JPS5485626A - Switching diversity type direct-shift repeating installation - Google Patents
Switching diversity type direct-shift repeating installationInfo
- Publication number
- JPS5485626A JPS5485626A JP15391577A JP15391577A JPS5485626A JP S5485626 A JPS5485626 A JP S5485626A JP 15391577 A JP15391577 A JP 15391577A JP 15391577 A JP15391577 A JP 15391577A JP S5485626 A JPS5485626 A JP S5485626A
- Authority
- JP
- Japan
- Prior art keywords
- circulator
- reception
- output
- amplifier
- comparator
- 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
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
- H04B7/0802—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection
- H04B7/0817—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection with multiple receivers and antenna path selection
- H04B7/082—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection with multiple receivers and antenna path selection selecting best antenna path
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Radio Relay Systems (AREA)
- Radio Transmission System (AREA)
Abstract
PURPOSE:To prevent the lowering of the transmission characteristics and thus to ensure the steady operation with the simple-structure device in case the telephone signals or the like of the comparatively small capacity are transmitted at the area where the fading occurs frequently with use of two units of the microwave receiver. CONSTITUTION:The reception signals which are received by reception antenna 1 and 2 and through the two reception routes are amplified into a fixed amplitude via microwave reception amplifier 21 and 23 and then connected to ratching circulator 25 via isolator 24 and 26 respectively. Level comparator 22 is provided to carry out the comparison of the AGC voltage between amplifier 21 and 23, and circulator 25 is driven by the output of comparator 22. Thus, the output of isolator 24 and 26 are supplied to circulator 25. Then the output of deviation frequency oscillator 11 and the signal of circulator 10 are mixed together at frequency comparator 12 to be sent to transmission amplifier 14 via circulator 10 and transmission filter 13.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15391577A JPS5485626A (en) | 1977-12-20 | 1977-12-20 | Switching diversity type direct-shift repeating installation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15391577A JPS5485626A (en) | 1977-12-20 | 1977-12-20 | Switching diversity type direct-shift repeating installation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5485626A true JPS5485626A (en) | 1979-07-07 |
Family
ID=15572873
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15391577A Pending JPS5485626A (en) | 1977-12-20 | 1977-12-20 | Switching diversity type direct-shift repeating installation |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5485626A (en) |
-
1977
- 1977-12-20 JP JP15391577A patent/JPS5485626A/en active Pending
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