GB252027A - Improvements in high frequency electric signalling systems - Google Patents
Improvements in high frequency electric signalling systemsInfo
- Publication number
- GB252027A GB252027A GB12140/26A GB1214026A GB252027A GB 252027 A GB252027 A GB 252027A GB 12140/26 A GB12140/26 A GB 12140/26A GB 1214026 A GB1214026 A GB 1214026A GB 252027 A GB252027 A GB 252027A
- Authority
- GB
- United Kingdom
- Prior art keywords
- amplifier
- radiation
- normally
- grid
- control valve
- 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
- H03C1/62—Modulators in which amplitude of carrier component in output is dependent upon strength of modulating signal, e.g. no carrier output when no modulating signal is present
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
- H04B1/44—Transmit/receive switching
- H04B1/46—Transmit/receive switching by voice-frequency signals; by pilot signals
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
- H04B1/54—Circuits using the same frequency for two directions of communication
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Transmitters (AREA)
- Microwave Amplifiers (AREA)
- Amplifiers (AREA)
Abstract
252,027. British Thomson-Houston Co., Ltd., (Assignees of Byrnes, I. F.). May 11, 1925, [Convention date]. Thermionic modulating systems and apparatus. -Relates to wireless telephone transmitting systems in which radiation is inhibited except when speech is taking place. According to the present invention this is effected by inserting in the plate circuit of an amplifier. as distinct from the oscillator itself, an impedance which normally inhibits radiation but is reduced by the action of the speech currents to a value which permits radiation to take place. Thus in the system comprising the oscillator 2, amplifier 3, power amplifier 4, and modulator 5, the plate circuit of the amplifier 3 is normally choked by the control valve 6 which is included in the circuit and is normally blocked by a bias applied to its grid by the battery 8. When the microphone 9 is spoken into, however, the mean potential of the grid of the valve 6 is rendered more positive and radiation takes place. A choke prevents the oscillations in the control valve from modulating the amplifier. The transmitting apparatus shown may be combined with receiving apparatus as described in Specification 243,683.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US29304A US1631670A (en) | 1925-05-11 | 1925-05-11 | High-frequency signaling system |
Publications (1)
Publication Number | Publication Date |
---|---|
GB252027A true GB252027A (en) | 1927-02-03 |
Family
ID=21848344
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB12140/26A Expired GB252027A (en) | 1925-05-11 | 1926-05-11 | Improvements in high frequency electric signalling systems |
Country Status (3)
Country | Link |
---|---|
US (1) | US1631670A (en) |
DE (1) | DE574254C (en) |
GB (1) | GB252027A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3169221A (en) * | 1962-02-21 | 1965-02-09 | Itt | Audio actuated switch for transceiver transmitter |
-
1925
- 1925-05-11 US US29304A patent/US1631670A/en not_active Expired - Lifetime
-
1926
- 1926-04-15 DE DEI27906D patent/DE574254C/en not_active Expired
- 1926-05-11 GB GB12140/26A patent/GB252027A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3169221A (en) * | 1962-02-21 | 1965-02-09 | Itt | Audio actuated switch for transceiver transmitter |
Also Published As
Publication number | Publication date |
---|---|
DE574254C (en) | 1933-04-11 |
US1631670A (en) | 1927-06-07 |
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