| 摘要 |
PURPOSE:To make it possible to expand a signal receiving service area by installing in the signal receiving area the high frequency transmission cable, from which a weak electric wave leaks, and sending a high frequency signal from the transmitter to the cable. CONSTITUTION:The high frequency leak cable is installed surrounding transmitter A like scrolls and at an equal distance between cables. To this high frequency cable 3, a high frequency signal is agent from transmitter 2, and weak high frequency antenna output is discharged from the entire area of cable 3. That is, the antenna output from transmitter 2 is the non-directional output as weak as the weak electromagnetic wave regulated by the electromagnetic wave, and if the receiving area after installing the high frequency transmission covers an area with a diameter of 1km, when the cable is installed coaxially so that the first coaxial circle is situated surrounding the central main transmitter A and 200m distant from the center of the transmitter, and so that the second coaxial circle is situated 40cm distance therefrom, thereby enabling this system to carry out receiving service freely at the place of installing the picture receiving device in the signal receiving service area. With this, the equipment cost can be radically reduced compared with the cost of installation and operation of CATV or broad range radio station.
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