JP2001086047A - Space diversity in-phase synthesizing board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To notify the abnormality of a circuit or a device by detecting the abnormality according to a phase result comparison signal that is obtained by multiplying the output signal of a 1st AGC amplifier by the output signal of a 2nd AGC amplifier, a detection signal that shows the presence or absence of a main signal and a detection signal that shows the presence or absence of a sub-signal. SOLUTION: A 1st signal distributor 24#0 of a space diversity in-phase synthesizing board 1 branches an inputted 1st signal into the 2nd and 3rd signals, and a phase shifter 26 controls an inputted 4th signal and outputs a 5th signal. The 1st and 2nd detection circuits 36#0 and 36#1 detect the presence or absence of the 1st and 4th signals and output the 1st and 2nd detection signals. A phase comparison mixer 30 multiplies an outputted 8th signal of a 1st AGC amplifier 28#0 by an outputted 9th signal of a 2nd AGC amplifier 28#1 and outputs a phase comparison result signal that shows the phase difference of both signals. A 3rd detection circuit 38 detects the abnormality of a device or an input signal according to the phase comparison result signal and the 1st and 2nd detection signals and displays the abnormality via an alarm means 40.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a space diversity in-phase synthesizer (hereinafter referred to as SD) used for a multiplex radio apparatus.
COMB board), and particularly to determination of equipment abnormality and line abnormality.

[0002]

2. Description of the Related Art When communicating between land and land across the sea,
A multiplex wireless device is used from the viewpoint that the cost of infrastructure is lower when performing wireless communication than when performing communication by wire by laying a submarine cable. However, the multiplex radio apparatus has a drawback that fading is likely to occur due to multipath fading due to reflected waves on the sea surface or the like and influence of weather such as rainfall.

Therefore, in a multiplex radio apparatus, in order to avoid the influence of fading and improve reliability, the signal is transmitted by a counterpart multiplex radio apparatus using two antennas, one of which is separated by a certain distance or more, and the other is a sub. Signal is being received. The receiving board performs waveform shaping of the main main signal and the sub main signal, frequency conversion to the IF band, and AGC control, and outputs the main main signal and the sub main signal to the SD COMB board.

[0004] The SD COMB board rotates the phase of the sub main signal so as to match the phase of the main main signal input from the receiving board, synthesizes these main signals in phase, and outputs the synthesized signals to the demodulation board. I have. This is because, if there is an input of the same level, if the signal is synthesized in the same phase, the output power of the +6 dB SD COMB board can be increased as compared with the case of the single input. This is because even if the reception level of one of the antennas drops significantly depending on the state of the line, the input reception of the other antenna can be expected, so that the probability of line disconnection can be reduced.

FIG. 8 is a configuration diagram of a conventional SD COMB board. The signal distributor (HYB) 4 # 0 distributes the main input main signal into two. The main-side phase detection AGC amplifier 8 # 0 performs automatic gain control of the main main signal so that the amplitude becomes constant, and outputs the signal to the phase comparison mixer 10.
On the other hand, the EPS (Endless Phase Shifter) 2 is an E-range of -6V to 6V input to the SIN terminal and the COS terminal.
In accordance with the PS control signal, the signals are phase-corrected by the respective mixers, and then the signals are combined to form a signal distributor (HYB) 4 #
Output to 1. The signal distributor 4 # 1 distributes the phase-rotated sub main signal into two.

AGC amplifier 8 # 1 for phase detection on the sub side
Automatic gain control of the sub main signal is performed so that the amplitude becomes constant, and the signal is output to the phase comparison mixer 10. The phase comparison mixer 10 multiplies the output signals of the main-side phase detection AGC amplifier 8 # 0 and the sub-side phase detection AGC amplifier 8 # 1 to output a phase comparison voltage of 0 to + 5V indicating a phase difference. . The main and sub main signals input to the phase comparison mixer 10 are passed through the AGC amplifiers 4 # 0 and 4 # 1 because the input level of the mixer 10 is changed between the main and sub signals in order to obtain a correct phase comparison result. This is because they need to be at the same level.

FIG. 9 is a diagram showing the relationship between the phase comparison result voltage and the phase control of the EPS. In FIG. 9, the horizontal axis represents the phase difference (degree) on the sub side with respect to the main side, and the vertical axis represents the phase comparison result voltage (V). As shown in FIG. 9, the phase comparison result voltage includes a first band that delays the phase on the sub side, a second band that advances the phase on the sub side, and a third band that does not change the phase on the sub side.
It belongs to one of the bands (dead zone).

For example, the first band is from +2.7 V to +5.
0 V, the second band is 0 V to +2.3 V, and the dead band is +
2.3V to + 2.7V. Here, the reason why the dead zone is provided is to prevent the EPS 2 from finely moving in order to properly perform the in-phase synthesis. This is because if the phase is finely moved by the EPS2, an error is likely to occur in data reproduction in the demodulation board connected after the SD COMM board. The width of the dead zone is defined by the standard that the level of the combined signal of the main and sub at the time of both inputs is increased by 5.5 dB compared to the single input when the main and sub are at the same level. Determined to be satisfied. Note that the AGC amplifier 8
Since the outputs of # 0 and 8 # 1 are multiplied, if the phase comparison result voltage is located in the dead band, the in-phase synthesis is performed.
There is no one input or both inputs.

Assuming that the sub-side is + 150 ° and the phase is ahead of the main side and is at point A of +4.0 V, the EPS 2 rotates in a direction in which the phase is delayed. And
When the phase comparison result voltage reaches a dead zone of +2.3 V to +2.7 V, the phase rotation of the EPS 2 stops. Also,
Assuming that the sub side is −50 ° and the phase is behind the main side and the point B is +0.5 V, the EPS 2 rotates in the direction in which the phase advances. Then, when the phase comparison result voltage reaches a dead zone of +2.3 V to +2.7 V,
The phase rotation of the EPS2 stops.

The window comparator 12 determines whether the phase comparison result voltage is located in the first band, the second band, or the dead band, and rotates the phase in the delay direction, rotates the phase in the advance direction, or A 2-bit signal indicating which one of the rotation stops is output. Counter 14
Performs one of the operations of down-counting, up-counting and non-counting in synchronization with the clock in accordance with the 2-bit output signal of the window converter 12, and
Outputs a bit signal.

The rotation amount output to the SIN terminal and the COS terminal for instructing the EPS 2 to perform phase rotation is stored in the ROM 16 using the output of the 8-bit counter 14 as an address.
It is stored in advance according to the characteristics of S2. ROM16
Outputs an 8-bit rotation amount using the 8-bit output of the counter 14 as an address signal.

The D / A conversion section 18 performs digital / analog conversion of the rotation amount of each 8 bits, and outputs a -6V to 6V E
The signal is output to the SIN terminal and the COS terminal as a PS control signal. The EPS2 corrects the phase of the sub-input main signal by the mixer according to the phase rotation amounts input to the SIN terminal and the COS terminal, and then combines the two to form the HYB
4 Output to # 1. As a result, the phase of the sub main signal is rotated in a direction in which the phase comparison result voltage is located in the dead zone. On the other hand, the D / A converter 20 converts the 8-bit output of the counter 14 to 0 to 5V.

FIG. 10 is a perspective view of the EPS phase monitor shown in FIG. As shown in FIG.
2 sets the 8-bit counter value '00' (0V) to 0 ゜, '
FF '(5V) is set to 360 °, and the corresponding angle is indicated by a needle. Here, when the hand of the EPS phase monitor 22 is moving, the phase of the EPS 2 is rotating,
When the needle is stopped, it merely indicates that the phase difference result voltage is in the dead zone and the phase of EPS2 is not rotating.

When the phase of the EPS2 rotates in the same direction by 360 ° or more, the counter 14 is incremented from "FF" to "00" (or decremented from "00" to "FF"). So the meter needle
Once it returns to 0 ° (or 360 °), it moves again in the phase shift direction. That is, the pointer reciprocates.

[0015]

However, the conventional SD COMB panel has the following problems.

(1) In the current SD COMB panel, even if a device fails during operation, it cannot be notified to the outside.

(2) In a section where the state always changes, such as propagation over the sea, the line state always changes. In the case where the line is unstable due to such fading or the like, since the phase changes rapidly, the meter of the EPS phase monitor 22 fluctuates back and forth in a short period of time, and it appears as if a runaway has occurred. There are cases. The SD COMB board operates at a speed of 4000 ° / sec during operation in order to follow a sudden change in the line state and to prevent an error from occurring in the demodulation board.

If the movement continues for one second, the EPS phase monitor 22
The needle meter reciprocates 11 times / sec, and if it continues to move for a long time, this may appear to a third party as a malfunction of the device. At that time, the SD COMB board itself is fully moving to in-phase synthesis. In such a case, the third party replaces the unit even though the device is normal. Or, when a complaint comes from a third party, the maintenance staff and technician have to go to the site even though they are operating normally.

(3) Even if there is no input signal of the main main signal or the sub main signal due to a line abnormality, the conventional SD COM
Board B could not inform it.

(4) If the SD COMB board fails and signals are combined in opposite phases despite the presence of the main main signal or the sub main signal, the combined output signal of the SD COMB board is canceled out and combined. An output decrease alarm will be output in the later AGC. However, whether or not there is a main main signal and a sub main signal is determined by the conventional SD CO.
Since it is not possible to discriminate on the MB board, there is no main main signal and sub main signal and an alarm is issued.
It is not possible to determine whether an alarm has been issued due to a failure of the COMB panel.

The present invention has been made in view of the above points, and an object of the present invention is to provide an SD COMB panel capable of detecting whether a line abnormality or a device abnormality has occurred and notifying the user of the abnormality.

[0022]

FIG. 1 is a diagram illustrating the principle of the present invention. According to FIG. 1, the SD COMB board includes a first signal distributor 24 # 0 that branches an input first signal into second and third signals, and a phase of a fourth signal input based on a control signal. And a phase shifter 26 that outputs a fifth signal by adjusting
Second signal distributor 24 for splitting the signal into sixth and seventh signals
# 1, the first AGC amplifier 28 # 0 that controls the gain so that the amplitude is constant and outputs the eighth signal, and the second AGC amplifier 28 # 1 that controls the gain so that the amplitude is constant and outputs the ninth signal And a phase comparison mixer 30 that multiplies the eighth and ninth signals to output a phase comparison result signal indicating a phase difference between the eighth signal and the ninth signal.

Further, the SD COMB board determines whether the phase of the fourth signal is advanced, the phase of the fourth signal is delayed, or the phase of the fourth signal is not rotated according to the phase comparison result signal. A control circuit 32 that outputs a control signal, a signal synthesizer 34 that synthesizes the third signal and the seventh signal to output a synthesized signal, and a first detection that outputs a first detection signal indicating the presence or absence of the first signal. A circuit 36 # 0 and a second detection circuit 36 # 1 that outputs a second detection signal indicating the presence or absence of a fourth signal
And a third detection circuit 38 for detecting a device abnormality and an input signal abnormality based on the phase comparison result signal, the first detection signal, and the second detection signal, and based on a detection result of the third detection circuit 38,
Alarm means 40 for displaying a device abnormality or an input signal abnormality.

According to the above configuration, the phase comparison mixer 30 multiplies the eighth signal as the output signal of the first AGC amplifier 28 # 0 by the ninth signal as the output signal of the second AGC amplifier 28 # 1. Then, a phase comparison result signal indicating the phase difference between the eighth signal and the ninth signal is output. Here, when at least one of the first signal and the fourth signal is absent, the amplitude of at least one of the eighth signal and the ninth signal becomes zero, and the phase comparison mixer 30 8th
Since the signal and the ninth signal are multiplied, the phase comparison result signal has a constant signal level regardless of the presence or absence of the other signal.

First detection circuit 36 # 0 and second detection circuit 3
6 # 1 detects the presence or absence of the first signal and the fourth signal, and outputs the first and second detection signals. Third detection circuit 3
8 detects a device abnormality or an input signal abnormality according to the phase comparison result signal, the first detection signal, and the second detection signal. The alarm means 40 displays a device abnormality or an input signal abnormality.

[0026]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment FIG. 2 is a block diagram showing an embodiment of a multiplex radio apparatus according to the present invention. As shown in FIG.
# 0, 50 # 1, a receiving board 51, an SD COMB board 54 and a demodulating board 56 are provided. The antenna 50 # 0 is a main antenna for receiving a main main signal,
# 1 is a sub-antenna for receiving a sub-main signal. The antennas 50 # 0 and 50 # 1 are spaced apart from each other by a certain distance or more in order to avoid level degradation due to multipath fading or the like.

The receiving board 51 includes a main-side receiving circuit 52 # 0
And a sub-side receiving circuit 52 # 1. The main-side receiving circuit 52 # 0 receives a high-frequency signal in a wireless band (for example, C band: 4 to 8 GHz) from a received signal of the main antenna 50 # 0, performs waveform shaping, and performs intermediate frequency (for example, 140M).
Hz) and AGC control (for example, -10
To −40 dBm) to change the main main signal to SD CO
Output to the MB board 54. The sub-side receiving circuit 52 # 1 performs the same process as that of the main-side receiving circuit 52 # 0 on the received signal of the sub-antenna 50 # 1, and
Output to the COMB board 54.

FIG. 3 is a diagram showing an SD according to the first embodiment of the present invention.
FIG. 9 is a configuration diagram of a COMB board, wherein substantially the same components as those in FIG. 8 are denoted by the same reference numerals. FIG.
8 differs from the SD COMB board of FIG. 8 in that a means for detecting and reporting a line / device abnormality is provided.

The main-side amplifier 70 # 0 is a fixed amplifier for amplifying the main input main signal with a fixed gain and determining the presence or absence of the main main signal. Sub side amplifier 70 # 1
Is a fixed amplifier for amplifying the sub input main signal with a fixed gain and determining the presence or absence of the sub main signal. The amplification is performed because the input main signal is a very small signal of -10 to -40 dBm.

The reason why the gain is fixed is that, in principle, the main main signal and the sub main signal are determined by the presence or absence of the output signals of the main-side phase detection AGC amplifier 8 # 0 and the sub-side phase detection AGC amplifier 8 # 1. It is also possible to determine the presence or absence of the input, but if there is no main main signal and sub main signal,
This is because abnormal oscillation may occur due to a device abnormality of the AGC amplifiers 8 # 0 and 8 # 1. AGC amplifier 8 # 0,8
It is considered that the cause of the abnormal oscillation of # 1 is that the oscillation becomes easy due to the weak ground portion or the jump of the unnecessary wave.

The main detector 72 # 0 detects the output signal of the main amplifier 70 # 0 and obtains the amplitude of the main main signal. The sub-side detector 72 # 1 is connected to the sub-side amplifier 70
The output signal of # 1 is detected to determine the amplitude of the sub main signal. The main-side comparator 74 # 0 includes a reference voltage serving as a threshold for determining the presence or absence of a main main signal and the main-side detector 7
By comparing the output voltage of 2 # 0, a signal indicating the presence / absence of the main main signal, for example, if the reference voltage> the output voltage of the main-side detector 72 # 0, output '1' and reference voltage ≦ main-side If it is the output voltage of the detector 72 # 0, it outputs '0'.
Similarly, the sub-side comparator 74 # 1 compares the reference voltage with the output voltage of the sub-side detector 72 # 1, and outputs "1" if the reference voltage> the output voltage of the sub-side detector 72 # 1. If the reference voltage ≦ the output voltage of the sub-side detector 72 # 1, '0' is output.

The line / equipment abnormality detection circuit 76 determines line / equipment abnormality from the output signal of the main-side comparator 74 # 0, the output signal of the sub-side comparator 74 # 1, and the 2-bit output signal of the window comparator 12. And a line error detection bit that indicates the presence or absence of a line / device error.
1 ', if the line is normal,' 0 ') and a device abnormality detection bit (' 1 'if the device is abnormal,' if the device is normal)
0 ').

FIG. 4 is a diagram showing the truth values of the line / device abnormality detection circuit 76 in FIG. FIG. 4 shows a signal indicating the presence or absence of a main main signal output from the main comparator 74 # 0, a signal indicating the presence or absence of a sub main signal output from the sub comparator 74 # 1, and output from the window comparator 12. 2 bits output, the state of the SD COMB panel 54, the presence / absence of a device alarm, and the presence / absence of a line alarm.

(1) When the main main signal is present, the sub main signal is present, and the window comparator output (0, 0) is in the in-phase combining state, the equipment and the line are in a normal state.

(2) In the case of a main main signal, a sub main signal, and a window comparator output (0, 1), E
PS2 is rotating in the advancing direction, and the equipment and line are in a normal state.

(3) When there is a main main signal, a sub main signal, and a window comparator output (1, 0),
PS2 is rotating in the delay direction, and the device and line are in a normal state.

(4) If there is a main main signal, no sub main signal, and the window comparator output (0, 0), E
The PS is stopped, the device is normal, but the line is abnormal (no sub-side signal).

(5) When there is no main main signal, there is a sub main signal, and when the window comparator output is (0, 0), E
PS2 is stopped and the device is normal, but the line is abnormal (no signal on the main side).

(6) With main main signal, without sub main signal, window comparator output (1, 0) or (0,
In the case of 1), the EPS is rotating, the equipment is abnormal (the EPS 2 is rotating without one input), and the line is abnormal (the sub-side signal is absent). The device abnormality is caused by the fact that the phase comparison mixer 10 multiplies the output signals of the AGC amplifiers 8 # 0 and 8 # 1, and if one or both of the signals have no signal, the phase comparison result voltage is located in the dead zone. This is because the output of the window comparator 12 must be (0, 0). One of the causes of device abnormality is AGC for phase detection.
Abnormal oscillation of the amplifiers 8 # 0 and 8 # 1 is considered.

(7) No main main signal, sub main signal present, window comparator output (1, 0) or (0,
In the case of 1), the EPS is rotating, the equipment is abnormal (the EPS 2 is rotating without one input), and the line is abnormal (the main-side signal is absent). The device abnormality is the same as in the case (6).

(8) In the case of no main main signal, no sub main signal, and window comparator output (0, 0),
PS2 stopped, equipment normal, line abnormal (main,
No sub-side signal).

(9) No main main signal, no sub main signal, window comparator output (1, 0) or (0,
In the case of 1), the EPS is rotating, the equipment is abnormal (the EPS 2 is rotating without both inputs), and the line is abnormal (main,
No sub-side signal). (6)
Is the same as

FIG. 5 is a perspective view of the SD COMB board 54 of FIG. As shown in FIG. 5, a line abnormality output LED
78 and the device abnormality output LED 80 are provided by SD CO so that a third party can be notified of the line abnormality / device abnormality.
It is attached to the outer surface of the MB board 54. The line abnormality output LED 78 is an LE for indicating the presence or absence of a line abnormality.
D (for example, a red LED), lights up when the line abnormality detection bit is “1”, and sets the line abnormality detection bit to “1”.
Turns off when 0 '. LED 80 for device error output
Is an LED (for example, a red LED) for indicating the presence or absence of a device abnormality. The LED is turned on when the device abnormality detection bit is “1”, and is turned off when the device abnormality detection bit is “0”.

The operation of the multiplex radio apparatus shown in FIG. 2 will be described below.

The main-side antenna 50 # 0 and the sub-side antenna 50 # 1 receive radio waves transmitted from the multiplex radio apparatus on the transmission side, and receive signals are received by the main-side reception circuits 52 # 0 and 52 # 0 in the reception board 51. Output to the sub-side receiving circuit 52 # 1. The main-side receiving circuit 52 # 0 and the sub-side receiving circuit 52 # 1 receive a signal in the radio band (8C band of the 4 to 8 GHz band) of the multiplex radio apparatus from the received signal, shape the waveform, and adjust the frequency to the intermediate frequency. By performing conversion and AGC control, for example, an intermediate frequency of 140 MHz, power of -10
The main main signal and the sub main signal in the range of −40 dBm are represented by S
It outputs to the D COMB board 54.

The main main signal is input to HYB4 # 0 and main-side amplifier 70 # 0 in FIG. The sub main signal is input to EPS2 and sub amplifier 70 # 1 in FIG. HYB4 # 0 branches the main main signal into two,
Output to the main-side phase detection AGC amplifier 8 # 0 and HYB6. The main-side phase detection amplifier 8 # 0 controls the main main signal so that the amplitude becomes constant (for example, -4 dBm). The EPS 2 rotates the phase of the sub-input main signal according to the -6V to 6V EPS control signal input to the SIN terminal and the COS terminal.

The HYB 4 # 1 splits the sub main signal into two and outputs the sub side phase detection AGC amplifier 8 # 10 and the HYB
6 is output. The sub-side phase detection amplifier 8 # 1 controls the sub main signal so that the amplitude is constant (for example, -4 dBm). The phase comparison mixer 10 includes an AGC amplifier 8 #
The output signals of 0, 8 # 1 are multiplied to output a phase comparison result voltage indicating a phase difference within a range of 0 to 5V. As shown in FIG. 9, the window comparator 12 is (0, 1) when the phase comparison result voltage is 0 to 2.3 V, and (0, 1) when the phase comparison result voltage is 2.3 to 2.7 V. , 0), when the phase comparison result voltage is 2.7 V to 5 V, (1, 0) is output.

The counter 14 is provided in the window comparator 1
According to the two output bits, one of down-counting, up-counting, and no counting is performed. The D / A converter 20 converts the output of the counter 14 into a voltage in a range of 0 to 5V. The EPS phase monitor 22 positions the needle meter at an angle corresponding to the input voltage within the range of 0 ° to 360 °.

The ROM 16 outputs a 2 × 8-bit phase rotation amount using the output signal of the counter 14 as an address. The D / A converter 18 converts the signal of 2 × 8 bits into −6
Two EPS control signals within a range of V to +6 V
Output to the SIN terminal and COS terminal. EPS2 is
In accordance with the EPS control signal, the sub main signal is rotated in phase and output to HYB6 through HYB4 # 1.

The HYB 6 synthesizes the main main signal and the sub-main signal whose phase has been rotated. The combined main signal is subjected to AGC control by an AGC amplifier (not shown),
Output to the middle demodulation board 56. At this time, AG (not shown)
The C amplifier outputs an alarm when the amplitude of the combined main signal is equal to or smaller than the threshold.

On the other hand, the main amplifier 70 # 0 and the sub amplifier 70 # 1 amplify the main main signal and the sub main signal with a fixed gain. The main-side detector 72 # 0 and the sub-side detector 72 # 1 perform envelope detection of the main main signal and the sub-main signal amplified by the main-side amplifier 70 # 0 and the sub-side amplifier 70 # 1, and adjust the amplitude. Output. The main-side comparator 74 # 0 and the sub-side comparator 74 # 1 compare the amplitude of the main main signal and the sub-main signal with the reference voltage, and output “0” if amplitude ≧ reference voltage, and output amplitude < If it is a reference voltage, '1' is output.

The line / equipment abnormality detection circuit 76 detects the logical level of the output bit of the main comparator 74 # 0, the sub comparator 74 # 1, and the window comparator 12 as shown in FIG.
According to the truth values shown in (1), if the line is abnormal, the line abnormality detection bit = '1', if the line is normal, the line abnormality detection bit = '0', and if the device is abnormal, the device abnormality detection bit = '1'', The device abnormality detection bit =' 0 'is output.

The line abnormality output LED 78 is turned on when the line abnormality detection bit is "1", and is turned off when the line abnormality detection bit is "0". LED for device error output 80
Turns on when the device abnormality detection bit = '1', and turns off when the device abnormality detection bit = '0'. If the line abnormality output LED 78 is lit, the maintenance person or the like checks the line system such as the receiver 51 and replaces the unit. If the device abnormality output LED 80 is lit, the unit of the SD COMB panel 54 is replaced.

As a result, a maintenance person or the like can be notified of a device abnormality or a line abnormality. Further, even if the needle meter of the EPS 2 flaps, it does not indicate a device abnormality, so that it is possible to prevent a third party from misunderstanding that the device is abnormal. Further, if the SD COMB board 54 fails and the signal is synthesized in the opposite phase and an alarm indicating that there is no synthesized signal is output even though the main and sub-side circuits are normal, the device may be abnormal. I understand. A signal indicating the presence / absence of a combined signal is also input to the line / device abnormality detection circuit 76. If both the main and sub main signals have a signal and the combined signal has no signal, the device abnormality detection bit is set to “1”. May be.

Second Embodiment FIG. 6 is a block diagram of an SD COMB board according to a second embodiment of the present invention. Components that are substantially the same as the components in FIG. I have. 6 is different from the SD COMB panel 54 of FIG. 3 in that a main main signal disconnection output LED 82 # 0 and a sub main signal disconnection output LED 82 # 0 are provided so that the main main signal disconnection and the sub main signal This is to notify the disconnection.

FIG. 7 is a perspective view of the SD COMB board 81 of FIG. The main main signal disconnection output LED 82 # 0 and the sub main signal disconnection output LED 82 # 1 are connected to the line abnormality output LED 78 and the device abnormality output LED 80 along with the SD.
It is attached to the outer surface of the COMB board 81.

The main main signal disconnection output LED 74 # 0 and the sub main signal disconnection output LED 74 # 1 include a main main signal disconnection bit which is an output signal of the main side comparator 74 # 0 and the sub side comparator 74 # 1. Lights when the sub main signal disconnection bit is “1”, and turns off when the main main signal disconnection bit and the sub main signal disconnection bit are “0”.
This makes it possible to determine whether the main main signal has been lost or the sub main signal has been lost in the case of a line abnormality, so that it is possible to deal with the problem more quickly.

[0058]

As described above, according to the present invention,
Since a line abnormality or a device abnormality can be notified, it is possible to deal with the problem more accurately.

[Brief description of the drawings]

FIG. 1 is a principle diagram of the present invention.

FIG. 2 is an embodiment diagram of a multiplex radio apparatus of the present invention.

FIG. 3 is a configuration diagram of an SD COMB board according to the first embodiment of the present invention.

FIG. 4 is a diagram showing truth values of the line / device abnormality detection circuit in FIG. 3;

FIG. 5 is a perspective view of the SD COMB board of FIG. 3;

FIG. 6 is a configuration diagram of an SD COMB board according to a second embodiment of the present invention.

FIG. 7 is a perspective view of the SD COMB board of FIG. 6;

FIG. 8 is a configuration diagram of a conventional SD COMB board.

FIG. 9 is a diagram illustrating a relationship between a phase comparison result voltage and EPS phase control.

FIG. 10 is a perspective view of the EPS phase monitor in FIG. 8;

[Explanation of symbols]

 24 # 0 first signal distributor 24 # 1 second signal distributor 26 phase shifter 28 # 0 first AGC amplifier 28 # 1 second AGC amplifier 30 phase comparison mixer 32 control circuit 34 signal synthesizer 36 # 0 first detection Circuit 36 # 1 Second detection circuit 38 Third detection circuit 40 Alarm means

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shingo Sakamoto 1-2-2, Ichibancho, Aoba-ku, Sendai, Miyagi Prefecture Inside Fujitsu Tohoku Digital Technology Co., Ltd. (72) Inventor Koichi Hayasaka Aoba, Sendai, Miyagi 1-25-2, Ichibancho, Ward Fujitsu Tohoku Digital Technology Co., Ltd. F-term (reference) 5K059 CC03 DD35 DD41 EE02 5K061 AA10 CC02 CC05 CC25 CC45

Claims (4)

[Claims] A first signal distributor for dividing an input first signal into a second signal and a third signal; adjusting a phase of an input fourth signal based on a control signal to output a fifth signal; A second signal splitter that splits the fifth signal into sixth and seventh signals, and outputs the eighth signal by inputting the second signal and controlling the gain so that the amplitude becomes constant. A second AGC amplifier that inputs the sixth signal, controls the gain so that the amplitude becomes constant, and outputs a ninth signal, and multiplies the eighth and ninth signals to generate the eighth signal. A phase comparison mixer that outputs a phase comparison result signal indicating a phase difference between the signal and the ninth signal; a phase advancer for the fourth signal according to the phase comparison result signal; a delay for the phase of the fourth signal; The fourth
A control circuit that outputs the control signal by determining whether to rotate the phase of the signal or not, a signal combiner that combines the third signal and the seventh signal and outputs a combined signal, A first signal for outputting a first detection signal indicating the presence or absence of the first signal;
A detection circuit, and a second output circuit that outputs a second detection signal indicating the presence or absence of the fourth signal.
A detection circuit, the phase comparison result signal, the first detection signal, and the second
A third detection circuit that detects a device abnormality and an input signal abnormality based on a detection signal; and an alarm unit that displays the device abnormality or the input signal abnormality based on a detection result of the third detection circuit. Space Diversity In-Phase Synthesis Board 2. The third detection circuit, wherein at least one of the first detection signal and the second detection signal indicates that there is no signal, and the phase comparison result signal is at least one of the eighth and ninth signals. 2. The space diversity in-phase composite board according to claim 1, wherein the apparatus is determined to be abnormal if the signal level is not a signal output when no signal is present. 3. The third detection circuit determines that the input signal is abnormal when at least one of the first detection signal and the second detection signal indicates no signal. Item 3. A space diversity in-phase composite board according to item 1. 4. When the first detection signal and the second detection signal indicate that a signal is present and the composite signal is absent,
The space diversity in-phase composite board according to claim 1, further comprising a fourth detection circuit that determines that the apparatus is abnormal.