GB341568A - Method of, and means for, maintaining secrecy in the transmission of wireless telegraphic messages - Google Patents
Method of, and means for, maintaining secrecy in the transmission of wireless telegraphic messagesInfo
- Publication number
- GB341568A GB341568A GB32351/29A GB3235129A GB341568A GB 341568 A GB341568 A GB 341568A GB 32351/29 A GB32351/29 A GB 32351/29A GB 3235129 A GB3235129 A GB 3235129A GB 341568 A GB341568 A GB 341568A
- Authority
- GB
- United Kingdom
- Prior art keywords
- frequencies
- working
- circuit
- open
- arm
- 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
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/34—Bits, or blocks of bits, of the telegraphic message being interchanged in time
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L2209/00—Additional information or applications relating to cryptographic mechanisms or cryptographic arrangements for secret or secure communication H04L9/00
- H04L2209/80—Wireless
Abstract
341,568. Wireless signalling. BROENTJES, W., 40, Volkerakstraat, Amsterdam. Oct. 24, 1929, No. 32351. [Class 40 (v).] In a system of secret wireless telegraphy transmission, one group of working frequencies is used for the signals and one group of open-circuit frequencies between the signals, the working and open circuit frequencies being interchanged at will amongst themselves and as groups during transmission. The groups of frequencies used are known to the sender and receiver alone, and are transmitted directly or as modulations of higher frequencies. The changes are effected manually or automatically after a warning signal. In the arrangement shown, the anode inductance tappings 13 .. 18 are connected to a disc switch having a rotating arm M which successively connects various tappings across combinations of the variable condensers kl, k<2>, k<3>. The contact arm M is rotated step by step by a toothed disc B actuated by an escapement D which is in turn controlled by coils W2, W1, respectively energized by the working contact and " open circuit " contact of the transmitting key S. A different frequency is transmitted for each step of the arm M, the tappings 13, 15, 17 determining the open-circuit frequencies and 14, 16, 18 the working frequencies. The open circuit frequencies may be given the character of working waves by interrupters o<1>, o<2>, o<3>, which may be short-circuited by switches s, s<2>, s<3>. The opencircuit and working frequencies may be interchanged by change-over switches c<1>, c<2>, c<3>. A tuned intermediate circuit, similarly controlled by a switch arm actuated by the disc B, may be provided between the aerial and anode or grid circuit of the valve Z, in which case the condensers k<1>, k<2>, k<3> should be mechanically coupled to those of the intermediate circuit. The receiver has a number of tuned circuits, one for each working frequency, connected to a common detector valve so that it is unaffected by change from one working frequency to another.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEB146177D DE571907C (en) | 1929-10-12 | 1929-10-12 | Method and device for achieving secrecy in the wireless transmission of telegraphic reports |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB341568A true GB341568A (en) | 1931-01-22 |
Family
ID=7001181
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB32351/29A Expired GB341568A (en) | 1929-10-12 | 1929-10-24 | Method of, and means for, maintaining secrecy in the transmission of wireless telegraphic messages |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US1869659A (en) |
| BE (1) | BE373894A (en) |
| DE (1) | DE571907C (en) |
| FR (1) | FR703450A (en) |
| GB (1) | GB341568A (en) |
| NL (1) | NL32443C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2283882A (en) * | 1984-11-23 | 1995-05-17 | Marconi Co Ltd | Secure communication system |
Families Citing this family (29)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2433407A (en) * | 1940-04-04 | 1947-12-30 | Int Standard Electric Corp | System of modulation transmission by means of impulses |
| US2836657A (en) * | 1944-11-20 | 1958-05-27 | Gen Electric | Secrecy communication system |
| US4802220A (en) * | 1985-03-20 | 1989-01-31 | American Telephone And Telegraph Company, At&T Bell Laboratories | Method and apparatus for multi-channel communication security |
| US7511621B1 (en) | 1995-08-31 | 2009-03-31 | Intermec Ip Corp. | High-performance mobile power antennas |
| US7498996B2 (en) | 2004-08-18 | 2009-03-03 | Ruckus Wireless, Inc. | Antennas with polarization diversity |
| US8031129B2 (en) | 2004-08-18 | 2011-10-04 | Ruckus Wireless, Inc. | Dual band dual polarization antenna array |
| US7362280B2 (en) | 2004-08-18 | 2008-04-22 | Ruckus Wireless, Inc. | System and method for a minimized antenna apparatus with selectable elements |
| US7193562B2 (en) | 2004-11-22 | 2007-03-20 | Ruckus Wireless, Inc. | Circuit board having a peripheral antenna apparatus with selectable antenna elements |
| US7652632B2 (en) | 2004-08-18 | 2010-01-26 | Ruckus Wireless, Inc. | Multiband omnidirectional planar antenna apparatus with selectable elements |
| US7696946B2 (en) | 2004-08-18 | 2010-04-13 | Ruckus Wireless, Inc. | Reducing stray capacitance in antenna element switching |
| US7292198B2 (en) | 2004-08-18 | 2007-11-06 | Ruckus Wireless, Inc. | System and method for an omnidirectional planar antenna apparatus with selectable elements |
| US7965252B2 (en) | 2004-08-18 | 2011-06-21 | Ruckus Wireless, Inc. | Dual polarization antenna array with increased wireless coverage |
| US7880683B2 (en) | 2004-08-18 | 2011-02-01 | Ruckus Wireless, Inc. | Antennas with polarization diversity |
| CN1934750B (en) | 2004-11-22 | 2012-07-18 | 鲁库斯无线公司 | Circuit board having a peripheral antenna apparatus with selectable antenna elements |
| US7358912B1 (en) | 2005-06-24 | 2008-04-15 | Ruckus Wireless, Inc. | Coverage antenna apparatus with selectable horizontal and vertical polarization elements |
| US7646343B2 (en) | 2005-06-24 | 2010-01-12 | Ruckus Wireless, Inc. | Multiple-input multiple-output wireless antennas |
| US7893882B2 (en) | 2007-01-08 | 2011-02-22 | Ruckus Wireless, Inc. | Pattern shaping of RF emission patterns |
| US20060214845A1 (en) * | 2005-03-23 | 2006-09-28 | Magnus Jendbro | Global positioning system (GPS) accessories, hosts and methods that use radio frequency transmission of raw GPS data |
| US7639106B2 (en) | 2006-04-28 | 2009-12-29 | Ruckus Wireless, Inc. | PIN diode network for multiband RF coupling |
| US8217843B2 (en) | 2009-03-13 | 2012-07-10 | Ruckus Wireless, Inc. | Adjustment of radiation patterns utilizing a position sensor |
| US8698675B2 (en) | 2009-05-12 | 2014-04-15 | Ruckus Wireless, Inc. | Mountable antenna elements for dual band antenna |
| US9407012B2 (en) | 2010-09-21 | 2016-08-02 | Ruckus Wireless, Inc. | Antenna with dual polarization and mountable antenna elements |
| US8842630B2 (en) | 2010-12-17 | 2014-09-23 | Cisco Technology, Inc. | Extendable frequency hopping timeslots in wireless networks |
| US8756668B2 (en) | 2012-02-09 | 2014-06-17 | Ruckus Wireless, Inc. | Dynamic PSK for hotspots |
| US9634403B2 (en) | 2012-02-14 | 2017-04-25 | Ruckus Wireless, Inc. | Radio frequency emission pattern shaping |
| US10186750B2 (en) | 2012-02-14 | 2019-01-22 | Arris Enterprises Llc | Radio frequency antenna array with spacing element |
| US9092610B2 (en) | 2012-04-04 | 2015-07-28 | Ruckus Wireless, Inc. | Key assignment for a brand |
| US9570799B2 (en) | 2012-09-07 | 2017-02-14 | Ruckus Wireless, Inc. | Multiband monopole antenna apparatus with ground plane aperture |
| WO2014146038A1 (en) | 2013-03-15 | 2014-09-18 | Ruckus Wireless, Inc. | Low-band reflector for dual band directional antenna |
-
0
- BE BE373894D patent/BE373894A/xx unknown
- NL NL32443D patent/NL32443C/xx active
-
1929
- 1929-10-12 DE DEB146177D patent/DE571907C/en not_active Expired
- 1929-10-24 GB GB32351/29A patent/GB341568A/en not_active Expired
- 1929-11-14 US US407218A patent/US1869659A/en not_active Expired - Lifetime
-
1930
- 1930-10-07 FR FR703450D patent/FR703450A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2283882A (en) * | 1984-11-23 | 1995-05-17 | Marconi Co Ltd | Secure communication system |
| GB2283882B (en) * | 1984-11-23 | 1995-09-06 | Marconi Co Ltd | Communication system |
Also Published As
| Publication number | Publication date |
|---|---|
| NL32443C (en) | |
| BE373894A (en) | |
| US1869659A (en) | 1932-08-02 |
| DE571907C (en) | 1933-03-07 |
| FR703450A (en) | 1931-04-30 |
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