GB207736A - Improvements in and relating to wireless telephony or the like - Google Patents
Improvements in and relating to wireless telephony or the likeInfo
- Publication number
- GB207736A GB207736A GB513423A GB513423A GB207736A GB 207736 A GB207736 A GB 207736A GB 513423 A GB513423 A GB 513423A GB 513423 A GB513423 A GB 513423A GB 207736 A GB207736 A GB 207736A
- Authority
- GB
- United Kingdom
- Prior art keywords
- station
- wave
- signals
- transmitting
- circuit
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
207,736. Anstey, R. W. Feb. 22, 1923. Secret and selective signalling systems.-In order to permit non-interfering telephone communication between a large number of stations, each station uses a combination of wave-lengths in sequence, the tuning of the transmitting- circuit and the circuit of the desired receiving- station being varied step-by-step by synchronous distributing-devices at the two stations. In order to confuse listeners at unauthorized stations, the transmitting-station also transmits confusing signals or noises, these signals being sent out on the same series of wave lengths. but in different sequence. Fig. 1 shows a transmitting-circuit, and Fig. 3 a construction of distributor. The aerial circuit C is energized by an oscillating valve O, connected to a modulating valve and microphone P. The aerial circuit has three parallel branches X, Y, Z each tuned to a different frequency, and each connected to a segment of the distributor. The branches are completed in turn by the passage of a ball down an inclined slide 1, the balls being released from pockets in a drum 2, which is stepped forward by a solenoid 4 operating a pawl-and-ratchet device when a synchronizing-signal is received. The desired receiving-station has similar means for varying the tuning of its aerial circuit, and also receives the synchronizing-signals, which are preferably sent out from a central station on a long wavelength, but may be sent out from the station transmitting. The confusing signals are sent out from the transmitting-station on the same set of wave-lengths as the telephonic message, but the distributor for the confusing signals is arranged to give the wave-lengths in different order, so that at every moment the message wave-length is different from the confusing wave-length. The distributor for the confusing signals may have only one or two segments. Gyroscopic apparatus may be used for maintaining the distributors level on ships.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB513423A GB207736A (en) | 1923-02-22 | 1923-02-22 | Improvements in and relating to wireless telephony or the like |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB513423A GB207736A (en) | 1923-02-22 | 1923-02-22 | Improvements in and relating to wireless telephony or the like |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB207736A true GB207736A (en) | 1923-12-06 |
Family
ID=9790334
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB513423A Expired GB207736A (en) | 1923-02-22 | 1923-02-22 | Improvements in and relating to wireless telephony or the like |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB207736A (en) |
-
1923
- 1923-02-22 GB GB513423A patent/GB207736A/en not_active Expired
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