JPS609202A - Reception level meter for adjusting reception antenna direction - Google Patents

Abstract

PURPOSE:To eliminate the use of another power supply for a reception power meter by using a double branching device having terminals all conducting in terms of DC and supplying the power to the reception power meter via said double branching device. CONSTITUTION:A double branching device 201 is set between an output terminal 103 of a frequency converter 102 and a connection cable 104. Three terminals of the device 201 all conduct in terms of DC at the sides of the converter 102, an indoor unit 105 and a reception power meter 202 respectively. Therefore the DC power supplied to the converter 102 from the unit 105 via a cable 104 is also impressed to an antenna input terminal of the meter 202 by the device 201. In such a constitution, it is not needed to use a commercial power supply or a battery power supply for the meter 202.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for adjusting the pointing direction of a receiving antenna of a satellite broadcast receiving device or the like.

FIG. 1 shows the configuration of a satellite broadcast receiver. The receiving antenna 101 and the frequency converter 102 are installed outdoors,
The radio waves from the broadcasting satellite are received by the receiving antenna lO1,
The frequency is converted by a frequency converter 102 directly connected to this antenna.

This frequency-converted signal is sent to the indoor device via a connection cable 104, and is sent to the indoor unit 10, which includes a cheese section, a demodulation section, etc.
5 to the desired broadcast channel signal to the television receiver 1
Output to 06. Further, the power for the frequency converter is supplied in a manner superimposed on the connection cable.

Now, in the case of satellite broadcasting, the frequency band of broadcast waves is 12GH2
For example, when using a parabolic antenna, the antenna diameter is about 1 m, so
The half power width of the receiving antenna is about 2 degrees. In order to obtain good reception conditions, it is necessary to accurately point a receiving antenna with such a sharp directivity in the direction of the broadcasting satellite.

To this end, after installing the receiving antenna to be actually used, the elevation angle and horizontal angle are adjusted, the receiving state at the receiving antenna is monitored, and the direction is fixed in a direction where the maximum reception level can be obtained.

Reception status monitoring can be performed using conventional VHF and UHF
When installing a broadcast receiving antenna, in ordinary homes, the optimum direction is determined by adjusting the direction of the receiving antenna while monitoring the screen condition of the television receiver.

However, in the case of satellite broadcast receiving antennas, as mentioned above, they have sharp directivity, and if the beam direction is slightly different, the reception level will drop sharply, so it is impossible to determine the antenna direction using the method described above. Very difficult. In such a case, a reception level meter is connected to the reception antenna, and the direction of the antenna is adjusted while monitoring the indication of the reception level meter so as to obtain the maximum reception level. At this time, the direction adjustment is naturally performed on the roof or on the rooftop, and a power source for the reception level meter is often not nearby.

The present invention provides a power source for a reception level meter for adjusting the direction of a satellite broadcast receiving antenna without having to connect a power cord from indoors, for example, and without using an external power source such as a battery or a built-in power source. It is provided without any restrictions.

As mentioned above, the power for the frequency converter connected to the receiving antenna is supplied superimposed on the connection cable with the indoor unit.

FIG. 2 shows a configuration example for adjusting the receiving antenna direction using the present invention, in which a two-brancher 201 is inserted between the connecting cable 104 connected to the output terminal 103 of the frequency converter 102. The amount of coupling of this two-brancher to the branch terminal may be such that a part of the output power of the frequency converter can be branched and the reception level can be monitored by the reception power meter 202 connected to the branch terminal. Not specified. The two-way splitter 20
A total of eight terminals on the frequency converter side of No. 1 and on the receiving power meter side of the indoor unit are all DC-conducted. Therefore, the DC power supplied from the indoor unit 105 to the frequency converter 102 via the connection cable 104 is
The splitter also applies the power to the antenna input terminal of the receiving power meter 202.

FIG. 3 shows an example of a general configuration of a receiving power meter. The signal input from the antenna input terminal 300 is 301°302,
, 303 after being tuned, amplified and filtered at 303
4, and the input power amount is shown on the display 305. Power is supplied to these circuits by a power source 306 such as a commercial power source or a built-in battery.

FIG. 4 shows an example of the configuration of the receiving level meter of the present invention, in which a splitter 401 is connected between the antenna input terminal 300 and the cheese 301.
is inserted, the high frequency signal component is connected to the tuner 301 by the splitter, and the DC superimposed power source is connected to the power source 40.
2. Therefore, the receiving power meter is operated by the DC power applied to the antenna input terminal.

When the receiving power meter and the aforementioned two-way splitter are connected as shown in Figure 2, the power source for the receiving level meter for adjusting the antenna direction is connected to the connection cable and the two-way splitter in the same way as the frequency converter. There is no need to use a separate commercial power source, and there is no need to have a DC stabilized power source or battery power source inside the receiving level meter.

This allows the receiving level meter to be made smaller and brighter.

Also, since satellite broadcast receiving antennas have sharp directivity as mentioned above, the installation of the antenna is a little complicated because the direction adjustment needs to be done for both elevation and horizontal angles. It is.

Since the broadcasting satellite is in a geostationary orbit, once the receiving antenna installation position is determined, the required elevation angle is determined.

Therefore, first find this required elevation angle by some method, adjust the elevation angle of the receiving antenna, and then rotate the receiving antenna in the horizontal direction to easily receive the broadcast waves from the satellite in one turn. One way is to fine-tune the horizontal angle.

For this purpose, a means for knowing the required elevation angle depending on the installation position of the receiving antenna is required.

This may be, for example, a map on which iso-elevation angle lines are drawn, connecting locations on the map with equal required elevation angles.

In this case, after the required elevation angle is known, it is necessary to detect the elevation angle of the receiving antenna when adjusting the receiving antenna to that angle.

Next, an example will be shown in which this angle of elevation is made easier to detect.

FIG. 5 shows an embodiment in which a reception antenna elevation angle detection and display device is added to the two-brancher of the reception level meter of the present invention, and connectors 501 and 502 are connectors connected to the connection cable from the frequency converter and the indoor unit. It is. connector 50
3 is a connector for connection to a reception level meter. The elevation angle detection and display device 504 includes, for example, an elevation angle display panel 505 and a pointer 506 that indicates the vertical direction using a weight or the like. The directivity direction of the receiving antenna and the axial direction (fifth
Since the angle formed by A-A') in the figure is known, the angle display scale of the elevation angle display panel is scaled according to this angle so that the elevation angle of the antenna pointing direction can be read on the elevation angle display device. I'll keep it.

By attaching such a two-brancher to a frequency converter, the elevation angle of the receiving antenna can be easily determined, and the directivity direction of the receiving antenna can be adjusted very easily. In the case of an elevation angle detection display device that uses a weight, the bifurcating switch should be set so that the plane on which the weight swings includes the vertical line so that the weight does not come into contact with the walls inside the storage case and the pointer accurately indicates the vertical direction. For example, a spirit level or the like is added to the two-branch divider so that it can be connected and fixed to the output terminal of the frequency converter, so that the direction that should be set so that the plane in which the weight swings faces a predetermined direction angle can be detected and displayed. do it.

FIG. 6 is an example in which a power supply terminal 604 is attached to a two-brancher inserted between the connection cable connecting the output terminal of the frequency converter and the indoor unit. The terminal to which the frequency converter output terminal and connection cable terminal are connected is 601.
and 602. Terminal 603 is a branch output terminal for the frequency converter output signal, and is connected to a capacitor 60 for DC cut.
5 is inserted into the line to prevent superimposed DC power from flowing in from the antenna input terminal of the receiving power meter connected to it.

The terminal 604 is a terminal for taking out the power, and in terms of high frequency,
It is open, and the power for the receiving power meter is taken out from this terminal. With such a splitter, there is no need to divide signal power and power supply power within the receiving power meter.

By utilizing the present invention described above, there is an effect that there is no need to draw a commercial power source as a power source for a receiving power meter or to have a built-in power source.

[Brief explanation of drawings]

Figure 1 shows the configuration of a satellite broadcasting receiver, and Figure 2 shows the configuration when level adjustment is performed using the reception level meter of the present invention.
Fig. 3 shows a configuration diagram of a receiving power meter, Fig. 4 shows an example of the structure of a receiving level meter of the present invention, and Fig. 5 shows an elevation angle display panel for antenna direction adjustment on a two-way splitter used in the present invention. FIG. 6 shows another embodiment of the two-way splitter used in the present invention. In the figure, 101 is a receiving antenna, 102 is a frequency converter 10
3 is an output terminal, 104 is a connection cable, 105 is an indoor unit, 106 is a television receiver, 201 is a 2-way branch, 2
02 is a power meter, 300 is an antenna input terminal, 301 is a cheese, 302 is an amplifier circuit, 303 is a filter, 3
04 is a detection circuit, 305 is a display, 401 is a splinter, 402 is a power source, 501, 502, and 508 are connectors, and 504 is an elevation angle detection display device.

Claims (1)

[Claims] (1) Connecting the output terminal of a frequency converter that is connected to the receiving antenna feed end or integrated with the primary radiator of the receiving antenna, and the frequency converter and indoor equipment to supply power to the frequency converter. It consists of a two-brancher inserted between the two-brancher and the superimposed connection cable, and a reception power meter that is connected to the other branch output terminal of the two-brancher and measures the output signal power of the frequency converter. and each terminal of the two-way splitter is also DC-conducting, and power is supplied to the reception power meter via the two-way splitter. Total.