GB625268A - Improvements in circuits for modulating the frequency or the phase of electrical oscillations - Google Patents
Improvements in circuits for modulating the frequency or the phase of electrical oscillationsInfo
- Publication number
- GB625268A GB625268A GB21540/46A GB2154046A GB625268A GB 625268 A GB625268 A GB 625268A GB 21540/46 A GB21540/46 A GB 21540/46A GB 2154046 A GB2154046 A GB 2154046A GB 625268 A GB625268 A GB 625268A
- Authority
- GB
- United Kingdom
- Prior art keywords
- circuit
- oscillations
- feed
- frequency
- modulating
- 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
- 230000010355 oscillation Effects 0.000 title abstract 6
- 238000006073 displacement reaction Methods 0.000 abstract 1
- 230000004048 modification Effects 0.000 abstract 1
- 238000012986 modification Methods 0.000 abstract 1
- 230000003534 oscillatory effect Effects 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03C—MODULATION
- H03C3/00—Angle modulation
- H03C3/10—Angle modulation by means of variable impedance
- H03C3/12—Angle modulation by means of variable impedance by means of a variable reactive element
- H03C3/14—Angle modulation by means of variable impedance by means of a variable reactive element simulated by circuit comprising active element with at least three electrodes, e.g. reactance-tube circuit
Landscapes
- Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
- Ac-Ac Conversion (AREA)
- Amplitude Modulation (AREA)
Abstract
625,268. Frequency and phase modulation. PHILIPS LAMPS, Ltd. July 18, 1946, No. 21540. Convention date, Feb. 25, 1943. [Class 40 (v)] In a circuit for modulating the frequency or phase of oscillations by means of a modulator tube which functions as a reactance, feed-back of the modulating oscillations, but not of the carrier, is provided for the tube so that the instantaneous value of the frequency or phase displacement produced by the modulation is proportional to the instantaneous value of the modulations and distortion thereby eliminated. As shown in Fig. 1, the oscillator generator 1 is connected to an oscillatory circuit 2, 3, which feeds a pentode 4 arranged to act as a reactance for the oscillations to be modulated by the provision of a network 6, 7. To secure frequency modulation without distortion, negative or positive feed-back of the modulating oscillations only is provided for the tube 4 so as to obtain a square function characteristic for anode current-control grid voltage. The correct negative feed-back is obtained in the circuit shown by a resistance 13 included in the cathode circuit which is shunted in respect of the carrier oscillations by a condenser 14. The desired negative feed-back may however be obtained from a resistance in the screen grid circuit or when a triode is used by a resistance in the anode circuit. When positive feed-back is required, the control grid circuit may be coupled to the circuit of one of the current carrying electrodes by a transformer. In a modification employing a hexode as the modulator and wherein the anode current/ control grid voltage is linear, the feed-back resistance 13 is connected in the screen grid circuit.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL241543X | 1943-02-25 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB625268A true GB625268A (en) | 1949-06-24 |
Family
ID=19780577
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB21540/46A Expired GB625268A (en) | 1943-02-25 | 1946-07-18 | Improvements in circuits for modulating the frequency or the phase of electrical oscillations |
Country Status (6)
Country | Link |
---|---|
US (1) | US2582673A (en) |
BE (1) | BE454503A (en) |
CH (1) | CH241543A (en) |
DE (1) | DE864413C (en) |
FR (1) | FR902171A (en) |
GB (1) | GB625268A (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB687783A (en) * | 1950-04-15 | 1953-02-18 | Emi Ltd | Improvements relating to circuit arrangements for modulating carrier frequency signals |
DE872228C (en) * | 1951-09-18 | 1953-03-30 | Telefunken Gmbh | Circuit for modulating high frequency vibrations |
US2858436A (en) * | 1953-12-14 | 1958-10-28 | Gen Electric | Automatic frequency control system |
JPS6042393Y2 (en) * | 1980-01-24 | 1985-12-26 | シチズン時計株式会社 | Waterproof reuse device for quartz watches |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2279660A (en) * | 1937-04-13 | 1942-04-14 | Rca Corp | Wave length modulation system |
US2323598A (en) * | 1941-01-07 | 1943-07-06 | Rca Corp | Variable signal response network |
US2361658A (en) * | 1942-10-26 | 1944-10-31 | Rca Corp | Sound recording and reproducing system |
US2394427A (en) * | 1942-11-09 | 1946-02-05 | Rca Corp | Wave length modulation |
US2383848A (en) * | 1943-02-25 | 1945-08-28 | Rca Corp | Reactance control circuit |
US2382436A (en) * | 1943-08-18 | 1945-08-14 | Bell Telephone Labor Inc | Reactance tube circuit |
-
0
- BE BE454503D patent/BE454503A/xx unknown
-
1944
- 1944-02-22 DE DEN24455A patent/DE864413C/en not_active Expired
- 1944-02-23 CH CH241543D patent/CH241543A/en unknown
- 1944-02-23 FR FR902171D patent/FR902171A/en not_active Expired
-
1946
- 1946-07-15 US US683696A patent/US2582673A/en not_active Expired - Lifetime
- 1946-07-18 GB GB21540/46A patent/GB625268A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
CH241543A (en) | 1946-03-15 |
US2582673A (en) | 1952-01-15 |
FR902171A (en) | 1945-08-21 |
DE864413C (en) | 1953-01-26 |
BE454503A (en) |
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