JPS5563141A - Radio communication apparatus - Google Patents
Radio communication apparatusInfo
- Publication number
- JPS5563141A JPS5563141A JP13694778A JP13694778A JPS5563141A JP S5563141 A JPS5563141 A JP S5563141A JP 13694778 A JP13694778 A JP 13694778A JP 13694778 A JP13694778 A JP 13694778A JP S5563141 A JPS5563141 A JP S5563141A
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- intermediate frequency
- reception
- designation
- local oscillation
- 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
Landscapes
- Transceivers (AREA)
- Superheterodyne Receivers (AREA)
Abstract
PURPOSE: To improve the reception spurious response by securing the oscillation of the frequency higher than the reception frequency of the 1st intermediate frequency by the amount equivalent to the 2nd intermediate frequency at the local oscillation part where the 1st intermediate frequency is converted into the 2nd intermediate frequency.
CONSTITUTION: The radio communication apparatus consists of antenna 1, common filter 2, transmission part 3, reception part 4', frequency synthsizer 30 and control part 31 each. And with application of the channel CH designation No. to terminal Y, the 1st local oscillation is selected from control part 31. The 2nd local oscillation part 32 comprises crystal oscillator 33 featuring the frequency higher than 1st intermediate frequency fi1 by 2nd intermediate frequency fi2, crystal oscillator 34 featuring the frequency lower than fi1 by fi2, oscillation part 35 plus switches 36 and 37 each. Thus the selection is decided between these two oscillators with every CH designation No. and by the CH designation which is memorized previously at control part 31. In this way, the reception spurious response can be improved greatly, thus omitting the highly rated common filter and thus realizing an effective utilization of the frequency.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13694778A JPS5563141A (en) | 1978-11-07 | 1978-11-07 | Radio communication apparatus |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13694778A JPS5563141A (en) | 1978-11-07 | 1978-11-07 | Radio communication apparatus |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5563141A true JPS5563141A (en) | 1980-05-13 |
Family
ID=15187230
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP13694778A Pending JPS5563141A (en) | 1978-11-07 | 1978-11-07 | Radio communication apparatus |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5563141A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4800730A (en) * | 1984-07-16 | 1989-01-31 | Suetrak Transportkaelte Gmbh | Arrangement for influencing the speed of a compressor of a refrigerating system |
KR100435554B1 (en) * | 1998-12-22 | 2004-10-14 | 서창전기통신 주식회사 | Radio Frequency Transceiver System by Crystal Switching |
-
1978
- 1978-11-07 JP JP13694778A patent/JPS5563141A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4800730A (en) * | 1984-07-16 | 1989-01-31 | Suetrak Transportkaelte Gmbh | Arrangement for influencing the speed of a compressor of a refrigerating system |
KR100435554B1 (en) * | 1998-12-22 | 2004-10-14 | 서창전기통신 주식회사 | Radio Frequency Transceiver System by Crystal Switching |
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