JPS56119859A - Detector for electric field intensity - Google Patents
Detector for electric field intensityInfo
- Publication number
- JPS56119859A JPS56119859A JP2432080A JP2432080A JPS56119859A JP S56119859 A JPS56119859 A JP S56119859A JP 2432080 A JP2432080 A JP 2432080A JP 2432080 A JP2432080 A JP 2432080A JP S56119859 A JPS56119859 A JP S56119859A
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- electric field
- signal
- detector
- local 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
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/08—Measuring electromagnetic field characteristics
- G01R29/0864—Measuring electromagnetic field characteristics characterised by constructional or functional features
- G01R29/0871—Complete apparatus or systems; circuits, e.g. receivers or amplifiers
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Current Or Voltage (AREA)
Abstract
PURPOSE:To shorten the required time of measurement by adding a circuit which opens the gate of an electric field intensity detector through outputting a lock detection signal when the oscillation frequency of the local oscillator of a phase-synchronous loop agrees with a target value. CONSTITUTION:The output of voltage-controlled local oscillator 5 included in phase-synchronous loop 4 is sent to frequency divider 10 and the frequency-divided by a frequency dividing ratio based upon a target frequency for channel selection. Lock detector 15 is provided which compares this frequency-divided signal with a signal from reference oscillator 11 and, at the moment their frequencies agree with each other, sends lock detection signal (d). With this signal (d), the gate of electric field intensity detector 9 is opened to detect the intensity of the electric field. Thus, the need to wait until the frequency of local oscillator 5 gets stable is eliminated and electric fields having plural radio waves can be detected successively in a short time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2432080A JPS56119859A (en) | 1980-02-27 | 1980-02-27 | Detector for electric field intensity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2432080A JPS56119859A (en) | 1980-02-27 | 1980-02-27 | Detector for electric field intensity |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS56119859A true JPS56119859A (en) | 1981-09-19 |
Family
ID=12134884
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2432080A Pending JPS56119859A (en) | 1980-02-27 | 1980-02-27 | Detector for electric field intensity |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS56119859A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06311077A (en) * | 1993-04-22 | 1994-11-04 | Nec Corp | Electric field measurement circuit |
-
1980
- 1980-02-27 JP JP2432080A patent/JPS56119859A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06311077A (en) * | 1993-04-22 | 1994-11-04 | Nec Corp | Electric field measurement circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| GB1461404A (en) | Coin selection method and apparatus | |
| CA2010265A1 (en) | Phase-locked loop apparatus | |
| JPS6411408A (en) | Automatic frequency sweeping method for frequency synthesizer type channel selecting device | |
| JPS56119859A (en) | Detector for electric field intensity | |
| GB1155371A (en) | Frequency Divider | |
| FR2330198A1 (en) | Freely oscillating tunable oscillator - has frequency divider for oscillator output signal, and several detectors | |
| US3546618A (en) | Low power,high stability digital frequency synthesizer | |
| US3406353A (en) | Automatic tuning of quantum resonance circuits | |
| JPS55130249A (en) | Code synchronous system for reception of spectrum diffusion signal | |
| JPS55149539A (en) | Pll circuit | |
| Kukolich | Measurements of the 3-2 inversion frequency and frequency stability of a two-cavity ammonia maser | |
| JPS5788366A (en) | Apparatus c/n measurement | |
| JPS6424503A (en) | Frequency converting device | |
| JPS5753135A (en) | Channel selecting device | |
| FR2335997A1 (en) | Phase locked loop for local oscillator in radar equipment - compares phase of transmitter magnetron output with local oscillator of receiver | |
| JPS5795727A (en) | Frequency synthesizer | |
| JPS6451826A (en) | Phase locked loop oscillator | |
| JPS57111181A (en) | Automatic measuring system for noise exponent of tuner | |
| SE7710219L (en) | DEVICE IN A RADAR SYSTEM FOR LOADING A LOCAL ACHILLATOR FOR A RELEASED FREQUENCY BAND | |
| JPS57200870A (en) | Phase difference detector | |
| JPS5691524A (en) | Electronic tuning radio receiver | |
| JPS5647741A (en) | Decoupling device for nuclear magnetic resonating device | |
| JPS56108945A (en) | Microwave radiometer | |
| ES337283A1 (en) | Improvements in or relating to superhetrodyne transmitter-receivers | |
| JPS5675728A (en) | Detection circuit of digital pll lock state |