JPS54114914A - Radio unit for use with phase synchronizing circuit - Google Patents
Radio unit for use with phase synchronizing circuitInfo
- Publication number
- JPS54114914A JPS54114914A JP2234778A JP2234778A JPS54114914A JP S54114914 A JPS54114914 A JP S54114914A JP 2234778 A JP2234778 A JP 2234778A JP 2234778 A JP2234778 A JP 2234778A JP S54114914 A JPS54114914 A JP S54114914A
- Authority
- JP
- Japan
- Prior art keywords
- reception signal
- circuit
- synchronism
- phase
- switch
- 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
- H03—ELECTRONIC CIRCUITRY
- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D3/00—Demodulation of angle-, frequency- or phase- modulated oscillations
- H03D3/02—Demodulation of angle-, frequency- or phase- modulated oscillations by detecting phase difference between two signals obtained from input signal
- H03D3/24—Modifications of demodulators to reject or remove amplitude variations by means of locked-in oscillator circuits
- H03D3/241—Modifications of demodulators to reject or remove amplitude variations by means of locked-in oscillator circuits the oscillator being part of a phase locked loop
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Noise Elimination (AREA)
- Circuits Of Receivers In General (AREA)
Abstract
PURPOSE:To enable to perform phase synchronization to the reception signal quickly, by reducing the effect due to the interference waves when the reception signal is weak, through disabling the phase synchronizing circuit for the synchronism if the reception signal is less than the predetermined level. CONSTITUTION:In the radio unit picking up the demodulation output from the reception signal by the phase synchronism circuit, the reception signal which is less than the predetermined level is detected for example, with the directional coupler SDC, filter NBP, rectifying circuit DD, and hysteresis circuit HYS. The output of the hysteresis circuit HYS closes the switch BSW, the voltage of the bias power supply BS is fed to the voltage controlled oscillator VCO of the phase locked loop PLL, disabling synchronism. Further, when the level of the reception signal is more than the given level, the switch BSW is opened and normal operation is again initiated in a very short time. Moreover, the switch SW is opened simultaneously with the switch BSW closed, it is recuired to stop transmission.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2234778A JPS54114914A (en) | 1978-02-28 | 1978-02-28 | Radio unit for use with phase synchronizing circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2234778A JPS54114914A (en) | 1978-02-28 | 1978-02-28 | Radio unit for use with phase synchronizing circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS54114914A true JPS54114914A (en) | 1979-09-07 |
Family
ID=12080130
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2234778A Pending JPS54114914A (en) | 1978-02-28 | 1978-02-28 | Radio unit for use with phase synchronizing circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS54114914A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4517531A (en) * | 1981-01-09 | 1985-05-14 | Fuji Xerox Co., Ltd. | Carrier wave reproducing circuit in synchronized detection system of medium speed facsimile |
-
1978
- 1978-02-28 JP JP2234778A patent/JPS54114914A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4517531A (en) * | 1981-01-09 | 1985-05-14 | Fuji Xerox Co., Ltd. | Carrier wave reproducing circuit in synchronized detection system of medium speed facsimile |
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