JPS632501B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention provides analog
This relates to a digital relay device.

In the past, only analog communication using microwaves was used, but recently digital communication is also being used.

If digital communication is to be performed, a digital relay device must be installed alongside the analog relay device.
Since the station building where analog repeaters are installed is generally built with the assumption that only analog repeaters will be installed, it is difficult to secure space for installing a new set of digital repeaters. Therefore, it becomes necessary to construct a new station building, which has the drawback of requiring a very large amount of equipment cost.

An object of the present invention is to use an existing analog repeater to install a digital repeater, and to easily add or remove analog repeaters or digital repeaters while making use of other lines or repeaters. To provide digital relay equipment.

The analog/digital combined relay device according to the present invention includes an antenna, a directional coupler with a shutter having an input terminal connected to the antenna and having a shutter for opening and closing a coupling hole, and a directional coupler with a shutter having an input terminal connected to the antenna. a main line with one end connected to a pass-through terminal, an analog repeater branch-connected in the middle of the main line, a digital repeater branch-connected to an end side of the main line, and the analog repeater and the digital A line switching device connected to the main line with a repeater, and a sub line connected between the coupling terminal of the directional coupler with shutter and the line switching device. It is something to do.

Embodiments of the present invention will be described in detail below with reference to FIGS. 1 and 2. The analog/digital combined relay device of this embodiment has an antenna 1 for both digital and analog use, and this antenna 1 is connected to an input terminal of a directional coupler 2 with a shutter. The directional coupler 2 with a shutter has a shutter 4 that opens and closes the coupling hole 3A of the 3dB directional coupler body 3.
It has a structure that has In this directional coupler with shutter 2, when the coupling hole 3A is closed with the shutter 4, the input signal enters from the input terminal and is output as is to the pass terminal without being distributed, and when the shutter 4 is opened, the input signal is output at the normal 3 dB. It operates as a directional coupler, and the input signal applied to the input terminal is divided into two and output to a pass terminal and a coupling terminal. A non-reflection terminator 5 is connected to the directional terminal of the directional coupler 2 with a shutter. One end of the main line 6 is connected to a passing terminal of the directional coupler 2 with a shutter. An analog repeater 7 is branch-connected in the middle of the main line 6. A digital repeater 8 is branch-connected to the end side of the main line 6. A non-reflection terminator 9 is connected to the end of the main line 6. A line switch 10 made of a waveguide switch is connected to the main line 6 between the analog repeater 7 and the digital repeater 8 by connecting its terminals a and b. Coupling terminal of directional coupler 2 with shutter and line switching device 10
A sub line 11 is connected between the terminal d and the terminal d. A non-reflection terminator 1 is connected to the terminal c of the line switch 10.
2 are connected.

Next, the state of use of such an analog/digital relay device in a receiving system will be explained. Normally, the coupling hole 3A of the directional coupler 2 with a shutter is used with the shutter 4 closed. In addition, the line switching device 10 is connected to a terminal a and a terminal b as shown by solid lines.
Use when connected to. In this state,
The signal received by the antenna 1 is input to the input terminal of the directional coupler 2 with shutter, and is directly output from the output terminal, and the input signal is sent to the analog repeater 7 and the digital repeater 8 via the main line 6. applied.

Under such conditions of use, lines may be disrupted when adding an analog repeater 7, or when removing an analog repeater 7 and dedicating it to a digital repeater 8. According to the invention, these operations can be performed without causing any trouble to the line by performing the following operations. That is, in this case, the directional coupler with shutter 2
Remove the shutter 4 and open the coupling hole 3A.
It is used as a 3 dB directional coupler, and the line switching device 10 is used by switching to connect terminals a and c, and connect terminals b and d, as shown by broken lines. In this way, antenna 1
The input signal received at Switcher 10
After being supplied to the digital repeater 8 through the terminals d and b of the , it is absorbed by the non-reflection terminator 9. In such a state, even if analog repeaters 7 are added or removed, there will be no problem with the line. When the work is completed, use the shutter 4 to open the coupling hole 3A.
, and return the line switching device 10 to the solid line connection state.

The addition of digital repeaters 8 can be carried out under normal usage conditions.

The same can be done for the transmission system.

Note that it goes without saying that the relay device includes not only intermediate stations but also terminal stations.

As explained above, in the analog/digital relay device according to the present invention, a part of the equipment is shared between the analog side and the digital side, so the equipment cost is reduced and installation space is easily secured, making it possible to It can be easily carried out by using some empty space in a building. Further, according to the present invention, analog repeaters and digital repeaters can be easily added or removed while keeping other lines and repeaters alive.

[Brief explanation of the drawing]

FIG. 1 is a system diagram showing an embodiment of an analog/digital relay device according to the present invention, and FIG. 2 is a perspective view showing an example of a directional coupler with a shutter used in the present invention. 1... Antenna, 2... Directional coupler with shutter, 3A... Coupling hole, 4... Shutter, 6... Main line, 7... Analog repeater, 8... Digital repeater,
10...Line switching device, 11...Sub-line.

Claims (1)

[Claims] 1. An antenna, a directional coupler with a shutter having a shutter for opening and closing a coupling hole and having an input terminal connected to the antenna, and a main line having one end connected to a passing terminal of the directional coupler with a shutter. , an analog repeater branch-connected in the middle of the main line, a digital repeater branch-connected to the terminal side of the main line, and a connection to the main line between the analog repeater and the digital repeater. What is claimed is: 1. An analog/digital combined repeater comprising: a line switching device with a shutter, and a sub line connected between a coupling terminal of the directional coupler with shutter and the line switching device.