| 摘要 |
PURPOSE:To expand a reception service area by scattering plural small-sized UHF transmitters in the reception area, linking them a wire means and transmitting a signal from a main transmitter. CONSTITUTION:Under the connection of a transmission line 5, plural sub- transmitters B composed of a high frequency transmitter 3 and a transmission antenna 3 are spirally installed approximately by the same interval in the vicinity of the main transmitter A with said transmitter A as a center. These sub- transmitters B receive video signals transmitted from the main transmitter A at the center, and transmit them after the transmitter 3 converts them into a high frequency signal. Namely, the aerial output of a transmitter 2 is weak and nondirectional equivalent to a weak radio wave in the Radio Wave Act, and the transmission line 5 causes the transmission wave from the main transmitter A in the received state. Then all higher harmonic transmission channel frequencies of the main transmitter A and sub-transmitter B are set to the same channel, whereby the output can be freely received at a receiver installation position in the reception service area. Thus the reception service area can be expanded.
|
