GB369112A - Improvements in or relating to modulating systems for electric oscillations - Google Patents
Improvements in or relating to modulating systems for electric oscillationsInfo
- Publication number
- GB369112A GB369112A GB19902/31A GB1990231A GB369112A GB 369112 A GB369112 A GB 369112A GB 19902/31 A GB19902/31 A GB 19902/31A GB 1990231 A GB1990231 A GB 1990231A GB 369112 A GB369112 A GB 369112A
- Authority
- GB
- United Kingdom
- Prior art keywords
- valve
- capacity
- resistance
- plate
- circuit
- 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 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)
- Transmitters (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
369,112. Wireless transmitting systems. MARCONI'S WIRELESS TELEGRAPH CO., Marconi House, Strand, London.-(Assignees of Roberts, W. van B. ; 155, Hodge Road, Princeton, New Jersey, U.S.A.) July 10, 1931, No. 19902. Convention date, July 10, 1930. [Class 40 (v).] Frequency modulation is effected by varying a resistance associated with a capacity, the capacity-resistance combination being connected to or coupled with the frequency control circuit of the carrier source. The capacity is the apparent input capacity of a thermionic valve, and the resistance is in its plate circuit and may comprise the plate-filament path of a second valve. This arrangement is shown in Fig. 3, in which the tuned circuit 16 of a valve generator 28 is connected across the grid and cathode of a valve 2, so that the input capacity of this valve is in parallel with the tuned circuit 16. The effective value of this capacity is varied by varying the external plate resistance of the valve 2. This resistance may comprise the modulating microphone, but as shown it comprises the plate-filament path of the valve 30, and the grid 32 of this valve is coupled to the microphone circuit 34, or to the circuit of a modulating source 38 and key 36. The signal produces variations in the frequency of the wave generated by the valve 28, which wave may be amplified at 40 and transferred to an aerial 41. The plate-grid capacity of the valve 2 may be supplemented by a condenser 39.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US466955A US1917394A (en) | 1930-07-10 | 1930-07-10 | Frequency modulation |
Publications (1)
Publication Number | Publication Date |
---|---|
GB369112A true GB369112A (en) | 1932-03-17 |
Family
ID=23853719
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB19902/31A Expired GB369112A (en) | 1930-07-10 | 1931-07-10 | Improvements in or relating to modulating systems for electric oscillations |
Country Status (4)
Country | Link |
---|---|
US (1) | US1917394A (en) |
BE (1) | BE381244A (en) |
GB (1) | GB369112A (en) |
NL (1) | NL35347C (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2473556A (en) * | 1943-03-15 | 1949-06-21 | Carl A Wiley | Device for controlling oscillating circuits |
US2590282A (en) * | 1947-11-08 | 1952-03-25 | Stromberg Carlson Co | Variable impedance device |
-
0
- BE BE381244D patent/BE381244A/xx unknown
- NL NL35347D patent/NL35347C/xx active
-
1930
- 1930-07-10 US US466955A patent/US1917394A/en not_active Expired - Lifetime
-
1931
- 1931-07-10 GB GB19902/31A patent/GB369112A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
NL35347C (en) | |
US1917394A (en) | 1933-07-11 |
BE381244A (en) |
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