display meter that displays according to the signal,
Since the first down converter, the second down converter, the branching means, and the level indicator are housed in a case integrated with the antenna body, and the display surface of the level indicator is exposed outside the case, the angle of the antenna can be adjusted. The reception level required for adjustment is displayed by a display meter integrated with the antenna, which has the effect of facilitating the work of adjusting the antenna angle lIIg.

[Brief explanation of the drawing]

FIG. 1 is a circuit configuration diagram of an embodiment of the present invention, FIG. 2 is a cross-sectional view of the same planar antenna, and FIG. 3 is a conventional antenna angle ll! FIG. 4 is a circuit configuration diagram showing another method of adjustment, in which 1 is a planar antenna, 2 is a first down converter, 3 is a second down converter, and 4 is a level Display meter, 5 is a turnout as a branching means, 6
is a case, 30 is a power supply circuit, 31 is a frequency conversion circuit, 3
3 is a level detection circuit.

Claims (1)

[Claims] (1) An antenna body for satellite broadcast reception, a first down converter that converts the received signal from the antenna body to a low frequency and outputs it, and branches the output of the first down converter and sends one to the tuner side. a second down converter that includes a frequency conversion circuit and a level detection circuit and outputs a display signal according to the level of the received signal by the other output of the branching means; The first down converter, the second down converter, the branching means, and the level display meter are housed in a case integrated with the antenna body, and the level display meter displays information according to the display signal. A reception level display type satellite broadcast receiving antenna characterized by having a display surface exposed outside the case.