GB369100A - Improvements in or relating to modulation systems for electric oscillations - Google Patents
Improvements in or relating to modulation systems for electric oscillationsInfo
- Publication number
- GB369100A GB369100A GB18023/31A GB1802331A GB369100A GB 369100 A GB369100 A GB 369100A GB 18023/31 A GB18023/31 A GB 18023/31A GB 1802331 A GB1802331 A GB 1802331A GB 369100 A GB369100 A GB 369100A
- Authority
- GB
- United Kingdom
- Prior art keywords
- circuit
- resistance
- condenser
- series
- coil
- 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
- 230000004048 modification Effects 0.000 abstract 1
- 238000012986 modification Methods 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
- H03C3/28—Angle modulation by means of variable impedance using variable impedance driven mechanically or acoustically
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03C—MODULATION
- H03C3/00—Angle modulation
- H03C3/10—Angle modulation by means of variable impedance
- H03C3/24—Angle modulation by means of variable impedance by means of a variable resistive element, e.g. tube
Landscapes
- Transmitters (AREA)
- Amplitude Modulation (AREA)
- Oscillators With Electromechanical Resonators (AREA)
- Amplifiers (AREA)
Abstract
369,100. Wireless transmitting systems. MARCONI'S WIRELESS TELEGRAPH CO., Ltd., Marconi House, Strand, London.-(Assignees of Roberts, W. van B. ; 155, Hodge Road, Princeton, New Jersey, U.S.A.) June 22, 1931, No. 18023. Convention date, July 10, 1930. [Class 40 (v).] Frequency or phase modulation of a carrier wave is effected by passing the wave through a circuit whose L.C. value is half that necessary for resonance, and by applying the signal as variations of resistance either across the condenser, or in series with the inductance, of the tuned circuit. As shown in Fig. 1, a constant voltage of carrier frequency is applied at the terminals 8 of a circuit comprising an inductance 6 in series with a condenser 4 shunted by a variable modulating resistance 2. As the resistance 2 is varied the current through the circuit remains constant, but the phase varies. The circuit 4, 6 may be interposed in an amplifier chain, and the resistance 2 may be the plate-filament path of a valve which has its grid voltage varied by a microphone or other signal producer, Fig. 2 (not shown). The phasemodulated output may be taken by a coil coupled to the coil 6 and may be amplified and passed through a current-limiter before proceeding to the radiating aerial. In a modification shown in Fig. 3, a screen-grid carrier wave amplifier 10 giving a constant output current has in its plate circuit a condenser 4 shunted by a coil 6 in series with a microphone 30 or other variable resistance, the L.C. value of 4 and 6 being half that necessary for resonance with the carrier. Phase-modulated output is taken through a condenser 32 to an amplifier and limiter 34 and thence to the aerial.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US466956A US2050067A (en) | 1930-07-10 | 1930-07-10 | Phase modulation |
Publications (1)
Publication Number | Publication Date |
---|---|
GB369100A true GB369100A (en) | 1932-03-17 |
Family
ID=23853724
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB18023/31A Expired GB369100A (en) | 1930-07-10 | 1931-06-22 | Improvements in or relating to modulation systems for electric oscillations |
Country Status (5)
Country | Link |
---|---|
US (1) | US2050067A (en) |
BE (1) | BE381245A (en) |
DE (1) | DE607669C (en) |
GB (1) | GB369100A (en) |
NL (1) | NL34820C (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE761050C (en) * | 1941-02-18 | 1954-01-11 | Siemens & Halske A G | Phase or frequency modulated transmitter |
NL76618C (en) * | 1949-07-28 |
-
0
- BE BE381245D patent/BE381245A/xx unknown
- NL NL34820D patent/NL34820C/xx active
-
1930
- 1930-07-10 US US466956A patent/US2050067A/en not_active Expired - Lifetime
-
1931
- 1931-06-22 GB GB18023/31A patent/GB369100A/en not_active Expired
- 1931-07-04 DE DER82076D patent/DE607669C/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
NL34820C (en) | |
DE607669C (en) | 1935-01-04 |
BE381245A (en) | |
US2050067A (en) | 1936-08-04 |
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