GB1293816A - Improvements in or relating to radiotelephony systems - Google Patents

Improvements in or relating to radiotelephony systems

Info

Publication number
GB1293816A
GB1293816A GB5133570A GB5133570A GB1293816A GB 1293816 A GB1293816 A GB 1293816A GB 5133570 A GB5133570 A GB 5133570A GB 5133570 A GB5133570 A GB 5133570A GB 1293816 A GB1293816 A GB 1293816A
Authority
GB
United Kingdom
Prior art keywords
station
stations
oct
transmitted
accordance
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
Application number
GB5133570A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Publication of GB1293816A publication Critical patent/GB1293816A/en
Expired legal-status Critical Current

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

Abstract

1293816 Radio signalling SIEMENS AG 29 Oct 1970 [30 Oct 1969] 51335/70 Heading H4L In a radiotelephony system comprising a plurality of stations in which a plurality of discrete frequencies are allotted to each station and are changed in accordance with a predetermined schedule, each station is provided with an electronic computer having a storage device which contains the frequency-changing schedule for all stations of the system and is also provided with a time-measuring device which controls the computer in such manner that the times of frequency switch-over in a particular station are determined by that station's own time measuring device. The stations may be mobile and the information signals may be transmitted by P.C.M. A special carrier likewise changed in accordance with a predetermined programme may be transmitted from a central station to effect synchronization of the time measuring devices. Means may be provided for measuring the transmission quality and to transmit at a reduced information rate if the transmission conditions are unfavourable.
GB5133570A 1969-10-30 1970-10-29 Improvements in or relating to radiotelephony systems Expired GB1293816A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19691954754 DE1954754C3 (en) 1969-10-30 1969-10-30 Radio telephony system that works with encryption of the message signals to be transmitted

Publications (1)

Publication Number Publication Date
GB1293816A true GB1293816A (en) 1972-10-25

Family

ID=5749741

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5133570A Expired GB1293816A (en) 1969-10-30 1970-10-29 Improvements in or relating to radiotelephony systems

Country Status (11)

Country Link
AT (1) AT310815B (en)
BE (1) BE758279A (en)
CH (1) CH514963A (en)
DE (1) DE1954754C3 (en)
DK (1) DK132049C (en)
FR (1) FR2066593A5 (en)
GB (1) GB1293816A (en)
LU (1) LU61951A1 (en)
NL (1) NL149671B (en)
NO (1) NO131813C (en)
SE (1) SE368758B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2573216A1 (en) * 1977-08-22 1986-05-16 Siemens Ag Military system for transmitting information by radar or by radio-communication

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2245646A1 (en) * 1972-09-16 1974-03-21 Bosch Elektronik Gmbh SYSTEM FOR TELEPHONE COMMUNICATION
DE2550592C1 (en) * 1975-11-11 1990-12-06 Siemens Ag Radio system
DE2650823A1 (en) * 1976-11-06 1978-05-11 Licentia Gmbh Radio communications system with fixed and mobile stations - uses available channels to max. capacity to form connections quickly
DE2737576C1 (en) * 1977-08-22 1986-01-09 Siemens AG, 1000 Berlin und 8000 München Military radar or radio communications system
DE2747454C1 (en) * 1977-10-24 1992-09-24 Siemens Ag Message transfer system with frequency hopping
DE2943059C2 (en) * 1979-10-25 1984-01-05 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Radio system with synchronization of the subscriber facilities
FR2640448B1 (en) * 1980-10-13 1992-01-03 Trt Telecom Radio Electr NETWORK-BASED INFORMATION TRANSMISSION SYSTEM USING FREQUENCY HOPPING A SET OF CHANNELS
FR2527872A1 (en) * 1982-05-27 1983-12-02 Thomson Csf FIXED STATION OF A RADIOCOMMUNICATION SYSTEM WITH FREQUENCY HOPPING AND BANALIZED TRANSMITTERS
FR2527871B1 (en) * 1982-05-27 1986-04-11 Thomson Csf RADIOCOMMUNICATION SYSTEM, FREQUENCY HOPPING
DE3601372C2 (en) * 1986-01-18 1994-04-28 Deutsche Aerospace Direction finding and location system for transmitter location with frequency hopping radio connections

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2573216A1 (en) * 1977-08-22 1986-05-16 Siemens Ag Military system for transmitting information by radar or by radio-communication

Also Published As

Publication number Publication date
AT310815B (en) 1973-10-25
DE1954754A1 (en) 1971-05-06
SE368758B (en) 1974-07-15
DE1954754C3 (en) 1975-08-07
NO131813C (en) 1975-08-06
NO131813B (en) 1975-04-28
CH514963A (en) 1971-10-31
DE1954754B2 (en) 1974-12-19
NL149671B (en) 1976-05-17
NL7015745A (en) 1971-05-04
DK132049C (en) 1976-03-08
LU61951A1 (en) 1971-05-10
BE758279A (en) 1971-04-30
FR2066593A5 (en) 1971-08-06
DK132049B (en) 1975-10-13

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee