GB470645A - Reduction of intermodulation in two-way communication cables - Google Patents
Reduction of intermodulation in two-way communication cablesInfo
- Publication number
- GB470645A GB470645A GB495536A GB495536A GB470645A GB 470645 A GB470645 A GB 470645A GB 495536 A GB495536 A GB 495536A GB 495536 A GB495536 A GB 495536A GB 470645 A GB470645 A GB 470645A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cable
- intermodulation
- loading
- terminal
- portions
- 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
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B11/00—Communication cables or conductors
- H01B11/02—Cables with twisted pairs or quads
- H01B11/12—Arrangements for exhibiting specific transmission characteristics
- H01B11/16—Cables, e.g. submarine cables, with coils or other devices incorporated during cable manufacture
Landscapes
- Coils Or Transformers For Communication (AREA)
Abstract
470,645. Loading &c. STANDARD TELEPHONES & CABLES, Ltd., and LATIMER, K. E. Feb. 18, 1936, No. 4955. Drawings to Specification. [Class 40 (iv)] Near end intermodulation effects in a twoway cable due to non-linear characteristics of the loading or dielectric material are reduced by using terminal portions of smaller non- linearity for a distance comparable with a wavelength for frequencies falling in the middle of a channel. In a particular case, the amplitude of intermodulation products arising in the type of cable used for a terminal portion may be half that arising in the main portion of the cable, but the near end intermodulation products of the combined cable show a much greater reduction. In a continuously loaded cable the terminal and main portions have the same inductance per unit length, but the magnetic properties of the loading of the terminal portions are different. In a coilloaded cable the coils have the same inductance throughout the cable, but those in the terminal portions have a lower hysteresis factor, e.g. ¢, due to different size or material of the core. Where the dielectric is the factor introducing the intermodulation effects, the capacity is uniform throughout the cable but the dielectric of the end portions has a lower non-linear distortion factor. The Specification contains a mathematical discussion of the problem.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB495536A GB470645A (en) | 1936-02-18 | 1936-02-18 | Reduction of intermodulation in two-way communication cables |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB495536A GB470645A (en) | 1936-02-18 | 1936-02-18 | Reduction of intermodulation in two-way communication cables |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB470645A true GB470645A (en) | 1937-08-18 |
Family
ID=9787029
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB495536A Expired GB470645A (en) | 1936-02-18 | 1936-02-18 | Reduction of intermodulation in two-way communication cables |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB470645A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2762863A (en) * | 1948-07-23 | 1956-09-11 | Wheeler Leonard Keith | Electronic regenerative repeater |
-
1936
- 1936-02-18 GB GB495536A patent/GB470645A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2762863A (en) * | 1948-07-23 | 1956-09-11 | Wheeler Leonard Keith | Electronic regenerative repeater |
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