GB784129A - Improvements in or relating to electrical signalling systems - Google Patents
Improvements in or relating to electrical signalling systemsInfo
- Publication number
- GB784129A GB784129A GB2405953A GB2405953A GB784129A GB 784129 A GB784129 A GB 784129A GB 2405953 A GB2405953 A GB 2405953A GB 2405953 A GB2405953 A GB 2405953A GB 784129 A GB784129 A GB 784129A
- Authority
- GB
- United Kingdom
- Prior art keywords
- phase
- winding
- toroids
- input impedance
- openings
- 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
- 230000011664 signaling Effects 0.000 title 1
- 238000004804 winding Methods 0.000 abstract 7
- 230000004907 flux Effects 0.000 abstract 3
- 239000000969 carrier Substances 0.000 abstract 1
- 238000006073 displacement reaction Methods 0.000 abstract 1
- 230000004048 modification Effects 0.000 abstract 1
- 238000012986 modification Methods 0.000 abstract 1
- 230000010363 phase shift Effects 0.000 abstract 1
- 230000035945 sensitivity Effects 0.000 abstract 1
- 229910000859 α-Fe Inorganic materials 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J1/00—Frequency-division multiplex systems
- H04J1/02—Details
- H04J1/06—Arrangements for supplying the carrier waves ; Arrangements for supplying synchronisation signals
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/52—Circuit arrangements for protecting such amplifiers
- H03F1/54—Circuit arrangements for protecting such amplifiers with tubes only
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Power Engineering (AREA)
- Control Of Electrical Variables (AREA)
Abstract
784,129. Automatic phase and voltage control ystems; inductors. BRITISH TELECOMMUNICATIONS RESEARCH, Ltd. Aug. 11, 1954 [Aug. 31, 1953], No. 24059/53. Classes 38 (2) and 38 (4). [Also in Group XXXIX] Carrier currents from two nominally identical supply equipments having a common frequency control, are combined with a relative phase displacement of 120 degrees so that no change in amplitude occurs if one equipment fails, the phase relationship being automatically maintained constant. As shown in Fig. 1, separate carriers from equipments S1, S2 are combined in two loads LA, LB over transformers T1, T2, the circuit from S1 including a phase-shifting network comprising a saturable reactor L1, the primary windings of T1 and the input impedance of a transformer T3. The secondary circuit of T3 includes a #/2 phase-shifting network inverting the impedance of a saturable reactor load L2 so that the input impedance of T3 is capacitive. Since both saturable reactors L1, L2 are controlled by rectified current derived from the combined output, variations of output amplitude cause the inductance of L1 and the capacitive input impedance of T3 to change and so vary the phase-shift imposed in the circuit from S1. In a modification, condensers C1 C2 may be shunted across L1, L2 to improve sensitivity and range of control. Each saturable reactor, Fig. 2, comprises a pair of ferrite toroids having pressed or ground slots forming openings SL1-SL3. The A.C. winding is made up of four equal sections W1-W4 which are accommodated in openings SL1, SL2 and have localized and opposed flux paths. The D.C. control winding and bias winding, if any, are wound together over the two toroids so that their fluxes act circumferentially. To suppress possible circulating A.C. fluxes, a short-circuited winding SC1-SC2 is arranged through opening SL3. By suitably spacing the two toroids optimum inductances may be obtained. Both reactors may be arranged on a single core which has double the. number of openings, a shortcircuited winding being interposed between the A.C. windings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2405953A GB784129A (en) | 1953-08-31 | 1953-08-31 | Improvements in or relating to electrical signalling systems |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2405953A GB784129A (en) | 1953-08-31 | 1953-08-31 | Improvements in or relating to electrical signalling systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB784129A true GB784129A (en) | 1957-10-02 |
Family
ID=10205710
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2405953A Expired GB784129A (en) | 1953-08-31 | 1953-08-31 | Improvements in or relating to electrical signalling systems |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB784129A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3011064A (en) * | 1956-04-11 | 1961-11-28 | Philips Corp | Electric gating device |
| GB2250894A (en) * | 1990-10-01 | 1992-06-17 | Telenokia Oy | Providing redundancy in digital transmission equipment |
-
1953
- 1953-08-31 GB GB2405953A patent/GB784129A/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3011064A (en) * | 1956-04-11 | 1961-11-28 | Philips Corp | Electric gating device |
| GB2250894A (en) * | 1990-10-01 | 1992-06-17 | Telenokia Oy | Providing redundancy in digital transmission equipment |
| GB2250894B (en) * | 1990-10-01 | 1995-01-04 | Telenokia Oy | System for providing redundancy for the baseband main channels of digital transmission equipment |
| DE4132729C2 (en) * | 1990-10-01 | 2002-01-31 | Nokia Telecomm Oy Espoo | Circuit arrangement for creating redundancy for baseband main channels of a digital transmission device |
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