JPS6423630A - Demodulator for satellite communication - Google Patents
Demodulator for satellite communicationInfo
- Publication number
- JPS6423630A JPS6423630A JP17949387A JP17949387A JPS6423630A JP S6423630 A JPS6423630 A JP S6423630A JP 17949387 A JP17949387 A JP 17949387A JP 17949387 A JP17949387 A JP 17949387A JP S6423630 A JPS6423630 A JP S6423630A
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- sweeping
- circuit
- locking
- vco
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Abstract
PURPOSE:To make time required for re-locking a sub-synchronous carrier reproducing circuit shorter when the locking of the circuit is stepped-out, by causing sweeping by means of a sweeping circuit to be started after the sweeping starting point is set at the minimum or maximum frequency of a voltage-controlled oscillator (VCO) by resetting the counter of the sweeping circuit only. CONSTITUTION:When the carrier frequency changes from fc to fc' due to the relative movement of a geostationary satellite and the locking state is stepped- out, a counter 71 starts counting after it is reset and the sweeping by means of a sweeping circuit 7 is started from a frequency fVMIN in the vicinity of the minimum frequency fVMIN or a frequency fVMAX in the vicinity of the maximum frequency fVMAX of a voltage controlled oscillator (VCO) 8 as shown by the solid line or chain line. Then the sweeping is carried out in the direction, in which the frequency of the VCO 8 is successively raised or lowered. Therefore, the locking frequency fc can be searched in a short period.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17949387A JPS6423630A (en) | 1987-07-17 | 1987-07-17 | Demodulator for satellite communication |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17949387A JPS6423630A (en) | 1987-07-17 | 1987-07-17 | Demodulator for satellite communication |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6423630A true JPS6423630A (en) | 1989-01-26 |
Family
ID=16066788
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP17949387A Pending JPS6423630A (en) | 1987-07-17 | 1987-07-17 | Demodulator for satellite communication |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6423630A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH05191216A (en) * | 1992-01-10 | 1993-07-30 | Nec Corp | Sweep range control system |
JPH05211424A (en) * | 1992-01-30 | 1993-08-20 | Nec Corp | Frequency sweep range controller |
JP2006284539A (en) * | 2005-04-05 | 2006-10-19 | Teraoka Seiko Co Ltd | Load cell and balance |
-
1987
- 1987-07-17 JP JP17949387A patent/JPS6423630A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH05191216A (en) * | 1992-01-10 | 1993-07-30 | Nec Corp | Sweep range control system |
JPH05211424A (en) * | 1992-01-30 | 1993-08-20 | Nec Corp | Frequency sweep range controller |
JP2006284539A (en) * | 2005-04-05 | 2006-10-19 | Teraoka Seiko Co Ltd | Load cell and balance |
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