JPS54116162A - Variable frequency step down unit - Google Patents
Variable frequency step down unitInfo
- Publication number
- JPS54116162A JPS54116162A JP2281578A JP2281578A JPS54116162A JP S54116162 A JPS54116162 A JP S54116162A JP 2281578 A JP2281578 A JP 2281578A JP 2281578 A JP2281578 A JP 2281578A JP S54116162 A JPS54116162 A JP S54116162A
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- step down
- fed
- frequency step
- oscillator
- 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
- Superheterodyne Receivers (AREA)
Abstract
PURPOSE: To simplify the circuit and to make small the circuit, by providing the variable frequency step down means having the frequency step down value of N and the fixed frequency step down means having the step down value M connected to it.
CONSTITUTION: The output of the local oscillator 9 having higher frequency fL than the output frequency fO of the voltage controlled oscillator 4, and the output of the oscillator 4 are fed to the frequency converter 5, the difference frequency between the both is fed to the fixed frequency step down unit 12, and one pulse is counted. Next, the frequency step down value is fed to the frequency step down units 6 to 8 from the selector 10 in common use with the display unit, N' demultiplication is made, and the demultiplied signal fv and the reference frequency fR from the reference frequency oscillator 1 are fed to the phase comparator 2, the signal detecting the phase difference of the both is fed back to the oscillator 4 via LPF 3 and the output frequency fO is obtained. Taking N'+1=N with the phase synchronous state, then fO=fL-NfR. When the frequency step down value N' is controlled with the selector 10 delivering binary decimal number corresponding to the complement of 9 to the display value, N becomes natural number continuous in the complement of 10.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2281578A JPS54116162A (en) | 1978-03-02 | 1978-03-02 | Variable frequency step down unit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2281578A JPS54116162A (en) | 1978-03-02 | 1978-03-02 | Variable frequency step down unit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS54116162A true JPS54116162A (en) | 1979-09-10 |
Family
ID=12093177
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2281578A Pending JPS54116162A (en) | 1978-03-02 | 1978-03-02 | Variable frequency step down unit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS54116162A (en) |
-
1978
- 1978-03-02 JP JP2281578A patent/JPS54116162A/en active Pending
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