GB1043822A - Improvements relating to inductive signalling systems - Google Patents
Improvements relating to inductive signalling systemsInfo
- Publication number
- GB1043822A GB1043822A GB188564A GB188564A GB1043822A GB 1043822 A GB1043822 A GB 1043822A GB 188564 A GB188564 A GB 188564A GB 188564 A GB188564 A GB 188564A GB 1043822 A GB1043822 A GB 1043822A
- Authority
- GB
- United Kingdom
- Prior art keywords
- loop
- frequency
- inductive
- jan
- capacitor
- 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
- 230000001939 inductive effect Effects 0.000 title abstract 3
- 230000011664 signaling Effects 0.000 title abstract 2
- 239000003990 capacitor Substances 0.000 abstract 3
- 238000013016 damping Methods 0.000 abstract 1
- 230000001172 regenerating effect Effects 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)
- Amplifiers (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
1,043,822. Inductive signalling; transistor tuned amplifiers. TELEFUNKEN PATENTVERWERTUNGSGESESELLSCHAFT. Jan. 15, 1964 [Jan. 15, 1963], No. 1885/64. Headings H3T and H4U. In an inductive communication system a loop 1, Fig. 1, extends around the service area and is coupled to a receiver 2 and a transmitter 5 which amplify and frequency convert signals f 1 induced in the loop for re-application to the loop as a frequency f 2 to enable two-way communication between portable transmitter receivers 8, 9. The loop 1 is tuned to resonance at the frequency f 1 by a capacitor 7. The portable sets may be provided with selective calling devices and transmit a carrier wave which is frequencymodulated by signals from a microphone which in the receive position operates as a loudspeaker. The receiver 2 may be coupled to the loop 1 through a pre-amplifier 23, Fig. 3 (not shown), the capacitor 7 being replaced by capacitors 20, 21. The potential across resistor 22 is applied via an adjustable resistor 24 to the resonant circuit 1, 20, 21 as regenerative feedback to reduce the damping of the loop.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE1963T0023327 DE1258912B (en) | 1963-01-15 | 1963-01-15 | System for wireless communication with high frequency between moving stations with each other with transceivers |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1043822A true GB1043822A (en) | 1966-09-28 |
Family
ID=7550945
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB188564A Expired GB1043822A (en) | 1963-01-15 | 1964-01-15 | Improvements relating to inductive signalling systems |
Country Status (2)
| Country | Link |
|---|---|
| DE (1) | DE1258912B (en) |
| GB (1) | GB1043822A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4136338A (en) * | 1977-03-08 | 1979-01-23 | James D. Pauls & Associates, Ltd. | Perimeter alarm apparatus |
| GB2138657A (en) * | 1983-04-22 | 1984-10-24 | Stephen John Irwin | Near Field Signalling System |
| GB2142508A (en) * | 1983-06-29 | 1985-01-16 | Private Mobile Rentals Limited | Improvements relating to communications systems |
| US4584707A (en) * | 1985-01-22 | 1986-04-22 | Dataproducts New England, Inc. | Cordless communications system |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE865006C (en) * | 1941-11-29 | 1953-01-29 | Siemens Ag | Circuit arrangement for monitoring the operation of carrier frequency systems |
| FR1039892A (en) * | 1951-07-17 | 1953-10-12 | Cie Ind Des Telephones | Device for locating faults in intermediate equipment of a telephone or telegraph link with multiple channels operated in two wires |
| DE963244C (en) * | 1954-02-20 | 1957-05-02 | Telefunken Gmbh | Arrangement for the transmission of messages to a mobile station |
| DE1032327B (en) * | 1954-07-28 | 1958-06-19 | Siemens Ag | Circuit arrangement for monitoring the operation of carrier frequency systems |
| DE1015485B (en) * | 1956-07-21 | 1957-09-12 | Siemens Ag | Movable microphone arrangement with a microphone amplifier which, in particular, forms a structural unit with the microphone |
| DE1092064B (en) * | 1959-04-30 | 1960-11-03 | Philips Patentverwaltung | Arrangement for inductive messaging |
| GB879606A (en) * | 1959-07-17 | 1961-10-11 | Ass Elect Ind | Improvements relating to inductive loop communication systems |
| DE1048609B (en) * | 1959-09-12 | 1959-01-15 |
-
1963
- 1963-01-15 DE DE1963T0023327 patent/DE1258912B/en active Pending
-
1964
- 1964-01-15 GB GB188564A patent/GB1043822A/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4136338A (en) * | 1977-03-08 | 1979-01-23 | James D. Pauls & Associates, Ltd. | Perimeter alarm apparatus |
| GB2138657A (en) * | 1983-04-22 | 1984-10-24 | Stephen John Irwin | Near Field Signalling System |
| GB2142508A (en) * | 1983-06-29 | 1985-01-16 | Private Mobile Rentals Limited | Improvements relating to communications systems |
| US4584707A (en) * | 1985-01-22 | 1986-04-22 | Dataproducts New England, Inc. | Cordless communications system |
Also Published As
| Publication number | Publication date |
|---|---|
| DE1258912B (en) | 1968-01-18 |
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