JPS62263726A - Repeater - Google Patents

Abstract

PURPOSE:To relay two areas not to be relayed by one antenna by switching selectively antennas for transmission/reception use arranged in two areas in response to the state of the area. CONSTITUTION:When no radio wave is emitted from stations in areas (1), (2), the state that the antenna in one area is used for the reception and the antenna in the other area is used for the transmission antenna, and the opposite state are switched alternately. When an output of a prescribed level or over exists from a reception circuit 4, a switch changeover timing circuit 6 stops its oscillation by the output of a threshold detection circuit 5 and switches SW1, SW2 hold the connecting state. Thus, the state making transmission/reception from the area (1) to the area (2) or from the area (2) to the area (l) is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a repeater device, and particularly to a repeater device for relaying between two areas where relay cannot be performed with one antenna.

πPrior art and its problems" A repeater device is usually installed at the top of a mountain where there is a barrier above the radio wave shrine, such as a high mountain, and relays both areas, using one antenna. It is used for both sending and receiving purposes. However, if, for example, one area is above ground and the other area is underground, it is impossible to relay both areas with a single antenna.

"Purpose of the Invention" The second invention is a self-proposed proposal based on the above-mentioned conventional problem, and its purpose is to obtain a repeater device that can relay between two areas that cannot be relayed with one antenna. It is something.

"Structure of the Invention" In order to achieve the above object, the present invention employs the following means. That is, for example, prepare two antennas to be installed in each of two areas such as above ground and underground where it is impossible to relay to each other with a single antenna, and install the following between these antennas and the receiving circuit and transmitting circuit. A switch means controlled by the control means is provided, and the switch means is used to change the state in which the antenna in one area is used for reception and the antenna in the other area is used for transmission, and vice versa. The switching control is performed as follows.

The control means maintains the state of the switch means so that the received radio waves can be continuously received when there is an output from the receiving circuit, and when there is no output from the receiving circuit, the state of the switch means is maintained until there is a transmission from a station in any area. The state of the means is periodically switched between the above two states. For this purpose, a threshold detection circuit for detecting the output of the receiving circuit and a switch switching timing circuit for determining the operating state of the switch based on the state of the output of the threshold detection circuit are provided.

"Example" FIG. 1 shows an embodiment of the present invention.

Area ■ and area ■ are areas that cannot be seen from each other, such as above ground and underground. An antenna 1.2 is arranged in each of the two areas; The signal is input to the selection terminal of each of the switches SW, , SW2. A fixed terminal of the switch SW is connected to an output terminal of the transmitting circuit 3, and a fixed terminal of the switch SW2 is connected to an input terminal of the receiving circuit 4. As a result, the received signal input from the switch SW2 is transmitted to the receiving circuit 4.
After being detected by the transmitting circuit 3, the signal is frequency-converted to match the reception frequency of the other station, and at the same time, the level is appropriately adjusted and output to the switch SW.

The output of the receiving circuit 4 is also input to a threshold detection circuit 5, and the output of this threshold detection circuit 5 is further input to a switch timing circuit 6 that controls the two switches sw, , sw2. As a result, when there is only an output below a certain level from the receiving circuit 4, that is, when the output is about the noise level, the threshold detection circuit 5 operates an oscillator (not shown) in the switch timing circuit 6 to generate a predetermined frequency. (for example, about 100 Hz) to each of the switches SW.

Output to SW2. When one of the selection terminals of the switches sw, sw2 is connected to antenna 1, the other is connected to antenna 2, and when one of the selection terminals of switch sw2 is connected to antenna 2, the other is connected to antenna 1.
The frequency can be switched at a cycle corresponding to the above-mentioned frequency. That is, area ■,
■When radio waves are not being emitted from any station in either area, the antenna in one area is used for reception, the antenna in the other area is used for transmission, and vice versa. A state is formed.

On the other hand, when there is an output of a certain level or higher from the receiving circuit 4, that is, when the antenna 1 or 2 is receiving radio waves emitted from a station in either area, the output of the threshold detection circuit 5 causes the switch to be activated. The switching timing circuit 6 stops its oscillation, and switches SW I, S
W z maintains its connection state. In other words, assuming that a radio wave is emitted from a station in area ■,
Antenna 1 becomes a receiving antenna, and the received signal is input to the receiving circuit 4 via switch SW2, and then becomes a radio wave that matches the frequency of the station in area ■ via the transmission δ circuit 3 and switch SW1, and is transmitted from antenna 2. The state in which radio waves are emitted is maintained, and when radio waves are emitted from area (2), the opposite state is maintained.

This allows you to move from area ■ to area ■, or from area ■
A state is created in which transmission and reception can be performed from area (2) to area (2).

"Effects of the Invention" As explained above, the present invention selectively uses antennas arranged in two areas for transmitting and
Switch to reception, and when a radio wave is emitted from a station in one of the areas, the above switching operation is stopped,
Since the transmission/reception status between the two areas is maintained, there is an effect that two areas that cannot be relayed can be relayed using one antenna.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention. In the figure, 1.2... Antenna, 3... Receiving circuit, 4... Transmitting circuit, 5... Threshold detection circuit i, 6... Switch switching timing circuit, SW, SW2.
...Switch (switch means), ■, ■... area. Figure 1

Claims (2)

[Claims] (1) Antenna to be placed in each of the two areas that cannot be relayed to each other with a single antenna, and a switch connected between the transmitting circuit, the receiving circuit, and the above two antennas and controlled by the control means described below. and a control means for controlling the changeover switch so that the antenna in one area is used for reception and the antenna in the other area is used for transmission, and vice versa. (2) The control means includes a threshold detection circuit that detects the output level of the receiving circuit, and when the threshold detection circuit does not detect a predetermined level, alternately switches the switch means between the two states at a predetermined frequency. The repeater device according to claim 1, further comprising a switch timing circuit that stops the operation of the switch means when a predetermined level is detected.