Title:
EARTH STATION RECEIVER
Document Type and Number:
Japanese Patent JP3042083
Kind Code:
B2
Abstract:
PURPOSE: To allow the receiver to cope with frequency fluctuation of a communication satellite main body without expanding a lock range of an AFC over a maximum value of the frequency fluctuation of the communication satellite main body and without provision of an exclusive AFC.
CONSTITUTION: A sweep control section 7 changes largely a sweep voltage Vs so that an oscillation signal Sv sweeps voltages in excess of the maximum value of frequency fluctuation of a communication satellite at the start of operation. The sweeping is stopped when a synchronization detection section 6 detects that a system pilot signal inserted by the communication satellite and an oscillation signal Sv are synchronized and the sweep voltage Vs at sweep stop is stored in a memory section 9. Then the sweep control section 7 changes the sweep voltage Vs slightly around the sweep voltage stored in the memory section 9 at the sweep stop and stops the sweeping when the synchronization detection section 6 detects the synchronization between the desired signal and the oscillation signal Sv.
Inventors:
Fumiaki Suzuki
Application Number:
JP26438591A
Publication Date:
May 15, 2000
Filing Date:
October 14, 1991
Export Citation:
Assignee:
NEC
International Classes:
H04B7/155; (IPC1-7): H04B7/155
Domestic Patent References:
| JP63178642A | ||||
| JP57115747U |
Attorney, Agent or Firm:
Naoki Kyomoto (2 outside)