JP7629419B2 - Transmitting Device - Google Patents

Description

The present invention relates to a transmitting device that is provided with multiple transmitters and multiple antennas to achieve redundancy.

Broadcast transmission devices are designed to be redundant in order to prevent broadcasts from being stopped due to sudden events such as equipment failure. For example, a configuration is described in Patent Document 1, for example, in which two transmission units are used, one of which is a normal transmission unit (active system) and the other is a backup transmission unit (standby system) to be used in the event of a failure of the active system, and the output of the active transmission unit and the output of the standby transmission unit are switched between them using a coaxial switch depending on the situation and output from the antenna.

As with the switching of the transmission section, the antennas can be switched depending on the situation. Such a configuration is described, for example, in Patent Document 2. When multiple antennas are used, a single signal from the active or standby system can be split into two systems by a power splitter, and each signal can be input to a different antenna, thereby achieving high gain.

In addition, to ensure that output is not temporarily interrupted when switching between the active and standby systems, the two transmitters are constantly operating and both constantly emit the two signals mentioned above. For this reason, the signal that is not input to the antenna (not used) is input to a pseudo antenna separate from the actual antenna, and is thus radiated as heat rather than electromagnetic waves.

To achieve this type of signal switching, multiple four-terminal coaxial switches are used, as described in Patent Documents 1 and 2, which switch the connections between two input terminals and two output terminals in two ways.

JP 2006-129333 A JP 2000-324408 A

In conventional technology, as described above, it was possible to switch between transmitters and antennas to be used, but the combinations of transmitters and antennas to be used were limited. For this reason, for example, if one of the two antennas was unavailable and one of the two transmitters was broken, it was sometimes impossible to output.

For this reason, there was a demand for a transmission device that could be more effectively used to prevent operation from stopping in an emergency by changing the combination of the transmission unit and antenna used.

The present invention was developed in light of these circumstances, and aims to solve the above problems.

The present invention provides a transmitting device in which a first signal emitted from a first transmitting section and a second signal emitted from a second transmitting section are switched and emitted from an antenna, the transmitting device comprising a first antenna and a second antenna as the antennas, a power splitter which distributes a selected one of the first signal and the second signal into two systems and outputs the power splitter, and a plurality of coaxial switchers in each of which a combination of connections between two input terminals and two output terminals is switched in two ways, and a first antenna side coaxial switcher and a second antenna side coaxial switcher, both of which are one of the coaxial switchers, are connected to the first antenna and the second antenna, respectively, and the first antenna side coaxial switcher and the second antenna side coaxial switcher ... side coaxial switcher. The coaxial switch on the first antenna side, the coaxial switch on the second antenna side, and the other coaxial switch are also connected to each other, and depending on the settings of the first antenna side coaxial switch, the coaxial switch on the second antenna side, and the other coaxial switch, the following operations are switched between: one of the first signal and the second signal is selected and output from the first antenna and the second antenna; only the first signal is output from the first antenna and no signal is output from the second antenna; only the second signal is output from the second antenna and no signal is output from the first antenna; only the first signal is output from the second antenna and no signal is output from the first antenna; and only the second signal is output from the first antenna and no signal is output from the second antenna.
At this time, the first antenna side coaxial switch is set to a first state in which the first signal distributed by the power distributor or the second signal distributed by the power distributor is input to the first antenna, or the first signal not passing through the power distributor is input to the first antenna, and a second state in which the second signal output from the second antenna side coaxial switch is input to the first antenna, or the first signal is input to the second antenna side coaxial switch without inputting either the first signal or the second signal to the first antenna, The second antenna side coaxial switch may be set by switching between a third state in which the first signal distributed by the power splitter or the second signal distributed by the power splitter is input to the second antenna, or the second signal not passing through the power splitter is input to the second antenna, and a fourth state in which the first signal output from the first antenna side coaxial switch is input to the second antenna, or the second signal is input to the first antenna side coaxial switch without inputting either the first signal or the second signal to the second antenna.
The power distributor may also be provided with an uninterruptible power switch that switches the input signal to the power distributor, and when the uninterruptible power switch fails, any of the following operations may be selected: only the first signal is output from the first antenna and no signal is output from the second antenna; only the second signal is output from the second antenna and no signal is output from the first antenna; only the first signal is output from the second antenna and no signal is output from the first antenna; and only the second signal is output from the first antenna and no signal is output from the second antenna.

According to the present invention, by changing the combination of the transmitter and antenna used, it is possible to obtain a transmitting device that is more effective in preventing operation from stopping in an emergency.

FIG. 1 is a diagram illustrating a configuration of a transmitting device as a reference example. 1A and 1B are diagrams illustrating the configuration and operation of a coaxial switcher. FIG. 1 is a diagram showing the operation (part 1) of a transmitting device according to a reference example. FIG. 13 is a diagram showing the operation (part 2) of a transmitting device according to a reference example. FIG. 11 is a diagram showing the operation (part 3) of a transmitting device according to a reference example. 1 is a diagram showing a configuration of a transmitting device according to an embodiment of the present invention; FIG. 2 is a diagram showing an operation (part 1) of a transmitting device according to an embodiment of the present invention. FIG. 11 is a diagram showing the operation (part 2) of the transmitting device according to the embodiment of the present invention. FIG. 11 is a diagram showing the operation (part 3) of the transmitting device according to the embodiment of the present invention. FIG. 11 is a diagram showing the operation (part 4) of the transmitting device according to the embodiment of the present invention. 2 is a diagram illustrating a combination of a transmitting unit and an antenna realized in a transmitting device according to an embodiment of the present invention. FIG.

Next, a specific embodiment of the present invention will be described with reference to the drawings. First, as a reference example, the configuration and operation of a transmitting device using two transmitting units and two antennas will be described. FIG. 1 is a diagram showing the configuration of this transmitting device 9. Here, a first transmitting unit (active system) 11 that emits a signal (first signal) S1 and a second transmitting unit 12 (standby system) that emits a signal (second signal) S2 are used. In this transmitting device 9, either the signal S1 or S2 is switched to be emitted from the antenna.

In addition, a first antenna 21 and a second antenna 22 are provided as antennas. In this transmitting device 9, an operation is performed in which a common signal (either signal S1 or S2) is emitted from the first antenna 21 and the second antenna 22, and an operation is performed in which either signal S1 or S2 is emitted only from either the first antenna 21 or the second antenna 22. In addition, a spare antenna 23 is also provided as an emergency antenna, and an operation is performed in which either signal S1 or S2 is emitted only from the spare antenna 23. However, since the characteristics of the spare antenna 23 are inferior to those of the first antenna 21 and the second antenna 22, when a single antenna is used, it is preferable to use one of the first antenna 21 and the second antenna 22, and it is preferable to use the spare antenna 23 only when there is an abnormality in the first antenna 21 and the second antenna 22.

As described above, since the first transmitting unit 11 constantly emits a signal (first signal) S1, and the second transmitting unit 12 constantly emits a signal (second signal) S2, the signal S1 or S2 that is not emitted from the antenna must be terminated by being thermalized rather than emitted as an electromagnetic wave. For this reason, a pseudo antenna 24 is provided. A maintenance pseudo antenna 25 is also provided, which has the same function as the pseudo antenna 24, but is used to terminate signals in order to operate the first transmitting unit 11 and the second transmitting unit 12 without emitting any signals from the antenna, particularly during maintenance of the transmitting device 9.

As described above, a power distributor 13 is provided to distribute the selected signal into two systems in order to output a common signal (either signal S1 or S2) from the first antenna 21 and the second antenna 22. The input of the power distributor 13 is set to a state in which either signal S1 or S2, or no signal is input at all.

In this transmitting device 9, the above components are combined with multiple coaxial switchers that only perform the operation of switching signals. The coaxial switch used has two input terminals and two output terminals, similar to those described in Patent Documents 1 and 2. Figure 2 is a diagram showing the configuration and operation of this coaxial switch 30. In Figure 2(a), the four terminals of this coaxial switch 30 are A to D as shown in the figure.

The coaxial switch 30 can be in two states, as shown in FIG. 2(b) and FIG. 2(c). FIG. 2(b) shows the state in which terminals A and B are connected and terminals C and C are connected, while FIG. 2(c) shows the state in which terminals A and D are connected and terminals B and C are connected. For this reason, if one of the pair of terminals A and C and the pair of terminals B and D is the input side and the other is the output side, it is possible to select one of two combinations of terminals on the input side and the output side.

In the configuration of FIG. 1, coaxial switches 30A to 30E are provided, which are the coaxial switch 30 described above. As described above, there are three inputs to the power distributor 13: either signal S1, S2, or no input. Of these, since it is required that no interruption occurs when switching between signals S1 and S2, a non-interruption switch 31 is provided on the input side of the power distributor 13, which performs the same operation of switching the states of FIG. 2(b) and (c) in the coaxial switch 30, but does not cause an interruption when switching.

In FIG. 1, the control unit 41 can recognize the states of the first transmission unit 11, the second transmission unit 12, the first antenna 21, and the second antenna 22, and in response to this, or by the administrator's operation of the operation unit 42 (keyboard, touch panel, etc.), controls the connection of the coaxial switches 30A-30E and the uninterruptible transmission switch 31 to either FIG. 2(b) or (c), thereby realizing the operation described below. At this time, in addition to this control, the coaxial switches 30A-30E and the uninterruptible transmission switch 31 output information indicating whether they are currently in FIG. 2(b) or (c), so that the control unit 41 can recognize the state. The state of each switch is displayed on the display unit 43. The display unit 43 also displays other information related to the control of this transmission device 9.

In the configuration of Fig. 1, depending on the settings of each coaxial switch and non-stop switch 31, (1) the operation of distributing the signal S1 and transmitting it from the first antenna 21 and the second antenna 22, (2) the operation of distributing the signal S2 and transmitting it from the first antenna 21 and the second antenna 22, (3) the operation of transmitting the signal S1 only from the auxiliary antenna 23, (4) the operation of transmitting the signal S2 only from the auxiliary antenna 23, (5) the operation of transmitting the signal S1 only from the first antenna 21 and not transmitting a signal from the second antenna 22, and (6) the operation of transmitting the signal S2 only from the second antenna 22 and not transmitting a signal from the first antenna 21. Figs. 3(a) and (b) show the connection states of each coaxial switch and non-stop switch 31 in the configuration of Fig. 1 in the above operations (1) and (2), Figs. 4(c) and (d) show the above operations (3) and (4), and Figs. 5(e) and (f) show the above operations (5) and (6). Here, in each coaxial switch, the connections are depicted as arc lines as shown in Figures 2(b) and (c), and in the non-stop switch 31, the connections are depicted as straight lines instead of arc lines. Also, in Figures 3 to 5, the control unit 41, operation unit 42, and display unit 43 are omitted.

In FIG. 3(a), the signal S1 output from the non-stop switching device 31 is input to the power splitter 13, which is then distributed and input to the first antenna 21 and the second antenna 22. Meanwhile, the unused signal S2 is terminated at the dummy antenna 24. Conversely, in FIG. 3(b), the signal S2 output from the non-stop switching device 31 is input to the power splitter 13, which is then distributed and input to the first antenna 21 and the second antenna 22. Meanwhile, the unused signal S1 is terminated at the dummy antenna 24.

In FIG. 4(c), signal S1 is input directly to the spare antenna 23 without passing through the power distributor 13, and unused signal S2 is input to the maintenance pseudo antenna 25. There are no input signals to the first antenna 21 and the second antenna 22. In FIG. 4(d), signal S2 is input directly to the spare antenna 23 without passing through the power distributor 13, and unused signal S1 is input to the maintenance pseudo antenna 25. In this case too, there are no input signals to the first antenna 21 and the second antenna 22.

In FIG. 5(e), signal S1 is input to the first antenna 21 without passing through the power distributor 13, and unused signal S2 is input to the maintenance pseudo antenna 25. There are no input signals to the second antenna 22 and the spare antenna 23. In FIG. 5(f), signal S2 is input to the second antenna 22 without passing through the power distributor 13, and unused signal S1 is input to the maintenance pseudo antenna 25. There are no input signals to the first antenna 21 and the spare antenna 23.

In this manner, in this transmitting device 9, the above operations (1) to (6) are realized by controlling the coaxial switches 30A to 30E and the non-stop transmission switch 31 by the control unit 41. Therefore, for example, if one of the first transmitting unit 11 or the second transmitting unit 12 fails, it is possible to operate using only one of them. Similarly, if one of the first antenna 21 or the second antenna 22 fails, it is possible to operate using only one of them or to operate using the spare antenna 23.

As described above, (5) the operation of emitting signal S1 only from the first antenna 21 (FIG. 5(e)) and (6) the operation of emitting signal S2 only from the second antenna 22 (FIG. 5(f)) are possible. However, for example, an abnormality may occur simultaneously in the first transmitting unit 11 and the first antenna 21, and an abnormality may occur simultaneously in the second transmitting unit 21 and the second antenna 22. For this reason, it is preferable that (7) the operation of emitting signal S1 only from the second antenna 22 and (8) the operation of emitting signal S2 only from the first antenna 21 are also possible. In other words, it is preferable that there are no restrictions on the combination of transmitting units and antennas.

However, such operations (7) and (8) are not possible with the configuration of FIG. 1. Therefore, if an abnormality occurs simultaneously in the first transmitting unit 11 and the first antenna 21, or if an abnormality occurs simultaneously in the second transmitting unit 21 and the second antenna 22, the transmitting device 9 may not emit a signal.

In contrast, FIG. 6 is a diagram showing the configuration of a transmitting device 1 according to an embodiment of the present invention. In this case, compared to the transmitting device 9 described above, a coaxial switch (first antenna side coaxial switch) 30F is added to the first antenna 21 side, and a coaxial switch (second antenna side coaxial switch) 30G is added to the second antenna 22 side. In addition, the coaxial switches 30F and 30G are also connected to each other.

Here too, there are provided a control unit 51 that controls the entire transmitting device 1 and switches between operations, an operation unit 52 used by the administrator, and a display unit 53 that displays information during this control. In this transmitting device 1, Figs. 7(a) and (b) show the above operations (1) and (2), Figs. 8(c) and (d) show the above operations (3) and (4), and Figs. 9(e) and (f) show the above operations (5) and (6), showing the connection states of each coaxial switch and nonstop transmission switch 31.

On the other hand, in this transmitting device 1, the above states (7) and (8) can also be realized. Figures 10(g) and (h) show the connection states in the above states (7) and (8). That is, by adding coaxial switches 30F and 30G to the transmitting device 9, the above states (7) and (8) can also be realized. Therefore, even if an abnormality occurs simultaneously in the first transmitting unit 11 and the first antenna 21, or an abnormality occurs simultaneously in the second transmitting unit 21 and the second antenna 22, a signal can be transmitted normally by appropriately changing the combination of the transmitting unit and the antenna.

The operations of the coaxial switcher (first antenna side coaxial switcher) 30F and the coaxial switcher (second antenna side coaxial switcher) 30G in this case corresponding to the states of Fig. 2(b) and (c) will be specifically described. Here, the first and second states are defined as the cases where the coaxial switcher 30F is in the state of Fig. 2(b) and the state of Fig. 2(c), respectively, and the third and fourth states are defined as the cases where the coaxial switcher 30G is in the state of Fig. 2(b) and the state of Fig. 2(c), respectively. That is, the first and second states are set by switching in the coaxial switcher 30F, and the third and fourth states are set by switching in the coaxial switcher 30G, thereby switching between the above-mentioned multiple operations including (7) and (8).

When the coaxial switch 30F is in the state shown in FIG. 2(b) (first state), connection (1) (2) (FIGS. 7(a) (b)) is realized in which the signal S1 or the signal S2 distributed by the power splitter 13 is input to the first antenna 21, and connection (5) (FIG. 9(e)) is realized in which the signal S1 not passing through the power splitter 13 is input to the first antenna 21. In FIG. 9(f), connection (6) is realized in which the signal S2 not passing through the power splitter 13 is input to the second antenna 22, and in FIG. 8(c) (d), connection (3) (4) is realized in which the signal S1 or S2 not passing through the power splitter 13 is input to the auxiliary antenna 23. In these cases, the coaxial switch 30F is also in the state shown in FIG. 2(b). However, in these cases, neither the signal S1 nor the signal S2 flows through any path in the coaxial switch 30F, so in these cases, the setting of the coaxial switch 30F is actually arbitrary.

When the coaxial switch 30F is in the state shown in FIG. 2(c) (second state), a connection (8) (FIG. 10(h)) is realized in which the signal S2 output from the coaxial switch 30G is input to the first antenna 21, or a connection (7) (FIG. 10(g)) is realized in which neither the signal S1 nor the signal S2 is input to the first antenna 21, and the signal S1 is input to the coaxial switch 30G.

When the coaxial switch 30G is in the state shown in FIG. 2(b) (third state), connection (1) (2) (FIGS. 7(a) (b)) is realized in which the signal S1 or the signal S2 distributed by the power splitter 13 is input to the second antenna 22, and connection (6) (FIG. 9(f)) is realized in which the signal S2 not passing through the power splitter 13 is input to the second antenna 22. In FIG. 9(e), connection (5) is realized in which the signal S1 not passing through the power splitter 13 is input to the first antenna 21, and in FIG. 8(c) (d), connection (3) (4) is realized in which the signal S1 or S2 not passing through the power splitter 13 is input to the auxiliary antenna 23. In these cases, the coaxial switch 30F is also in the state shown in FIG. 2(b). However, in these cases, neither the signal S1 nor the signal S2 flows through any path in the coaxial switch 30G, so in reality, the setting of the coaxial switch 30G in this case is arbitrary.

When the coaxial switch 30G is in the state shown in FIG. 2(c) (fourth state), a connection (7) (FIG. 10(g)) is realized in which the signal S1 output from the coaxial switch 30F is input to the second antenna 22, or a connection (8) (FIG. 10(h)) is realized in which neither the signal S1 nor the signal S2 is input to the second antenna 22, and the signal S2 is input to the coaxial switch 30F.

In other words, by appropriately selecting and combining these states in the coaxial switches 30F and 30G, the above states (1) to (8) are realized.

Figure 11 is a simplified schematic diagram showing the combinations of the settings of the transmitter and antenna in this transmitter 1. There are two cases for selecting the transmitter: either the first transmitter 11 (signal S1) or the second transmitter 12 (signal S2). There are four cases for selecting the antenna: (a) using both the first antenna 21 and the second antenna 22, (b) using only the first antenna 21, (c) using only the second antenna 22, and (d) using only the spare antenna 23. In the transmitter 1 described above, all of these combinations of 2 x 4 = 8 operations are possible. Here, the combinations are shown with solid lines, and the corresponding operations (1) to (8) are shown on the lines. The default state is (1) in which the first transmitter 11 is used as the transmitter and the first antenna 21 and second antenna 22 are used as the antennas, but combinations (2) to (8) can be realized depending on the state of the transmitter 1.

Here, when the first transmitting unit 11 fails, the above operations (2), (4), (6), and (8) (Figs. 7(b), 8(d), 9(f), and 10(h)) are possible, and when the second transmitting unit 12 fails, the above operations (1), (3), (5), and (7) (Figs. 7(a), 8(c), 9(e), and 10(g)) are possible. When the first antenna 21 fails, the above operations (3), (4), (6), and (7) (Figs. 8(c)(d), 9(f), and 10(g)) are possible, and when the second antenna 22 fails, the above operations (3), (4), (5), and (8) (Figs. 8(c)(d), 9(e), and 10(h)) are possible.

In the above operations (3) and (4) (FIG. 8(c) and (d)), no signal is supplied to either the first antenna 21 or the second antenna 22, and no signal is supplied to the power distributor 13. In the above operations (5), (6), (7), and (8) (FIGS. 9(e) and (f), 10(g) and (h)), no signal is supplied to the continuous transmission switch 31 and the power distributor 13. For this reason, as shown in FIG. 11, even if the power distributor 13 fails, the operations (3) and (4) using only the spare antenna are possible, and even if the continuous transmission switch 31 or the power distributor 13 fails, the operations (5), (6), (7), and (8) using only one of the antennas are possible.

In this way, the above-mentioned transmitting device 1 can switch its operation depending not only on the status of the transmitting unit and antenna, but also on the status of the non-stop transmission switch 31 and power distributor 13. The control unit 51 controls such switching automatically or by the administrator's operation according to the status of these components.

When the control unit 51 cannot recognize the signal (first signal) S1 from the first transmission unit 11, or when the control unit 51 cannot recognize the signal (second signal) S2 from the second transmission unit 12, it can recognize that there is an abnormality in the first transmission unit 11 or the second transmission unit 12, respectively. Furthermore, when the radio wave intensity of the output of the first antenna 21 is low despite the signal being input to the first antenna 21, or when the radio wave intensity of the output of the second antenna 22 is low despite the signal being input to the second antenna 22, it can recognize that there is an abnormality in the first antenna 21 or the second antenna 22, respectively. The same applies to the spare antenna 23.

In addition, if there is an input to the power distributor 13 but the respective distributed outputs are not obtained, the control unit 51 can recognize that there is an abnormality in the power distributor 13.

The control unit 51 sets the switches (coaxial switches 30A-30G, uninterruptible transmission switch 13) to either the state in FIG. 2(b) or the state in FIG. 2(c). If this setting is not performed according to control, or if the control unit 51 is unable to determine which of these states is currently in (if it is unable to recognize either state, or if it recognizes that it is in both states), it can recognize that there is an abnormality in this switch. Also, if the uninterruptible transmission switch 13 is provided with an internal power supply, it can also recognize that there is an abnormality in the uninterruptible transmission switch 13 if an abnormality is detected in this internal power supply.

The control unit 51 can display on the display unit 53 whether or not there is an abnormality in each component including such a switch, and the status recognized by each switch. As described above, the switching of the above operations (1) to (8) may be performed automatically by the control unit 51, or may be performed by an administrator using the operation unit 52, at which time the administrator can check the status of each component on the display unit 53. The content to be displayed on the display unit 53 may be transmitted to an external device outside the transmitting device 1 using a network or the like, and the administrator may perform this operation using an external remote control device or the like.

The above-mentioned transmitting device 1 is configured by adding coaxial switches 30F and 30G to the transmitting device 9 in Fig. 1. However, the same operation as the transmitting device 9 in Fig. 1 can also be realized with other configurations, particularly different combinations of coaxial switches. In this case, the same operation can be achieved by using the first antenna side coaxial switch and the second antenna side coaxial switch in the same way.

The present invention has been described above based on an embodiment. This embodiment is merely an example, and it will be understood by those skilled in the art that various modifications are possible in the combination of the components, and that such modifications are also within the scope of the present invention.

1, 9 Transmitter 11 First transmitter 12 Second transmitter 13 Power distributor 21 First antenna 22 Second antenna 23 Spare antenna 24 Dummy antenna 25 Maintenance dummy antenna 30, 30A to 30E Coaxial switch 30F Coaxial switch (first antenna side coaxial switch)
30G coaxial switch (second antenna side coaxial switch)
31 Continuous transmission switch 41, 51 Control unit 42, 52 Operation unit 43, 53 Display unit S1 Signal (first signal)
S2 signal (second signal)

Claims (3)

A transmitting device in which a first signal emitted from a first transmitting unit and a second signal emitted from a second transmitting unit are switched and emitted from an antenna,
The antenna includes a first antenna and a second antenna,
a power distributor that distributes a selected one of the first signal and the second signal into two systems and outputs the two signals;
a plurality of coaxial switches each capable of switching between two combinations of connections between two input terminals and two output terminals;
Equipped with
a first antenna side coaxial switch and a second antenna side coaxial switch, both of which are one of the coaxial switches, are connected to the first antenna and the second antenna, respectively, and the first antenna side coaxial switch and the second antenna side coaxial switch are also connected to each other;
By setting the first antenna side coaxial switch, the second antenna side coaxial switch, and the other coaxial switches,
A transmitting device characterized by switching between the following operations: an operation in which either the first signal or the second signal is selected and output from the first antenna and the second antenna; an operation in which only the first signal is output from the first antenna and no signal is output from the second antenna; an operation in which only the second signal is output from the second antenna and no signal is output from the first antenna; an operation in which only the first signal is output from the second antenna and no signal is output from the first antenna; and an operation in which only the second signal is output from the first antenna and no signal is output from the second antenna. In the first antenna side coaxial switch,
a first state in which a connection is made to input the first signal divided by the power divider or the second signal divided by the power divider to the first antenna, or a connection is made to input the first signal not passing through the power divider to the first antenna;
a second state in which the second signal output from the second antenna side coaxial switch is input to the first antenna, or the first signal is input to the second antenna side coaxial switch without inputting either the first signal or the second signal to the first antenna;
is switched and set,
In the second antenna side coaxial switch,
a third state in which the first signal divided by the power divider or the second signal divided by the power divider is connected to the second antenna, or the second signal not passing through the power divider is connected to the second antenna;
a fourth state in which the first signal output from the first antenna side coaxial switch is input to the second antenna, or the second signal is input to the first antenna side coaxial switch without inputting either the first signal or the second signal to the second antenna;
was switched and set,
2. The transmitting device according to claim 1 . A non-stop switching device is provided for switching an input signal to the power distributor,
The transmitting device according to claim 1 or 2, characterized in that when the non-stop transmission switch fails, one of the following operations is selected: only the first signal is output from the first antenna and no signal is output from the second antenna; only the second signal is output from the second antenna and no signal is output from the first antenna; only the first signal is output from the second antenna and no signal is output from the first antenna; and only the second signal is output from the first antenna and no signal is output from the second antenna.

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