GB248838A - Improvements in high frequency signalling systems - Google Patents
Improvements in high frequency signalling systemsInfo
- Publication number
- GB248838A GB248838A GB2980424A GB2980424A GB248838A GB 248838 A GB248838 A GB 248838A GB 2980424 A GB2980424 A GB 2980424A GB 2980424 A GB2980424 A GB 2980424A GB 248838 A GB248838 A GB 248838A
- Authority
- GB
- United Kingdom
- Prior art keywords
- circuit
- amplifier
- antenna
- waves
- condenser
- 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
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H2/00—Networks using elements or techniques not provided for in groups H03H3/00 - H03H21/00
- H03H2/005—Coupling circuits between transmission lines or antennas and transmitters, receivers or amplifiers
- H03H2/006—Transmitter or amplifier output circuits
Abstract
248,838. Western Electric Co., Ltd., (Western Electric Co., Inc.). Dec. 11, 1924. Thermionic generators; modulating systems and harmonics, absorbing.-In a high frequency transmission system, more particularly for use as a radio transmitting circuit, a tuned circuit TC is interposed between the power amplifier circuit PA and the antenna or load circuit A in order to suppress the transfer of harmonics to the antenna or load circuit. The circuit TC and antenna circuit A are both tuned to the fundamental frequency. The circuit TC is made up of two parallel branches, one of which includes a variable condenser 4 in series with an adjustable inductance 3 and the other of which includes a capacity 5 having a lower impedance than the first mentioned branch to the higher frequencies. The condenser 4 is also included in the antenna circuit, which comprises, in addition, the tuning coil 6 and aerial 7, so that the condenser 4 serves as a common coupling element for transferring energy from the power amplifier output circuit to the antenna. In order to secure ordinarily loose coupling, the capacity of the coupling condenser 4 is made large relatively to the other capacity 5. The modulating system, comprising the transmitter 1, voice frequency amplifier VA, and amplifier OA, is similar to that described in Specifications 133,366 and 152,811, whilst the source 2 and its circuit for supplying high frequency carrier waves to the amplifier OA is preferably of the kind disclosed in Specification 141,046. Space current is supplied from the source 8 to the amplifiers VA, OA in common through the choke coil. The amplified speech waves from the amplifier VA act to modulate the waves supplied from the source 2 in the amplifier circuit OA and the resulting modulated waves are impressed on the grids of the power amplifier system P.A., which is of the type in which the tubes are worked beyond the straight portion of their characteristics during at least one half cycle of the waves impressed in the inputs thereof.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2980424A GB248838A (en) | 1924-12-11 | 1924-12-11 | Improvements in high frequency signalling systems |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2980424A GB248838A (en) | 1924-12-11 | 1924-12-11 | Improvements in high frequency signalling systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB248838A true GB248838A (en) | 1926-03-11 |
Family
ID=10297417
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2980424A Expired GB248838A (en) | 1924-12-11 | 1924-12-11 | Improvements in high frequency signalling systems |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB248838A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2568922A (en) * | 2017-11-30 | 2019-06-05 | Wcs Services Ltd | Improvements relating to hypochlorous acid |
-
1924
- 1924-12-11 GB GB2980424A patent/GB248838A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2568922A (en) * | 2017-11-30 | 2019-06-05 | Wcs Services Ltd | Improvements relating to hypochlorous acid |
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