GB316946A - Improvements in and relating to the control of alternating currents, especially those of high frequency - Google Patents
Improvements in and relating to the control of alternating currents, especially those of high frequencyInfo
- Publication number
- GB316946A GB316946A GB23934/29A GB2393429A GB316946A GB 316946 A GB316946 A GB 316946A GB 23934/29 A GB23934/29 A GB 23934/29A GB 2393429 A GB2393429 A GB 2393429A GB 316946 A GB316946 A GB 316946A
- Authority
- GB
- United Kingdom
- Prior art keywords
- circuit
- valves
- grids
- keying
- aerial
- 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
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03C—MODULATION
- H03C1/00—Amplitude modulation
- H03C1/08—Amplitude modulation by means of variable impedance element
- H03C1/10—Amplitude modulation by means of variable impedance element the element being a current-dependent inductor
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/02—Amplitude-modulated carrier systems, e.g. using on-off keying; Single sideband or vestigial sideband modulation
- H04L27/04—Modulator circuits; Transmitter circuits
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Power Engineering (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Selective Calling Equipment (AREA)
- Operation Control Of Excavators (AREA)
Abstract
316,946. Lorenz Akt.-Ges., C., (Assignees of Pohontsch, M.). Aug. 6, 1928, [Convention date]. Magnetic modulating systems; keying systems. - alternating currents, particularly high-frequency currents employed in wireless signalling, are modulated or interrupted by the use of a pair of iron-cored chokes, one in the aerial or load circuit, and the other in an absorbing circuit with similar constants, not coupled to the aerial circuit. As shown in Fig. 3, the generator circuit, which may be energized directly or through a frequency-multiplier from an alternator 1, or by a valve generator, is coupled by transformers 3, 4 to an aerial circuit V and to an absorbing circuit X. Iron-cored choke coils 9, 18 in the respective circuits are saturated in turn, the transmitting key or microphone, being arranged to vary the direct current in these windings. The windings 13, 19 may be arranged in the plate circuits of a pair of valves V1, V2, Fig. 4. For telegraphy, a keying -device or relay R is arranged to render these valves conductive and non-conductive in turn by biasing their grids, the switches U being in the vertical position. For telephony, the switches U are thrown horizontal to couple the grids of valves V1, V2 to the plates of valves V3, V4, the grids of the latter pair being controlled in push-pull fashion by a microphone circuit M. The purpose of the arrangement is to maintain a constant load on the oscillation generator, and so prevent surges and variations of frequency during the keying or modulating operation.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE316946X | 1928-08-06 | ||
DE318512X | 1928-09-04 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB316946A true GB316946A (en) | 1930-06-26 |
Family
ID=25798558
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB23934/29A Expired GB316946A (en) | 1928-08-06 | 1929-08-03 | Improvements in and relating to the control of alternating currents, especially those of high frequency |
GB25155/29A Expired GB318512A (en) | 1928-08-06 | 1929-08-17 | Improvements in and relating to the control of alternating currents, especially those of high frequency |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB25155/29A Expired GB318512A (en) | 1928-08-06 | 1929-08-17 | Improvements in and relating to the control of alternating currents, especially those of high frequency |
Country Status (2)
Country | Link |
---|---|
FR (1) | FR679916A (en) |
GB (2) | GB316946A (en) |
-
1929
- 1929-08-03 GB GB23934/29A patent/GB316946A/en not_active Expired
- 1929-08-05 FR FR679916D patent/FR679916A/en not_active Expired
- 1929-08-17 GB GB25155/29A patent/GB318512A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
FR679916A (en) | 1930-04-23 |
GB318512A (en) | 1930-07-03 |
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