Title:
DISTRIBUTION SYSTEM FOR SIGNAL TO BE TRANSMITTED BY ULTRASHORT WAVE
Document Type and Number:
Japanese Patent JPH04151990
Kind Code:
A
Abstract:
PURPOSE: To make the output frequency of a distribution system directly adjustable at a using spot by converting the frequency of signals from a satellite modulated to an intermediate frequency to the sum frequency of a fixed frequency higher than the frequency band of an output channel and a channel frequency after converting the frequency of the signals to the fixed frequency. CONSTITUTION: A first frequency converter 5 converts the frequency of signals transmitted from a satellite through microwaves after the signals are modulated by means of an intermediate-frequency modulator 3 to a fixed frequency F1 which is higher than the frequency band of an output channel. Then, after an intermediate-frequency filter 5 removes the frequencies lower that the frequency F1 , a second frequency converter 8 converts the frequency of the signals by means of a local oscillator 9 commanded from a PLL synthesizer 10. Then signals of the sum frequency of the fixed frequency F1 and a frequency F2 which is equal to a desired channel frequency are fetched through an output filter 11. Therefore, the output frequency of distribution system is adjusted directly at a using spot.
More Like This:
Inventors:
MATSUKUSU GIUSUTEI
ROORAN ANRI KERUJIERU
ROORAN ANRI KERUJIERU
Application Number:
JP40398890A
Publication Date:
May 25, 1992
Filing Date:
December 04, 1990
Export Citation:
Assignee:
EBIMU SA
International Classes:
H04B1/10; H04B7/15; H04H20/76; H04J3/04; H04N7/20; (IPC1-7): H04B1/10; H04B7/15; H04H1/00; H04H1/02; H04J3/04; H04N7/20
Domestic Patent References:
| JPS61126878A | 1986-06-14 |
Attorney, Agent or Firm:
Yoshio Kawaguchi (2 outside)