GB679130A - Improvements in or relating to frequency stabilizing systems - Google Patents
Improvements in or relating to frequency stabilizing systemsInfo
- Publication number
- GB679130A GB679130A GB27695/49A GB2769549A GB679130A GB 679130 A GB679130 A GB 679130A GB 27695/49 A GB27695/49 A GB 27695/49A GB 2769549 A GB2769549 A GB 2769549A GB 679130 A GB679130 A GB 679130A
- Authority
- GB
- United Kingdom
- Prior art keywords
- mixer
- output
- oscillator
- frequency
- discriminator
- 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.)
- Expired
Links
- 230000000087 stabilizing effect Effects 0.000 title 1
- 230000008878 coupling Effects 0.000 abstract 3
- 238000010168 coupling process Methods 0.000 abstract 3
- 238000005859 coupling reaction Methods 0.000 abstract 3
- 239000013078 crystal Substances 0.000 abstract 2
- 239000003990 capacitor Substances 0.000 abstract 1
- 230000007423 decrease Effects 0.000 abstract 1
- 238000010438 heat treatment Methods 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/04—Sources of current
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/02—Automatic control of frequency or phase; Synchronisation using a frequency discriminator comprising a passive frequency-determining element
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
- Oscillators With Electromechanical Resonators (AREA)
Abstract
679,130. Frequency measuring. WESTING- HOUSE ELECTRIC INTERNATIONAL CO. Oct. 28, 1949 [Nov. 2, 1948], No. 27695/49. Class 37. [Also in Group XXXV] The frequency of an R.F. oscillator is measured by combining the outputs of a broadband discriminator and a sharp discriminator, both having the same cross-over frequency. The output of the oscillator 30 (supplying a heating load 32), is applied, via coupling coil 36, to a pair of mixer circuits 15, 18, supplying the broad-band discriminator, and to a pair of mixer circuits 113, 114, supplying the sharp discriminator. Mixer 15 comprises a crystal oscillator having a frequency 2 mc/s. below that of the oscillator 30, and an output circuit 52, 53, tuned slightly above the difference frequency. Mixer 18 is similar but its oscillator operates 2 mc/s. above oscillator 30, hence a change, e.g. an increase, in the frequency of oscillator 30 increases the output frequency of mixer 15 and decreases that of mixer 18. The outputs of the mixers 15, 18 are applied via band-pass amplifiers 16, 19, to the broad-band discriminator 20, the output of which is connected to the output of the sharp discriminator 145. The output of a crystal oscillator 12 (operating at the frequency of oscillator 30) appears across a resistor 109 and is applied to mixer 113 by a capacitor 119 and grid resistor 108 so that the input voltage leads the voltage across resistor 109 by 45 degrees. The voltage across resistor 109 is also applied to mixer 114 by a resistor 121, which together with the input capacity of the valve cause the input voltage to lag that across resistor 109 by 45 degrees. The output of mixer 113 passes via an amplifier 131 to a cathode follower phase splitter 137, the anode and cathode output of which are applied to the anodes of the discriminator 145 by coupling circuits 150, 143, 141, 142. The output of mixer 114 passes via an amplifier 153 to the mid-point of resistors 142, 143, so that it is 90 degrees out-of-phase with both of the other input voltages. Due to the coupling circuits 150, 143; 141, 142, the voltages from the phase splitter change in phase relative to the voltage from mixer 114 upon frequency deviation. Hence a resultant voltage appears across resistors 147, 148; which is added to the output of the discriminator 20 and is used to control the tuning of the oscillator 30.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US679130XA | 1948-11-02 | 1948-11-02 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB679130A true GB679130A (en) | 1952-09-10 |
Family
ID=22079221
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB27695/49A Expired GB679130A (en) | 1948-11-02 | 1949-10-28 | Improvements in or relating to frequency stabilizing systems |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB679130A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2660613A1 (en) * | 2012-05-03 | 2013-11-06 | Gamesa Innovation & Technology, S.L. | Method and module for measuring the rate of change of frequency of waveforms related to converter units in wind turbine generators. |
-
1949
- 1949-10-28 GB GB27695/49A patent/GB679130A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2660613A1 (en) * | 2012-05-03 | 2013-11-06 | Gamesa Innovation & Technology, S.L. | Method and module for measuring the rate of change of frequency of waveforms related to converter units in wind turbine generators. |
| ES2428240R1 (en) * | 2012-05-03 | 2014-03-05 | Gamesa Innovation & Technology S.L | Method and Module to measure the frequency change rate of the waveforms related to the wind turbine converter units |
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