JP2003008460A - Switching distributor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a switching distributor that can alternatively select received signals of a plurality of systems, provide an output of the selected signal from a single output terminal section and reduce signal intrusion between signal transmission lines. SOLUTION: Input terminal sections 3a to 3d receiving 4-system of received signals and 4 output terminal sections 7a to 7d connected to a reception terminal are placed in a metal-made case. The signals received from each system given to the input terminal sections 3a to 3d are respectively distributed into four, and the output terminal sections 7a to 7d selectively output the received signal of each system. Further, a metal-made shield plate 13 covers an amplifier circuit section 4, and at least one screw hole to which a screw 8 electrically connecting the shield plate 13 to the case is screwed is provided to an outer face of the case.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switching distributor for distributing received signals of a plurality of systems from an antenna to a plurality of receiving terminals and selecting and receiving a received signal of a desired system at each receiving terminal. Is.

[0002]

2. Description of the Related Art Conventionally, a technique for transmitting different information using two types of polarized waves which are orthogonal to each other, such as vertically polarized waves and horizontally polarized waves, or right-handed circularly polarized waves and left-handed circularly polarized waves, has been used in satellites. It is known in the communication field to be used. For example, a communication satellite used for satellite broadcasting uses vertical polarization and horizontal polarization. A satellite receiving antenna (so-called CS antenna) that receives the transmitted radio waves receives a vertically polarized signal and a horizontally polarized signal from each communication satellite,
Each polarization signal is converted into a reception signal in a predetermined frequency band and output.

Therefore, when a receiving terminal for receiving each received signal from the CS antenna is used and each received signal is transmitted from one CS antenna to the receiving terminal via a cable,
One cable is connected to each of the output terminal portions corresponding to the vertically polarized wave and the horizontally polarized wave of the CS antenna, and a total of two cables are wired to the receiving terminal. Also, if you try to listen together with multiple receiving terminals,
It is necessary to provide a distributor between each of the two terminals drawn from one CS antenna and each receiving terminal to distribute each received signal from the CS antenna to each receiving terminal.
The same applies to BS broadcasting using right-handed circular polarization and left-handed circular polarization.

[0004]

As is apparent from the above description, in order to use the CS broadcasting service of a plurality of systems in a plurality of rooms, it is necessary to extract a received signal for each room in which each receiving terminal is installed. A plurality of outlets are required respectively. Therefore, it is necessary not only to connect the distributor and the CS antenna but also to connect the distributor and each outlet with a cable, which makes the indoor wiring work extremely troublesome.

Further, a CS tuner is generally provided in front of the receiving terminal in order to receive a reception signal from a communication satellite. The CS tuner receives the reception signals of a plurality of systems as they are from each CS antenna as a whole, Since it does not have a function of selectively selecting the system of the received signal and outputting it to the receiving terminal side, it is necessary to separately provide a switcher for switching the system of the received signal input to the CS tuner.

The present invention has been made in view of the above circumstances, and an object of the present invention is to selectively receive signals from a plurality of systems so that the signals can be output from one output terminal section.
It is an object of the present invention to provide a switching distributor that facilitates indoor wiring work and does not need to provide a switching device separately from the distributor and can reduce signal boarding between signal transmission lines inside the device.

[0007]

In order to solve the above-mentioned problems, a switching distributor according to a first aspect of the present invention includes a plurality of input terminal portions to which received signals of a plurality of systems are respectively inputted and a radio wave from a satellite. A plurality of output terminal parts to which a plurality of receiving terminals for reception processing are respectively connected, a plurality of amplifier circuits for amplifying the received signals from the respective input terminal parts, and the received signals amplified by the respective amplifier circuits. A plurality of distribution circuits for distributing each and a plurality of switching circuits for selecting the output of one distribution circuit from all the distribution circuits according to an instruction from the receiving terminal are provided in one metal casing. , The amplification circuit is covered with a shield made of metal, and at least one screw hole into which a screw electrically connecting the shield and the casing is screwed is provided on an outer surface of the casing. thing A.

According to a second aspect of the present invention, there is provided the switching distributor according to the first aspect, wherein the casing is mounted so as to abut against a construction surface, and the casing has a surface abutting against the construction surface. Is provided with a plurality of screw holes into which screws for electrically connecting the shield and the housing are screwed, and the screws can be freely attached and detached in the corresponding screw holes. It is a thing.

According to a third aspect of the present invention, there is provided the switching distributor according to the first or second aspect, wherein the casing is attached so as to abut a construction surface, and the input terminal portion and the output terminal portion are attached. And a circuit board provided to face the construction surface and connected to each other, and a surface of the shield that connects the circuit board and a surface of the shield that is orthogonal to the circuit board. Is formed of a metal elastic body.

According to a fourth aspect of the present invention, there is provided the switching distributor according to the first to third aspects, wherein the casing is attached so as to abut a construction surface, and the input terminal portion and the output terminal portion are attached. Each of which is connected to each other and is provided so as to face the construction surface, and a screw for electrically connecting the ground pattern of the circuit board and the housing is screwed onto the outer surface of the housing. It is characterized in that at least one screw hole is provided.

A switching distributor according to a fifth aspect is the switching distributor according to the fourth aspect, in which the ground pattern of the circuit board and the ground pattern are formed on a surface of the housing that is opposite to a surface in contact with a construction surface. It is characterized in that a plurality of screw holes into which screws for electrically connecting to the housing are screwed are provided, and the screws are freely attached and detached in the corresponding screw holes.

A switching distributor according to a sixth aspect is the switching distributor according to any one of the first to fifth aspects, wherein a metal plate is slidable in a space between the amplification circuit and the shield. It is characterized by being configured.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, the present embodiment exemplifies a case where two CS antennas 1a and 1b are used. The CS antennas 1a and 1b respectively receive radio waves from different communication satellites. CS antenna 1a
In both cases, when a DC voltage of DC 11V is supplied, the vertically polarized signal is converted into a reception signal of a predetermined frequency band (hereinafter referred to as reception signal (vertical 1)) and output, and a DC voltage of DC 15V is supplied. And the horizontal polarization signal are converted into a reception signal in a predetermined frequency band (called a reception signal (horizontal 1)) and output. On the other hand, when the DC voltage of DC 11V is supplied, the CS antenna 1b converts the vertically polarized signal into a reception signal of a predetermined frequency band (hereinafter, referred to as reception signal (vertical 2)) and outputs it, and DC 15V is supplied. Then, the horizontally polarized signal is converted into a reception signal in a predetermined frequency band (hereinafter, referred to as reception signal (horizontal 2)) and output.

A CS antenna 1a and a CS antenna 1b are connected to the switching distributor 20 of this embodiment via a coaxial cable D1. Further, the switching distributor 20 is connected via a coaxial cable D2 to a TV outlet serving as one outlet 2b, and each outlet 2b is connected to a CS tuner 2a via a coaxial cable D3. Also,
A television receiver 2 as a receiving terminal is connected to the latter stage of the CS tuner 2a.

As shown in FIG. 2, the switching distributor 20 of this embodiment has four input terminal portions 3 each of which is an F-connector.
a to 3d and output terminal portions 7a to 7d. The input terminal portions 3a and 3b are connected to the CS antenna 1a and the coaxial cable D1.
The input terminal portions 3c and 3d are connected to the CS antenna 1b via the coaxial cable D1. The input terminals of the amplifier circuit section 4 are connected to the respective input terminal sections 3a to 3d. A shield plate 13 made of a metal conductor for reducing the aerial radiation of the amplified received signal is attached to each amplifier circuit portion 4 so as to cover each amplifier circuit portion 4, and the circuit board is soldered. It is connected to a ground pattern 31 (hatched portion in FIG. 2) provided on 30. Further, the output terminal of each amplification circuit section 4 is connected to a two-distribution circuit section 5a that divides the input signal into two, and the output signal of each two-distribution circuit section 5a is divided into two. 2 distribution circuit units 5b and 5c are connected to each other. Therefore, the reception signal (vertical 1), the reception signal (horizontal 1), the reception signal (vertical 2), and the reception signal (horizontal 2), which are input to the input terminal portions 3a to 3d, are divided into two distribution circuit portions. 4 will be distributed by each of 5a to 5c. By the way, the switching circuit section 6 is connected to each of the output terminal sections 7a to 7d. Each switching circuit section 6
Are connected to the two-distribution circuit units 5b and 5c so as to selectively select the reception signals of four systems. That is, the output of the two-distribution circuit section 5b is selected by the switching circuit section 6 corresponding to the output terminal sections 7a and 7b, and the output of the two-distribution circuit section 5c is selected by the switching circuit section 6 corresponding to the output terminal sections 7c and 7d. To be done.

As shown in FIG. 3, the amplifier circuit section 4 has the CS antennas 1a and 1b input from the input end 40.
The amplifier A1 for amplifying the received signal from the
1 is connected between the input terminal 40 and the input terminal 40, and a capacitor C2 is connected between the amplifier A1 and the output terminal 41.
Are connected. A series circuit of two coils L1 and L2 is inserted between the input end 40 and the output end 41. At the output end 41, the CS antennas 1a and 1b and the amplifier A1
Is supplied to the amplifier A1 from the connection point of the coils L1 and L2. Also, the coil L1,
The L2 allows a direct current to pass from the output end 41 to the input end 40, and blocks the reception signals from the CS antennas 1a and 1b. On the other hand, the capacitors C1 and C2 are connected to the input terminal 40
While passing the received signal from the output terminal 41 and blocking the reverse flow of the direct current from the output terminal 41.

Each of the two distribution circuit units 5a to 5c has the same structure, and as shown in FIG. 4, the received signal from the input end 50 is distributed to the output ends 51a and 51b using the transformer TR1 and the autotransformer TR2. . Also, the output terminals 51a, 5
A direct current can be passed from 1b to the input end 50. One end of the auto transformer TR2 is grounded via the capacitor C3.

The switching circuit section 6 is composed of a switch for selectively selecting from a vertically polarized signal and a horizontally polarized signal from the CS antenna 1a and a vertically polarized signal and a horizontally polarized signal from the CS antenna 1b, respectively. Output terminal parts 7a to 7d
It is connected to the.

The operation of the switching distributor 20 of this embodiment will be described below. When the receiving terminal receives the received signal (vertical 1) from the CS antenna 1a, the CS tuner 2a
Is supplied to the switching distributor 20 via the coaxial cables D2 and D3, and the switching circuit unit 6 selects the contact connected to the input terminal unit 3a. At this time, 2
A direct current voltage of DC 11V is supplied to the CS antenna 1a via the coaxial cable D1 through a path that passes through the distribution circuit unit 5b, the amplifier circuit 4, and the input terminal unit 3a. Also, the receiving terminal is C
When receiving the reception signal (horizontal 1) from the S antenna 1a, a DC voltage of DC15V is supplied to the switching distributor 20 via the coaxial cable D2, and the switching circuit unit 6 receives the DC voltage and receives the input voltage. Select the contact connected to part 3b. Also in this case, the DC voltage of DC15V is supplied to the CS antenna 1a via the coaxial cable D1. When the receiving terminal receives the reception signal (vertical 2) from the CS antenna 1b, a DC voltage of DC 11V superposed with a satellite selection control signal of 32 to 53 kHz for distinguishing the CS antenna 1a and the CS antenna 1b. Is supplied to the switching distributor 20 via the coaxial cable D2, and the switching circuit section 6 receives the satellite selection control signal and the DC voltage of DC 11V and selects the contact point connected to the input terminal section 3c. Where D
The DC voltage of C11V is supplied to the CS antenna 1b via the coaxial cable D1. The receiving terminal is the CS antenna 1b
When receiving the reception signal (horizontal 2) from the satellite, the DC voltage of DC15V on which the satellite selection control signal is superposed is supplied to the switching distributor 20 via the coaxial cable D2, and the switching circuit unit 6 is connected to the satellite. Upon receiving the selection control signal and the DC voltage of DC15V, the contact connected to the input terminal portion 3d is selected. Also in this case, the DC voltage of DC15V is supplied to the CS antenna 1b via the coaxial cable D1.

For example, on the CS tuner 2a side connected to the output terminal portion 7a and the output terminal portion 7b, CS
When receiving a reception signal (vertical 1) from the antenna 1a, a DC voltage of DC 11V is supplied from each CS tuner 2a to the output terminal unit 7a and the switching circuit unit 6 via the coaxial cables D2 and D3, and the switching circuit Part 6 senses the DC voltage of DC 11V and detects the DC voltage of 11V, and the leftmost side of the switch (in FIG. 2).
Close. The DC voltage of DC 11V is supplied to the 2-distribution circuit unit 5 and the amplification circuit unit 4 via the signal line, and then supplied from the input terminal unit 3a to the CS receiving antenna 1a via the coaxial cable D1. And the received signal (vertical 1)
Is output from the CS receiving antenna 1a to the input terminal portion 3a via the coaxial cable D1. Received signal (vertical 1)
Is amplified by the amplifier circuit section 4 from the input terminal section 3a and output to the two-distribution circuit section 5a. The received signal (vertical 1) is output from the two-distribution circuit unit 5a to the two-distribution circuit unit 5b. The received signal (vertical 1) is divided into two by the two-division circuit section 5b and output to each switching circuit section 6. The received signal (vertical 1) is output from each switching circuit section 6 to an output terminal section 7a and an output terminal section 7 respectively.
b to the CS tuner 2a via the coaxial cables D2 and D3, respectively. The received signal (vertical 1) is converted into a signal corresponding to the television receiver 2 by each CS tuner 2a and output to the television receiver 2. When the CS tuner 2a connected to the output terminal unit 7a receives the reception signal (horizontal 2) from the CS antenna 1b from the above state, the satellite selection control signal of 32 to 53 kHz is superimposed from the CS tuner 2a. DC voltage of DC15V, coaxial cable D2, D3
Is supplied from the output terminal portion 7a to the switching circuit portion 6 via. The switching circuit unit 6 senses this DC voltage and closes the rightmost side (in FIG. 2) of the switch, and this DC voltage is
The DC voltage of DC 11V described above is the CS receiving antenna 1a.
Similarly to that supplied to the CS receiving antenna 1b, the received signal (horizontal 2) is transmitted from the CS receiving antenna 1b to the CS tuner 2a and converted into a signal corresponding to the television receiver 2 and converted to the television receiver 2. It is output to the receiver 2.

The above-described usage example is an example, and the switching distributor 20 includes each C connected to the output terminal portions 7a to 7d.
The received signal can be distributed to the S tuner 2a, and C
The received signal (vertical 1), the received signal (horizontal 1), the received signal (vertical 2), and the received signal (horizontal 2) from the S antenna 1a and the CS antenna 1b are respectively received by the respective CS tuners 2.
can be output to a.

From the above, the vertically polarized wave signal and the horizontally polarized wave signal from the CS antenna 1a, and the vertically polarized wave signal and the horizontally polarized wave signal from the CS antenna 1b can be distributed to a plurality of terminals, respectively. The switching distributor 20 can be selected from a vertical polarization signal and a horizontal polarization signal of the first communication satellite and a vertical polarization signal and a horizontal polarization signal of the second communication satellite by connecting only one coaxial cable. Can be selectively received. Therefore, indoor wiring work is facilitated, and it is not necessary to provide a switching device separately from the distributor.

Next, the operation of reducing the signal boarding between the signal transmission lines in the switching distributor 20 of this embodiment will be described. Here, the signal boarding between signal transmission lines means that a signal transmitted through a certain transmission line leaks into another transmission line and boards. 5A and 5B are configuration diagrams showing a casing of the switching distributor according to the embodiment of the present invention, FIG. 5A is a side view, FIG. 5B is a front view, and FIG. 5C is a bottom view. Figure 6
It is explanatory drawing which shows the connection state of the shield plate and housing | casing of the switching distributor which concerns on embodiment of this invention, (a) is a side view,
(B) is a front view and (c) is a bottom view. FIG. 7 is an explanatory diagram showing a connection state between the ground pattern provided on the circuit board of the switching distributor according to the embodiment of the present invention and the housing,
It is sectional drawing in the cross section AA of FIG.

The casing of the switching distributor 20 is made of a metal conductor, and the rear surface (left side of FIG. 5 (a)) of the housing is attached to the construction surface. The circuit board 30 faces the back surface and the construction surface. As shown in FIG. 5, the input terminal portion 3a
3d and the output terminal portions 7a to 7d are arranged on surfaces orthogonal to the construction surface (upper side and lower side in FIG. 5A), and are arranged on surfaces facing each other. In addition, the front of the housing (see FIG.
On the right side of (a), five screw holes (not shown) into which the screws 8 that electrically connect the shield plate 13 and the housing are screwed are provided near each input terminal portion, and the circuit is provided. Three screw holes (not shown) into which the screws 11 that electrically connect the ground pattern 31 of the substrate 30 and the housing are screwed are provided. Further, an elongated hole 10 into which the screw 9 is attached is provided on the same surface along a line connecting the output terminal portion corresponding to the input terminal portion, and the screw 9 is movable along the elongated hole 10. It is like this.

As shown in FIG. 6, the screws 8 are inserted through the corresponding screw holes to come into contact with the shield plate 13 incorporated in the housing, thereby being electrically connected. Which of the screws 8a to 8e is to be attached can be freely selected by an operation from the outside of the housing. In this way, the connection state between the shield plate 13 and the housing, which is the ground, can be changed, and the aerial radiation state of the received signal from the vicinity of the amplifier circuit section 4 can be changed. Therefore, it becomes possible to adjust the amount of the aerial radiation signal which becomes a transfer interference wave for other signal transmission lines, and by installing the screws 8a to 8e so that the transfer quantity of the interference wave becomes smaller, The amount of wave transfer can be reduced.

Further, as shown in FIG. 6 (c), the shield plate 13 installed in the switching distributor 20 has a plane orthogonal to the circuit board 30 of the shield plate 13 (left side of FIG. 6 (c)). By bending the right side) multiple times, it has a structure with elasticity. Therefore, by adjusting the tightening amount of the screw 8, the distance between the surface of the shield plate 13 facing the circuit board 30 (the upper side in FIG. 6C) and the amplification circuit section 4 covered by the shield plate 13 is adjusted. Can be changed,
The aerial radiation state of the received signal from the vicinity of the amplifier circuit unit 4 can be changed. Therefore, by adjusting the tightening amount of the screws 8a to 8e so that the transfer amount of the interfering wave is smaller, the transfer amount of the interfering wave can be reduced. Note that the present invention is not limited to this, and a metal having elastic force such as a spring is formed on a portion of the shield plate 13 that forms a surface (left side and right side of FIG. 6C) orthogonal to the circuit board 30. A conductor may be used.

Further, in this switching distributor 20, as shown in FIG. 6, by moving the screw 9 in the longitudinal direction of the elongated hole 10, the movable shield plate 14 attached by a bolt 15 near the tip of the screw 9 is provided. It has a sliding structure. Therefore, the movable shield plate 14 is inserted between the amplifying circuit portion 4 covered with the shield plate 13 and the surface of the shield plate 13 facing the circuit board 30 (the upper side in FIG. 6C), and the amplifying circuit The distance of the space between the part 4 and the shield can be changed. Therefore, the amount of interference wave transfer can be reduced by moving the screw 9 to adjust the position of the movable shield plate 14 so that the amount of interference wave transfer is reduced.

Further, as shown in FIG. 7, the screw 11 is inserted through the corresponding screw hole to form the ground pattern 31 formed on the circuit board 30 incorporated in the housing.
It is electrically connected by making contact with. Here, as shown in FIG. 2, the ground pattern 31 includes the circuit board 30.
The screw connection portion 12 from which the insulating coating is removed is provided, and the screw 11 is electrically connected to that position. Which of these screws 11a to 11c is to be attached can be freely set by an operation from the outside of the housing. In this way, by changing the connection state between the ground pattern 31 of the circuit board 30 and the casing, which is the ground, the ground that becomes a transfer interference wave for other signal transmission lines (the signal line pattern 32 in FIG. 7 and the like). It is possible to adjust the transfer amount of the signal via the pattern 31. Therefore, the screw 1 should be adjusted so that the amount of interference wave transfer is reduced.
By attaching 1a to 11c, it is possible to reduce the amount of transfer of interfering waves.

[0029]

As described above, the switching distributor according to claim 1 of the present invention receives a plurality of input terminal portions to which received signals of a plurality of systems are respectively inputted, and receives a radio wave from a satellite. A plurality of output terminals to which a plurality of receiving terminals are respectively connected, a plurality of amplifier circuits for amplifying received signals from the respective input terminal portions, and the received signals amplified by the amplifier circuits are respectively distributed. A plurality of distribution circuits, and a plurality of switching circuits that select the output of one distribution circuit from all the distribution circuits according to an instruction from the receiving terminal. Since the amplifier circuit is covered with a shield made of metal and at least one screw hole into which a screw electrically connecting the shield and the casing is screwed is provided on the outer surface of the casing, the reception signals of a plurality of systems are received. Choose Select by enabling output from one output terminal portion, to facilitate indoor wiring work in,
In addition, it is not necessary to provide a switching device separately from the distributor, and by mounting the screw so that the amount of transfer of the interfering wave between the signal transmission lines is smaller, the transfer amount of the interfering wave can be reduced. it can.

According to a second aspect of the present invention, there is provided the switching distributor according to the first aspect, wherein the casing is mounted so as to abut on a construction surface, and the casing has a surface abutting on the construction surface. A plurality of screw holes into which screws for electrically connecting the shield and the housing are screwed are provided on the surface facing each other, and the screws are freely attached and detached in the corresponding screw holes. The screw can be attached or detached so that the amount of transfer of the interfering wave is smaller, and the amount of transfer of the interfering wave can be reduced.

According to a third aspect of the present invention, there is provided the switching distributor according to the first or second aspect, wherein the casing is attached so as to abut a construction surface, and the input terminal portion and the output terminal portion are provided. And a circuit board provided to face the construction surface and connected to each other, and a surface of the shield that connects the circuit board and a surface of the shield that is orthogonal to the circuit board. Since it is formed of a metal elastic body, the amount of interference wave transfer can be adjusted by adjusting the tightening amount of the screw that electrically connects the shield and the housing so that the amount of interference wave transfer is less. Can be reduced.

According to a fourth aspect of the present invention, there is provided the switching distributor according to the first to third aspects, wherein the casing is attached so as to abut against a construction surface, and the input terminal portion and the output terminal portion are attached. Each of which is connected to each other and is provided so as to face the construction surface, and a screw for electrically connecting the ground pattern of the circuit board and the housing is screwed onto the outer surface of the housing. Since at least one screw hole is provided, the amount of interference wave transfer can be reduced by mounting the screw so that the amount of interference wave transfer is smaller.

A switching distributor according to a fifth aspect is the switching distributor according to the fourth aspect, in which a ground pattern of the circuit board and the ground pattern are provided on a surface of the housing that faces a surface in contact with a construction surface. A plurality of screw holes into which screws that electrically connect to the housing are screwed are provided, and the screws are freely attached and detached in the corresponding screw holes, so that the amount of transfer of interference waves is reduced. The screw can be attached or removed, and the amount of interference wave transfer can be reduced.

A switching distributor according to a sixth aspect is the switching distributor according to any one of the first to fifth aspects, wherein a metal plate is slidable in a space between the amplification circuit and the shield. With this configuration, it is possible to reduce the amount of interference wave transfer by moving the metal plate and adjusting the position so that the amount of interference wave transfer is smaller.

[Brief description of drawings]

FIG. 1 is a diagram showing a C using a switching distributor according to an embodiment of the present invention.
It is a connection diagram showing an example of an S broadcast receiving system.

FIG. 2 is a circuit diagram showing a switching distributor according to an embodiment of the present invention.

FIG. 3 is a circuit diagram showing an amplifier circuit unit of the switching distributor according to the embodiment of the present invention.

FIG. 4 is a circuit diagram showing a distribution circuit unit of the switching distributor according to the embodiment of the present invention.

FIG. 5 is a configuration diagram showing a casing of the switching distributor according to the embodiment of the present invention.

FIG. 6 is an explanatory diagram showing a connection state between the shield plate and the casing of the switching distributor according to the embodiment of the present invention.

FIG. 7 is an explanatory diagram showing a connection state between the ground pattern provided on the circuit board of the switching distributor according to the embodiment of the present invention and the housing.

[Explanation of symbols]

3a to 3d input terminal section 4 amplification circuit section 5a-5c 2 distribution circuit section 6 Switching circuit section 7a to 7d output terminal section 8a-8e screw 11a-11c screw 13 Shield plate 14 Movable shield plate 20 Switching distributor 30 circuit board 31 ground pattern

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Claims (6)

[Claims] 1. A plurality of input terminal portions to which received signals of a plurality of systems are respectively input, a plurality of output terminal portions to which a plurality of receiving terminals for receiving and processing radio waves from satellites are respectively connected, A plurality of amplifying circuits for amplifying the received signal from the input terminal section, a plurality of distributing circuits for respectively distributing the received signals amplified by the respective amplifying circuits, and all of them according to an instruction from the receiving terminal. A plurality of switching circuits for selecting the output of one distribution circuit from the distribution circuit are provided in one metal housing, and the amplification circuit is covered with a shield made of metal,
A switching distributor comprising at least one screw hole into which a screw that electrically connects the shield and the casing is screwed, on the outer surface of the casing. 2. The housing is attached so as to abut on a construction surface, and the shield and the housing are electrically connected to a surface of the housing that faces the surface abutting on the construction surface. 2. The switching distributor according to claim 1, wherein a plurality of screw holes into which the corresponding screws are screwed are provided, and the screws are freely attached and detached in the corresponding screw holes. 3. The circuit board, wherein the housing is attached so as to abut against a construction surface, and the input terminal portion and the output terminal portion are connected to each other and the circuit board is provided so as to face the construction surface. The switch according to claim 1 or 2, wherein a surface of the shield, which connects the circuit board and the surface of the shield facing the circuit board, is orthogonal to the circuit board, and is formed of a metal elastic body. Distributor. 4. A circuit board, wherein the housing is attached so as to abut against a construction surface, the input terminal portion and the output terminal portion are connected to each other, and the circuit board is provided so as to face the construction surface. The outer surface of the housing is provided with at least one screw hole into which a screw electrically connecting the ground pattern of the circuit board and the housing is screwed. The switching distributor according to any one of the above. 5. A plurality of screw holes, into which screws for electrically connecting the ground pattern of the circuit board and the casing are screwed, on a surface of the casing facing the surface abutting on the construction surface. 5. A switching distributor as claimed in claim 4, characterized in that the screws are freely attached and detached in corresponding screw holes. 6. The switching distributor according to claim 1, wherein a metal plate is slidably arranged in a space between the amplifier circuit and the shield.