GB243683A - Improvements in high frequency signalling systems - Google Patents
Improvements in high frequency signalling systemsInfo
- Publication number
- GB243683A GB243683A GB24878/25A GB2487825A GB243683A GB 243683 A GB243683 A GB 243683A GB 24878/25 A GB24878/25 A GB 24878/25A GB 2487825 A GB2487825 A GB 2487825A GB 243683 A GB243683 A GB 243683A
- Authority
- GB
- United Kingdom
- Prior art keywords
- valve
- plate
- filament
- grid
- 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
Classifications
-
- 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
-
- 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
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/04—Control of transmission; Equalising
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/20—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other
Abstract
243,683. British Thomson-Houston Co.. Ltd., (Assignees of Carter, E. F.). Nov. 25, 1924, [Convention date.]. Thermionic amplifiers, generators, and modulating systems; combined transmitting and receiving arrangements; coupling aerial and detector circuits; wired wireless systems.-In a combined transmitting and receiving set the oscillations of the transmitter are inhibited, when not required, by a high impedance inserted in the high tension supply to the oscillator, this impedance comprising a valve with negative grid. In the oscillator 2 the filament is connected through a resistance a to the grid and plate, the plate being in series with a rejector circuit b one point c of which is connected to the filament. High tension is supplied to the plate over a circuit comprising the filament, the choke d (which prevents the control valve from modulating the output of the oscillator 2), the plate-filament path of the control valve 7, the high-tension commutator @ of the generator 8, and the choke f. Normally this high-tension supply circuit is interrupted owing to the negative grid bias of the valve 7, which is provided by the battery 9 : but when voice currents from the microphone 6, amplified by the valve 5, act on the grid G7 through the transformer secondary 10, the impedance of the valve 7 is lowered and the valve 2 is consequently enabled to oscillate. The plate of the latter valve is connected through the condenser 12 and resistance g to the grid of the power amplifier 3 whose plate is choke coupled to the modulator 4. The output coil 13 is coupled to the tuned link circuit 14 and so through condensers 15 to the power line or other antenna 1. The receiver 16, tuned to the same frequency as the transmitter, is connected to the link circuit 14 by a further link circuit 18, but the latter is bridged by a diode 20 whose plate is somewhat negative with respect to its filament. This diode shunts the strong transmitter signals. but has no effect on the weak received signals.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US752243A US1696566A (en) | 1924-11-25 | 1924-11-25 | High-frequency duplex signaling system |
| US227821A US1696590A (en) | 1924-11-25 | 1927-10-21 | Signaling system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB243683A true GB243683A (en) | 1926-07-22 |
Family
ID=26921788
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB24878/25A Expired GB243683A (en) | 1924-11-25 | 1925-10-06 | Improvements in high frequency signalling systems |
| GB30503/28A Expired GB299316A (en) | 1924-11-25 | 1928-10-22 | Improvements in high frequency electric signalling systems |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB30503/28A Expired GB299316A (en) | 1924-11-25 | 1928-10-22 | Improvements in high frequency electric signalling systems |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US1696590A (en) |
| BE (2) | BE331740A (en) |
| DE (2) | DE500530C (en) |
| FR (1) | FR606311A (en) |
| GB (2) | GB243683A (en) |
| NL (2) | NL24644C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE755785C (en) * | 1933-03-16 | 1952-03-31 | Marconi Wireless Telegraph Co | Arrangement for the automatic activation of a transmitter with the help of rectified modulation oscillations |
-
0
- BE BE355192D patent/BE355192A/xx unknown
- NL NL18958D patent/NL18958C/xx active
- NL NL24644D patent/NL24644C/xx active
- BE BE331740D patent/BE331740A/xx unknown
-
1925
- 1925-09-04 FR FR606311D patent/FR606311A/en not_active Expired
- 1925-09-29 DE DEI26703D patent/DE500530C/en not_active Expired
- 1925-10-06 GB GB24878/25A patent/GB243683A/en not_active Expired
-
1927
- 1927-10-21 US US227821A patent/US1696590A/en not_active Expired - Lifetime
-
1928
- 1928-10-21 DE DEI35835D patent/DE500305C/en not_active Expired
- 1928-10-22 GB GB30503/28A patent/GB299316A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| NL18958C (en) | |
| GB299316A (en) | 1929-06-27 |
| US1696590A (en) | 1928-12-25 |
| FR606311A (en) | 1926-06-11 |
| BE331740A (en) | |
| DE500305C (en) | 1930-06-20 |
| DE500530C (en) | 1930-06-21 |
| BE355192A (en) | |
| NL24644C (en) |
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