GB641543A - Improvements in or relating to frequency-modulation circuits - Google Patents
Improvements in or relating to frequency-modulation circuitsInfo
- Publication number
- GB641543A GB641543A GB20021/46A GB2002146A GB641543A GB 641543 A GB641543 A GB 641543A GB 20021/46 A GB20021/46 A GB 20021/46A GB 2002146 A GB2002146 A GB 2002146A GB 641543 A GB641543 A GB 641543A
- Authority
- GB
- United Kingdom
- Prior art keywords
- valve
- anode
- oscillator
- modulator
- condenser
- 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
- 230000008878 coupling Effects 0.000 abstract 3
- 238000010168 coupling process Methods 0.000 abstract 3
- 238000005859 coupling reaction Methods 0.000 abstract 3
- 230000010355 oscillation 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
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03C—MODULATION
- H03C3/00—Angle modulation
- H03C3/02—Details
- H03C3/08—Modifications of modulator to linearise modulation, e.g. by feedback, and clearly applicable to more than one type of modulator
Landscapes
- Circuit Arrangements For Discharge Lamps (AREA)
- Superheterodyne Receivers (AREA)
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
Abstract
641,543. Frequency modulation. PHILIPS LAMPS, Ltd. July 4, 1946, No. 20021. Convention date, June 30, 1942. [Class 40 (v)] Frequency modulation is produced by feeding back from a modulator comprising one or more valves to the anode circuit of an oscillator valve 1, Fig. 1, an amplitude modulated signal derived from but differing in phase by about 90 degrees from the anode voltage of the valve in such a way that no coupling exists between the anode of the oscillator and the modulating oscillations except that due to the electron stream of a valve. A condenser 5, Fig. 1, of high reactance and resistance 7 feed to a modulator valve 6, having in its anode circuit a modulator 10, a grid voltage in phase quadrature with the anode voltage of the oscillator valve 1 to produce a modulator valve anode voltage also in quadrature which is impressed by a condenser and inductively coupled coils 9, 2, on a tuned anode circuit of the oscillator 1, additional coupled coils 8, 11 negativing any in-phase coupling between the anode circuits of the valves. Alternatively, Fig. 2, the modulator valve 6 is connected by resistance capacity coupling with a reactance valve 12 with anode connected to the oscillator valve and to a phase quadrature condenser 5 and resistance 7 input of the modulator valve 6. Alternatively, Fig. 3, amplitude modulation of the quadrature volate fed from the oscillator valve 1 to the grid of the reactance valve 12 by a condenser 5, resistances 7 and 19, and a circuit 17 tuned to the mean oscillator frequency"damped by a resistance 18, is effected by a diode 14, battery 15 and modulation source 16 across the grid. The diode limits the modulating carrier wave amplitude to the difference between the battery and modulation voltages. Valves in push-pull may alternatively be used.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL247881X | 1942-06-30 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB641543A true GB641543A (en) | 1950-08-16 |
Family
ID=19780930
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB20021/46A Expired GB641543A (en) | 1942-06-30 | 1946-07-04 | Improvements in or relating to frequency-modulation circuits |
Country Status (6)
Country | Link |
---|---|
US (1) | US2541649A (en) |
BE (1) | BE451284A (en) |
CH (1) | CH247881A (en) |
FR (1) | FR895914A (en) |
GB (1) | GB641543A (en) |
NL (1) | NL64026C (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE977095C (en) * | 1950-03-07 | 1965-01-28 | Siemens Ag | Electrical two-pole in a circuit for frequency modulation, frequency adjustment or the adjustment of measuring bridge arrangements |
US2666182A (en) * | 1950-09-19 | 1954-01-12 | Rca Corp | Frequency control apparatus |
US2857573A (en) * | 1953-05-22 | 1958-10-21 | Rca Corp | Frequency modulated transistor oscillator |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1777410A (en) * | 1928-03-06 | 1930-10-07 | Lester L Jones | Variable relay condenser |
US2351368A (en) * | 1942-06-03 | 1944-06-13 | Rca Corp | Reactance tube |
US2350171A (en) * | 1942-06-19 | 1944-05-30 | Rca Corp | Reactance controlled generator |
-
0
- BE BE451284D patent/BE451284A/xx unknown
- NL NL64026D patent/NL64026C/xx active
-
1943
- 1943-06-28 FR FR895914D patent/FR895914A/en not_active Expired
- 1943-06-28 CH CH247881D patent/CH247881A/en unknown
-
1946
- 1946-04-27 US US665389A patent/US2541649A/en not_active Expired - Lifetime
- 1946-07-04 GB GB20021/46A patent/GB641543A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
BE451284A (en) | |
US2541649A (en) | 1951-02-13 |
FR895914A (en) | 1945-02-07 |
NL64026C (en) | 1900-01-01 |
CH247881A (en) | 1947-03-31 |
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