GB721106A - Improvements in or relating to frequency-stabilized oscillator circuit arrangements - Google Patents
Improvements in or relating to frequency-stabilized oscillator circuit arrangementsInfo
- Publication number
- GB721106A GB721106A GB13524/53A GB1352453A GB721106A GB 721106 A GB721106 A GB 721106A GB 13524/53 A GB13524/53 A GB 13524/53A GB 1352453 A GB1352453 A GB 1352453A GB 721106 A GB721106 A GB 721106A
- Authority
- GB
- United Kingdom
- Prior art keywords
- frequency
- tube
- grid
- condenser
- amplifier
- 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
- 238000010168 coupling process Methods 0.000 abstract 1
- 238000005859 coupling reaction Methods 0.000 abstract 1
- 230000010355 oscillation Effects 0.000 abstract 1
- 230000006641 stabilisation Effects 0.000 abstract 1
- 238000011105 stabilization Methods 0.000 abstract 1
Classifications
-
- 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
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
- H03L7/08—Details of the phase-locked loop
- H03L7/10—Details of the phase-locked loop for assuring initial synchronisation or for broadening the capture range
- H03L7/12—Details of the phase-locked loop for assuring initial synchronisation or for broadening the capture range using a scanning signal
-
- 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
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
- H03L7/16—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop
- H03L7/20—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a harmonic phase-locked loop, i.e. a loop which can be locked to one of a number of harmonically related frequencies applied to it
Landscapes
- Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
Abstract
721,106. Automatic frequency control systems. PHILIPS ELECTRICAL INDUSTRIES, Ltd. May 14, 1953 [May 17, 1952], No. 13524/53. Class 38 (4). The search voltage source, used for extending the catching range of a frequency stabilization system as in Specification 684,217, is constituted by a reciprocally-coupled valve pair comprising the frequency-regulating reactance tube and an auxiliary amplifier tube. As shown, the controlled oscillator comprises a heptode tube 2 with back-coupling to a tuned circuit 4, and its output is mixed with that of a reference source 11, which may be a pulse or a sine-wave source, in a phase-comparer 12. The comparer output is integrated at 13 and passed through a low-pass filter 14 to the control grid of a reactance tube 7 which is connected across the tuned circuit 4 to correct its frequency to that of the reference source 11, or to an harmonic thereof. If the frequency error is too large, the oscillator fails to lock-in, and the search voltage generator comes into operation. This comprises the reactance tube 7 and an auxiliary triode amplifier 15, reciprocally coupled. The anode of the reactance tube is connected to the grid of the amplifier 15 through a network comprising as a series member a series combination of resistor 17 and condenser 18, and as a shunt member, parallel-connected resistor 19 and condenser 20. The anode of the amplifier 15 is directly connected to the screen grid of the reactance tube 7 both of which are earthed for the oscillator frequency by a condenser 23 shunting the resistor 22. The valve pair 7, 15 oscillates at a low frequency determined by the constants of the inter-valve network, and the effective reactance of the tube 7 is thus swept through a range wide enough to ensure locking of the oscillator to the frequency source 11. As soon as locking occurs, the negative feed-back round the AFC loop renders the search voltage generator inoperative. A high-frequency choke 16, and the condenser 21, prevent the H.F. oscillations from entering the RC network 17 ... 20. The triode 15 and the heptode 2 may be in a common envelope, with the triode grid connected to an intermediate grid of the heptode.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL721106X | 1952-05-17 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB721106A true GB721106A (en) | 1954-12-29 |
Family
ID=19816700
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB13524/53A Expired GB721106A (en) | 1952-05-17 | 1953-05-14 | Improvements in or relating to frequency-stabilized oscillator circuit arrangements |
Country Status (6)
Country | Link |
---|---|
US (1) | US2775703A (en) |
BE (1) | BE519977A (en) |
DE (1) | DE936881C (en) |
FR (1) | FR1077341A (en) |
GB (1) | GB721106A (en) |
NL (2) | NL85193C (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL89299C (en) * | 1955-09-23 | |||
US2833923A (en) * | 1955-10-13 | 1958-05-06 | Gen Electric | Hunting a. f. c. system |
US2874292A (en) * | 1956-05-21 | 1959-02-17 | Skyline Products Inc | Emergency signaling device |
US2972720A (en) * | 1957-09-24 | 1961-02-21 | Westinghouse Electric Corp | Automatic frequency control apparatus |
DE1194463B (en) * | 1961-09-05 | 1965-06-10 | Siemens Ag | Frequency control circuit |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2268872A (en) * | 1939-07-11 | 1942-01-06 | Hewlett Packard Co | Variable frequency oscillation generator |
BE442115A (en) * | 1940-02-29 | |||
US2434294A (en) * | 1943-10-22 | 1948-01-13 | Sperry Gyroscope Co Inc | Frequency control system |
FR956079A (en) * | 1946-09-20 | 1950-01-24 | ||
NL85185C (en) * | 1948-03-27 | |||
US2601436A (en) * | 1948-04-17 | 1952-06-24 | Hartford Nat Bank & Trust Co | Frequency control apparatus |
US2631239A (en) * | 1950-02-01 | 1953-03-10 | Lower Jack Wesley | Automatic frequency control system |
-
0
- NL NLAANVRAGE7400795,A patent/NL169676B/en unknown
- NL NL85193D patent/NL85193C/xx active
- BE BE519977D patent/BE519977A/xx unknown
-
1953
- 1953-05-14 GB GB13524/53A patent/GB721106A/en not_active Expired
- 1953-05-14 DE DEN7186A patent/DE936881C/en not_active Expired
- 1953-05-15 FR FR1077341D patent/FR1077341A/en not_active Expired
- 1953-05-18 US US355778A patent/US2775703A/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
FR1077341A (en) | 1954-11-05 |
DE936881C (en) | 1955-12-22 |
BE519977A (en) | |
NL169676B (en) | |
US2775703A (en) | 1956-12-25 |
NL85193C (en) |
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