GB633007A - Improvements in and relating to carrier transmission systems - Google Patents
Improvements in and relating to carrier transmission systemsInfo
- Publication number
- GB633007A GB633007A GB1086347A GB1086347A GB633007A GB 633007 A GB633007 A GB 633007A GB 1086347 A GB1086347 A GB 1086347A GB 1086347 A GB1086347 A GB 1086347A GB 633007 A GB633007 A GB 633007A
- Authority
- GB
- United Kingdom
- Prior art keywords
- carrier
- circuits
- frequency bands
- transmission systems
- sideband
- 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
- H04J—MULTIPLEX COMMUNICATION
- H04J1/00—Frequency-division multiplex systems
- H04J1/18—Frequency-division multiplex systems in which all the carriers are amplitude-modulated
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Abstract
633,007. Carrier transmission systems. GENERAL ELECTRIC CO., Ltd., and OLLERENSHAW, C. April 23, 1947, No. 10863. [Class 40 (iv)] Intermediate stations 23, 24 in a carrier system using power lines 15 have four-wire two-way repeaters 19, 20 connected in byepass circuits. The repeaters each include amplifiers 37, 45, Fig. 2, and filters 32, 38 and 40, 46 tuned to the different frequency bands used for transmission in the E and W directions. Local signals from a microphone 54 modulate a first carrier in a modulator 56, one sideband being selected by a filter 57. The sideband modulates a second carrier in a modulator 58, the second carrier frequency being so chosen that the two sidebands lie within the frequency bands E and W respectively. The sidebands are applied to the repeater circuits by hybrid coils 60, 35, 43 after amplification by an amplifier 59. A similar receiving circuit comprising demodulators 49, 51 and a filter 50 is connected to the repeater circuits by hybrid coils 47, 33, 41. In a modification, the frequency bands E and W may include two or more channels, additional local modulation and demodulation circuits being provided.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1086347A GB633007A (en) | 1947-04-23 | 1947-04-23 | Improvements in and relating to carrier transmission systems |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1086347A GB633007A (en) | 1947-04-23 | 1947-04-23 | Improvements in and relating to carrier transmission systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB633007A true GB633007A (en) | 1949-12-05 |
Family
ID=9975700
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1086347A Expired GB633007A (en) | 1947-04-23 | 1947-04-23 | Improvements in and relating to carrier transmission systems |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB633007A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2240906A (en) * | 1990-02-08 | 1991-08-14 | Technophone Ltd | Radio transceiver filtering arrangement |
-
1947
- 1947-04-23 GB GB1086347A patent/GB633007A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2240906A (en) * | 1990-02-08 | 1991-08-14 | Technophone Ltd | Radio transceiver filtering arrangement |
| US5267234A (en) * | 1990-02-08 | 1993-11-30 | Technophone Limited | Radio transceiver with duplex and notch filter |
| GB2240906B (en) * | 1990-02-08 | 1994-04-13 | Technophone Ltd | Radio transceiver |
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