GB998886A - Improvements in or relating to high frequency distribution systems - Google Patents
Improvements in or relating to high frequency distribution systemsInfo
- Publication number
- GB998886A GB998886A GB4432462A GB4432462A GB998886A GB 998886 A GB998886 A GB 998886A GB 4432462 A GB4432462 A GB 4432462A GB 4432462 A GB4432462 A GB 4432462A GB 998886 A GB998886 A GB 998886A
- Authority
- GB
- United Kingdom
- Prior art keywords
- hybrid
- master oscillator
- output
- gate
- hybrids
- 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
- 230000010363 phase shift Effects 0.000 abstract 2
- 230000004048 modification Effects 0.000 abstract 1
- 238000012986 modification Methods 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
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Transmitters (AREA)
- Radio Relay Systems (AREA)
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
Abstract
998,886. Radio transmitting systems. MARCONI CO. Ltd Oet. 9, 1963 [Nov. 23, 1962], No. 44324/62. Heading H4L. In a high-frequency distribution system, particularly for use in multi-transmitter radio stations, in which carrier drives to the various transmitters are provided by frequency synthesizors fed from a common master oscillator, the frequency distribution is effected by hybrid junctions which ensure that the master frequency continues to be supplied despite local circuit failures, and means are also provided for automatic changeover to a standby master oscillator. As shown, the main master oscillator 1 is arranged to supply a signal via a normally open gate 2 and gate control circuit 3 to block the gate 2A in the output circuit of the standby master oscillator 1A, but if a fault occurs in the master oscillator 1 the gate 2A is opened and the gate 2 blocked via control circuit 3A. The gates 2, 2A supply the single input ports of hybrids 4, 4A, respectively. One output of the hybrid 4 is connected to one of the two inputs of a hybrid 5 and the remaining output is connected to one input of a hybrid 5A, the hybrid 4A being likewise connected to the remaining inputs of hybrids 5, 5A. Thus whichever master oscillator is in use will supply both channels 5 to 8 and 5A to 8A. The output of hybrid 5 is amplified at 6, given a phase shift of 30 degrees at 7 and supplied to the single input of a hybrid 8, the output from 5A, being treated similarly but given a phase shift of 30 degrees in the opposite sense. The outputs of hybrids 8, 8A are distributed to a plurality of points, one only frequency synthesizer 24 being shown, by hybrids 9 to 22 and 9A to 22A, cross-connected as shown, the relative phase-difference of 60 degrees between the two channels ensuring that when the two input signals are present, for example at hybrid 23, the output signal is of equal amplitude to that when only one is present. A switch may be included to select which of the oscillators 1, lA shall act as master oscillator as by modifying the biasing of gates 2, 2A. A modification including an additional standby oscillator is described.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB4432462A GB998886A (en) | 1962-11-23 | 1962-11-23 | Improvements in or relating to high frequency distribution systems |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB4432462A GB998886A (en) | 1962-11-23 | 1962-11-23 | Improvements in or relating to high frequency distribution systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB998886A true GB998886A (en) | 1965-07-21 |
Family
ID=10432759
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB4432462A Expired GB998886A (en) | 1962-11-23 | 1962-11-23 | Improvements in or relating to high frequency distribution systems |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB998886A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2079262A1 (en) * | 1970-02-05 | 1971-11-12 | Philips Nv |
-
1962
- 1962-11-23 GB GB4432462A patent/GB998886A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2079262A1 (en) * | 1970-02-05 | 1971-11-12 | Philips Nv |
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