JPS62160826A - Transmitter of set standby system - Google Patents

Abstract

PURPOSE:To prevent the deterioration in the line quality at a fault of a switch control circuit by turning off any of high frequency switches when a transmission output exceeds a setting value. CONSTITUTION:In removing a high frequency switch control circuit 2 at a fault or a mis-operation, the high frequency switches 3a, 3b are turned on, each transmission signal from active/standby transmitters 1a/1b is synthesized and the level is increased. The level increase is detected by a power detector 4a, an initiator 5 senses the rise of an output power by the DC voltage of the detection output and when the power exceeds a setting value, a transistor 6 is turned on. Thus, a relay 7 is activated and a voltage V is supplied and the standby high frequency switch 3b is turned off. Then the transmission is executed from the active transmitter 1a only.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a transmitter using a set backup method in which a backup set is arranged in parallel with a working set and the outputs of both sets are switched. The present invention relates to a set reserve type transmitter in microwave communication equipment and the like.

[Conventional technology]

Conventionally, in order to improve the reliability of the communication line, transmitters using the set backup method detect failures in the working transmitter by some method, and switch to the backup transmitter in the event of failure to prevent communication interruption.

Since this switching needs to be performed in the radio frequency band downstream of the transmitter output, a high frequency switch is attached to each transmitter output end, and a control circuit is provided to control these high frequency switches.

For example, as shown in FIG. 2, the output ends of the working transmitter 1a and the backup transmitter 1b are connected to a high frequency switch 3a for the working machine and a high frequency switch 3b for the backup machine, respectively, The output end of 3b is connected to a communication line via a T-branch 8. The high frequency switch control circuit 2 selects and turns on one high frequency switch among the high frequency switches 3a and 3b connected to each transmitter 1a and lb, and turns off the others.
1゜ [Problem to be solved by the invention] The conventional set reserve method transmitter described above is
The output ends of the transmitter 1la and the backup transmitter 1b are connected to a high frequency switch 3a for the active machine and a high frequency switch 3b for the backup machine, respectively, and both high frequency switches 3a, 3
The output terminals of B are connected by a T-branch 8, and if the control circuit 2 of the high frequency switch malfunctions or there is a malfunction, K
When the transmitter 1a and the standby transmitter 1b are removed from each other, the respective transmission signals from the working transmitter 1a and the standby transmitter 1b are transmitted to the respective high frequency switches 3a.

3b and is output to the T branch 8, thereby preventing the line from being disconnected.

Both the transmission signals from the active transmitter 1a and the backup transmission @ib will be combined and output at the T-branch 8, but in this case, if there is not a sufficient level difference between the two transmission signals, a line failure will occur. It is K to give. In other words, if the transmission signals are combined at the same level, the frequencies of both transmission signals will necessarily differ, albeit slightly, resulting in deterioration of line quality.

As such, conventional set backup transmitters have the disadvantage that line quality deteriorates if the high frequency switch control circuit fails or if the control circuit is removed due to erroneous operation.

The purpose of the present invention is to prevent the high-frequency switch control circuit from failing or being removed due to incorrect operation.
An object of the present invention is to provide a set reserve type transmitter that does not degrade line quality. .

[Failure to solve the problem]

The set backup type transmitter according to the present invention has a backup transmitter installed in parallel with the active transmitter, high-frequency switches each on the transmission output side, and a control circuit for these high-frequency switches. In the transmitter of the set standby method in which one of the high frequency switches is turned on, the transmitter includes means for detecting the transmission output, and a means for detecting the transmission output of the high frequency switch when the detected transmission output exceeds a set value. Since the transmitter is characterized by a means for turning off any one of the high-frequency switch control circuits, even if the above-mentioned high-frequency switch control circuit breaks down or is removed due to erroneous operation, the working transmitter and the spare Since both transmitted signals from the transmitter are never combined,
Deterioration of line quality can be prevented.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment according to the present invention. As shown in FIG. 1, the output ends of the working transmitter 1a and the backup transmitter 1b are connected to a high frequency switch 3a for the working machine and a high frequency switch 3b for the backup machine, respectively, and both high frequency switches 3a, The output end of 3b is T branch 8
are combined with.

The control circuit 2 of the high frequency switch has a high frequency switch f 3a
, 3b (F) are connected to the respective high frequency switches 3a, 3b in order to control one to turn on and the other to turn off. In addition, the high frequency switches 3a and 3b are as follows:
When turned off, it terminates the transmitted signal.

Connected between the control circuit 2 and the standby high-frequency switch 3b is a switching relay contact 7b, which will be described later.This relay contact 7b connects the high-frequency switch 3b to the control circuit 2, or This is for selecting which one to connect to.

The respective outputs of the working transmitter 1a and the standby transmitter 1b are branched and input to each power detector 4a, 4b K.

Each power detector 4a, 4b is connected to each initiator 5a, 5
It is connected to the control circuit 2 via b. Each initiator 5a, 5b detects a drop in the level of the DC voltage output from each power detector 4a, 4b.

The initiator 5 is connected to, for example, a power detector 4a on the side of the working transmitter la, and detects a rise in the level of the DC voltage that is the output of the power detector 4a. .

The output end of the initiator 5 is connected to the base of a transistor 6 via a resistor 10, and is also connected to a reset switch 9 via the resistors 10 and 11 and the first relay contact 7a. . Note that the switch 9 is manually operated and the normally open relay contact 7a is normally connected to the voltage (-
V).

The emitter of the transistor 6 is grounded, and the collector is connected to a voltage (-■) via a relay 7.

The relay 7 is a two-circuit type relay, and when it is turned on (energized), the - circuit operates the second relay contact 7b to supply the voltage V that turns off the high frequency switch 3b for the standby machine, and the other One circuit operates the first relay contact 7a to fix the transistor 6 in the on state as described below.

Next, the operation shown in FIG. 1 will be explained. Normally, the two transmission signals sent from the working transmitter 1a and the backup transmitter 1b are:
High frequency switch 3a for active machine or high frequency switch 3b for standby machine selected by high frequency switch control circuit 2
One of the two transmission signals is selected at , and output via T-branch 8 . In addition, the high frequency switches 3a and 3b
is turned off, the transmitted signal is terminated.

If the high frequency switch control circuit 2 breaks down or is removed from K due to an erroneous operation, both high frequency switches 3a and 3b are turned on, so the two transmitted signals are combined and the level increases. rises -1
This level increase is detected by the power detector 4a, and the initiator 5 senses the increase in output power based on the DC' voltage of the detected output, and turns on the transistor 6 when the output power exceeds a set value.

When the transistor 60 is turned on, the relay 7 is operated, the second relay contact 7b is switched, voltage V is supplied, the standby Takaoka Isao switch 3b is turned off, and the first relay contact 7a is turned on. At the voltage (-V), the transistor 6 is fixed in the on state.

Next, after a normal control circuit 2 is installed, in order to switch to control by the high frequency switch control circuit 2, the reset switch 9 is manually turned off and then turned on again. It can be turned off and returned to normal operating conditions as shown in FIG.

In this way, in this embodiment, when the control circuit 2 fails or is removed due to an erroneous operation, the initiator 5 senses an increase in the output power, and when the output power exceeds the set value, the high frequency Since the switch 3b is turned off, only the transmission signal from the working transmitter 1a is sent out, so there is no deterioration in line quality.

Note that the power detector 4a constitutes means for detecting the transmission output, and the initiator 5, transistor 6, relay 7, relay contacts 7a, 7b, etc. It constitutes a means for turning off any one of the high frequency switches.

〔Effect of the invention〕

As explained above, the present invention prevents the transmission signals of both the working transmitter and the standby transmitter from passing through the respective high-frequency switches when the high-frequency switch control circuit fails or is removed due to malfunction. This has the effect of not degrading the line quality.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention, and FIG.
The figure is a block diagram showing a conventional example. 1a....... Working transmitter 1b...
・・・・・・・・・Spare transmitter 2・・・・・・・・・
...Control circuit 3a...High frequency switch 3b for active machine...High frequency switch 4a, 4b for standby machine Power detection Initiators 5a, 5b for detecting a level rise...Initiator 6 for detecting a level drop...Transistor 7...・・・・・・・・・ Relay -7a, 7b...Relay contact 8 ・・・・・・・・・・・・T Branch 9
・・・・・・・・・Reset switch 10, 11
・・・・・・Resistance patent applicant Nissho Electric Forest Co., Ltd. ゛・−Core・′

Claims (1)

[Claims] A standby transmitter is arranged in parallel with the active transmitter, and a high frequency switch is arranged on each of these transmission output sides,
Furthermore, in a set backup type transmitter which is provided with a control circuit for these high frequency switches and turns on any one of the high frequency switches, means for detecting the transmission output, and the detected transmission output is set to a set value. and means for turning off any one of the high-frequency switches when the frequency exceeds the set-preparation type transmitter.