IT1037310B - Satellite telephone system - uses frequency synthesiser and central control station - Google Patents

Satellite telephone system - uses frequency synthesiser and central control station

Info

Publication number
IT1037310B
IT1037310B IT2240775A IT2240775A IT1037310B IT 1037310 B IT1037310 B IT 1037310B IT 2240775 A IT2240775 A IT 2240775A IT 2240775 A IT2240775 A IT 2240775A IT 1037310 B IT1037310 B IT 1037310B
Authority
IT
Italy
Prior art keywords
speech
channels
output
telephone system
satellite telephone
Prior art date
Application number
IT2240775A
Other languages
Italian (it)
Inventor
B G Haglund
N H Edstrom
Original Assignee
Ericsson Telefon Ab L M
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
Priority claimed from SE7405276A external-priority patent/SE373997B/xx
Priority claimed from SE7405277A external-priority patent/SE373998B/xx
Priority claimed from SE7405280A external-priority patent/SE373999B/xx
Priority claimed from SE7405279A external-priority patent/SE377016B/xx
Application filed by Ericsson Telefon Ab L M filed Critical Ericsson Telefon Ab L M
Application granted granted Critical
Publication of IT1037310B publication Critical patent/IT1037310B/en

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  • Radio Relay Systems (AREA)

Abstract

This synchronous satellite telephone system relays multiple signalling channels and multiple single way speech channels which share two way channels to low traffic density ground stations (1) which comprise line equipments connected to the subscribers (4, 5). Each line equipment has an input for received speech, an output for signalling and a second output for speech and subscriber identification. A frequency synthesizer acts upon the speech output and ensures proper connection to the two way channels. Identification decoders are located in the control exchange (2). Other high traffic density ground stations (3) are connected to the exchange via a ground network. This system gives, to zones that have a low population, telephony at an economic price.
IT2240775A 1974-04-19 1975-04-16 Satellite telephone system - uses frequency synthesiser and central control station IT1037310B (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
SE7405276A SE373997B (en) 1974-04-19 1974-04-19
SE7405277A SE373998B (en) 1974-04-19 1974-04-19
SE7405280A SE373999B (en) 1974-04-19 1974-04-19
SE7405279A SE377016B (en) 1974-04-19 1974-04-19

Publications (1)

Publication Number Publication Date
IT1037310B true IT1037310B (en) 1979-11-10

Family

ID=27484592

Family Applications (1)

Application Number Title Priority Date Filing Date
IT2240775A IT1037310B (en) 1974-04-19 1975-04-16 Satellite telephone system - uses frequency synthesiser and central control station

Country Status (2)

Country Link
JP (1) JPS50147210A (en)
IT (1) IT1037310B (en)

Also Published As

Publication number Publication date
JPS50147210A (en) 1975-11-26

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