| 摘要 |
PROBLEM TO BE SOLVED: To minimize an interference between the internal and external antennas by connecting the external antenna to a base station outside a shielding box and connecting the internal antenna to a slave unit inside the shielding box respectively. SOLUTION: This device is composed of a number writing device 1 which is stored in a shielding box, an input device 2 such as a keyboard, a note type personal computer, etc., a connection cable 3 which secures connection between the device 1 and the computer 2, a connection cable 4 of a public circuit, a connection terminal 5 of the cable 4, an external antenna 6, a base station 7 which performs the public service, the antennas 8a and 8b of the station 7, a pole 9, etc., to which the station 7 is attached. The device 1 is connected to a station 7 via the antenna 6, a radio circuit and the antennas 8a and 8b and also connected to a management center via the public circuit. In such a constitution, the satisfactory isolation is secured between the antenna 6 and an internal antenna. |
