GB1241268A - Telecommunication substation with equalised transmission - Google Patents
Telecommunication substation with equalised transmissionInfo
- Publication number
- GB1241268A GB1241268A GB61704/69A GB6170469A GB1241268A GB 1241268 A GB1241268 A GB 1241268A GB 61704/69 A GB61704/69 A GB 61704/69A GB 6170469 A GB6170469 A GB 6170469A GB 1241268 A GB1241268 A GB 1241268A
- Authority
- GB
- United Kingdom
- Prior art keywords
- substation
- circuit
- series
- compensation
- diodes
- 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
- 230000005540 biological transmission Effects 0.000 title 1
- 230000000712 assembly Effects 0.000 abstract 1
- 238000000429 assembly Methods 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/738—Interface circuits for coupling substations to external telephone lines
- H04M1/76—Compensating for differences in line impedance
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Amplifiers (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Abstract
1,241,268. Substation circuits. INTERNATIONAL STANDARD ELECTRIC CORP. 18 Dec., 1969 [27 Dec., 1968], No. 61704/69. Heading H4R. Gain of a microphone amplifier T 1 , T 2 in a substation circuit is controlled in dependence on the length of the line to which the circuit is connected by an assembly of diodes D 7 , D 8 connected in series with the balancing network R 1 , R 2 , C 1 , of the substation hybrid, and arranged to shunt the emitter base circuit of the transistor T 2 . C 3 provides for the diode assemblies D 7 and D 8 , which are in series for D.C., to be in parallel in respect of A.C. in the microphone amplifier circuit. Compensation of receiver signal level with line length is provided by the assembly of diodes D 5 , D 6 , which are in series with the D.C. flowing to the substation and also form arms of a bridge circuit feeding the receiver REC. Thermistors TH 1 and TH 2 are provided for temperature compensation. The arrangement of the diode D 6 and Do or D 7 and D 8 in opposed parallel arrangement as regards A.C. provides compensation of their non linearity with signal level.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| BE726061 | 1968-12-27 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1241268A true GB1241268A (en) | 1971-08-04 |
Family
ID=3854022
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB61704/69A Expired GB1241268A (en) | 1968-12-27 | 1969-12-18 | Telecommunication substation with equalised transmission |
Country Status (6)
| Country | Link |
|---|---|
| BE (1) | BE726061A (en) |
| ES (1) | ES374943A1 (en) |
| FR (1) | FR2027214A1 (en) |
| GB (1) | GB1241268A (en) |
| IL (1) | IL33605A (en) |
| NL (1) | NL6919249A (en) |
-
1968
- 1968-12-27 BE BE726061D patent/BE726061A/xx unknown
-
1969
- 1969-12-18 GB GB61704/69A patent/GB1241268A/en not_active Expired
- 1969-12-23 NL NL6919249A patent/NL6919249A/xx unknown
- 1969-12-24 FR FR6944948A patent/FR2027214A1/fr not_active Withdrawn
- 1969-12-25 IL IL33605A patent/IL33605A/en unknown
- 1969-12-26 ES ES374943A patent/ES374943A1/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| ES374943A1 (en) | 1972-02-16 |
| IL33605A0 (en) | 1970-02-19 |
| IL33605A (en) | 1973-05-31 |
| FR2027214A1 (en) | 1970-09-25 |
| NL6919249A (en) | 1970-06-30 |
| BE726061A (en) | 1969-06-27 |
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