GB1103623A - A wireless personal call system - Google Patents
A wireless personal call systemInfo
- Publication number
- GB1103623A GB1103623A GB21646/65A GB2164665A GB1103623A GB 1103623 A GB1103623 A GB 1103623A GB 21646/65 A GB21646/65 A GB 21646/65A GB 2164665 A GB2164665 A GB 2164665A GB 1103623 A GB1103623 A GB 1103623A
- Authority
- GB
- United Kingdom
- Prior art keywords
- frequency
- transformers
- served
- loop
- transmitter
- 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
- 230000006698 induction Effects 0.000 abstract 5
- 230000005540 biological transmission Effects 0.000 abstract 3
- 230000011664 signaling Effects 0.000 abstract 2
- 239000003990 capacitor Substances 0.000 abstract 1
- 230000001939 inductive effect Effects 0.000 abstract 1
- 230000010287 polarization Effects 0.000 abstract 1
- 238000004804 winding Methods 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Near-Field Transmission Systems (AREA)
- Mobile Radio Communication Systems (AREA)
- Radio Transmission System (AREA)
Abstract
1,103,623. Aerials; inductive signalling; radio signalling. TELEFUNKEN PATENTVERWERTUNGS G.m.b.H. 21 May, 1965 [23 May, 1964], No. 21646/65. Headings H4A, H4L and H4U. A wireless personal call system using two frequencies for transmission comprises an induction loop for low frequencies and at least one resonant aerial for high frequencies, the latter being fed through at least part of the cable which constitutes the induction loop. As described, a cable 3 comprising two lines 1, 2 is formed into a loop around an area to be served and its ends are connected to the primary windings of two transformers 7, a low-frequency signal for transmission being fed to the two centre taps 12 thereof. Folded high-frequency dipoles 6 are connected across the lines 1, 2 via decoupling resistors 5 and transformers 4, and signals received by them are coupled through the transformers 12 to two receivers 8, 9. A diversity device provides for connection of the receiver having the stronger signal to an amplifier 10 which is connected to a loud-speaker 11. The dipoles may point in various directions so as to cover the whole area to be served, and they may be arranged for receiving signals having different polarizations. The low-frequency signal for transmission is supplied to the induction loop by a transmitter 14 having a microphone 18 and an output transformer 13. Connection to the centre points 12 of the transformers 7 is made via wave-traps 15, 16 and a loop tuning variable capacitor 17 is provided. A mobile station for operation within the service area comprises a microphone 22 connected to a highfrequency transmitter 23 and a high-frequency aerial 24, and also an induction loop aerial 19 connected to a low-frequency receiver 20 and a loud-speaker 21. In an alternative arrangement, an area containing a building is served by a lowfrequency transmitter by means of an induction loop around it, and an area outside is served by a high-frequency transmitter by means of resonant aerials fed through the cable which forms the loop.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DET0026249 | 1964-05-23 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1103623A true GB1103623A (en) | 1968-02-21 |
Family
ID=7552641
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB21646/65A Expired GB1103623A (en) | 1964-05-23 | 1965-05-21 | A wireless personal call system |
Country Status (2)
| Country | Link |
|---|---|
| DE (1) | DE1466460B2 (en) |
| GB (1) | GB1103623A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2438898A (en) * | 2006-06-10 | 2007-12-12 | Roke Manor Research | Antenna array of inward pointing elements |
-
1964
- 1964-05-23 DE DE19641466460 patent/DE1466460B2/en active Pending
-
1965
- 1965-05-21 GB GB21646/65A patent/GB1103623A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2438898A (en) * | 2006-06-10 | 2007-12-12 | Roke Manor Research | Antenna array of inward pointing elements |
Also Published As
| Publication number | Publication date |
|---|---|
| DE1466460A1 (en) | 1969-05-14 |
| DE1466460B2 (en) | 1972-05-10 |
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