GB206499A - Improvements in controlled wireless telephony - Google Patents
Improvements in controlled wireless telephonyInfo
- Publication number
- GB206499A GB206499A GB27175/23A GB2717523A GB206499A GB 206499 A GB206499 A GB 206499A GB 27175/23 A GB27175/23 A GB 27175/23A GB 2717523 A GB2717523 A GB 2717523A GB 206499 A GB206499 A GB 206499A
- Authority
- GB
- United Kingdom
- Prior art keywords
- spindle
- core
- cam
- dash
- pot
- 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
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
- H04K1/00—Secret communication
- H04K1/003—Secret communication by varying carrier frequency at or within predetermined or random intervals
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Toys (AREA)
- Selective Calling Equipment (AREA)
Abstract
206,499. Gould, R. Howe-. Nov. 3, 1922, [Convention date]. Secret and selective systems. -A message is transmitted with an irregular but periodic and continuous variation of wavelength to which the tuning of the receiving aerial is synchronized by means of a rotating cam. A motor 7 controlled by a governor 10 rotates a spindle 8 on which is mounted a cam 13, Fig. 2, having an irregular outline cor. responding to the variations in wave-length imparted to the transmitted message. The edge of the cam controls the setting of the vario-coupler 4, 6 through an arm 14. Before the commencement of transmission the switch 19 is moved over to connect up the circuit 12 coupled to a valve 21. A prolonged calling signal energizes a relay 22 and closes a local circuit containing a solenoid 24, the core 25 of which is fully raised against a dash-pot 26. At the cessation of the preliminary signal the core 25 drops freely, with sufficient momentum to depress a lever 25, and so clutch the spindle 8 to the driving-shaft of the motor 7. The dash-pot 26 prevents the core from being fully retracted by the effect of atmospheric or fortuitous signals. In a modification several cams similar to 13 are mounted on the spindle 8 and are arranged so that the receiving aerial may be tuned to one or other of various simultaneous transmissions on different basic wave-lengths.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ZA206499X | 1922-11-03 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB206499A true GB206499A (en) | 1924-07-31 |
Family
ID=25560169
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB27175/23A Expired GB206499A (en) | 1922-11-03 | 1923-10-30 | Improvements in controlled wireless telephony |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB206499A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3407354A (en) * | 1942-04-09 | 1968-10-22 | Naval Res Lab | Motor and self-synchronous generator frequency synchronization units for swept frequency secret communications system |
| US4102521A (en) * | 1961-10-20 | 1978-07-25 | Boelkow Entwicklungen Kg | System for signal coding |
-
1923
- 1923-10-30 GB GB27175/23A patent/GB206499A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3407354A (en) * | 1942-04-09 | 1968-10-22 | Naval Res Lab | Motor and self-synchronous generator frequency synchronization units for swept frequency secret communications system |
| US4102521A (en) * | 1961-10-20 | 1978-07-25 | Boelkow Entwicklungen Kg | System for signal coding |
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