| 摘要 |
PURPOSE: A bridge box for radio antennas is provided to cut material expenses, to prevent the signal loss of valid data, and to ensure exactness and reliability in data reception by installing a radio bridge box near an outdoor type LAN antenna and minimizing the connection length of an LMR(Land Mobile Radio) cable connected between a bridge and a radio antenna. CONSTITUTION: As a box(30) containing a bridge is coupled and fixed to an antenna support bar(46) so as to be close to an external antenna, such as a non-directional antenna, a directional antenna, a plane antenna, etc., the length of an LMR cable, connected between the external and the bridge, shortens. When the connection length of a UTP cable comparatively lengthens as the length of the LMR cable shortens, signal extinction is minimized as a matter of the characteristics of the UTP cable.
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