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GB1383174A - Rf microwave communications repeater systems - Google Patents

Rf microwave communications repeater systems

Info

Publication number
GB1383174A
GB1383174A GB5947771A GB5947771A GB1383174A GB 1383174 A GB1383174 A GB 1383174A GB 5947771 A GB5947771 A GB 5947771A GB 5947771 A GB5947771 A GB 5947771A GB 1383174 A GB1383174 A GB 1383174A
Authority
GB
United Kingdom
Prior art keywords
signal
frequency
amplifier
tunnel diode
bandpass filter
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
GB5947771A
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.)
International Microwave Corp
INT MICROWAVE CORP
Original Assignee
International Microwave Corp
INT MICROWAVE CORP
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 International Microwave Corp, INT MICROWAVE CORP filed Critical International Microwave Corp
Publication of GB1383174A publication Critical patent/GB1383174A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/155—Ground-based stations
    • H04B7/15528—Control of operation parameters of a relay station to exploit the physical medium

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Transmitters (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)

Abstract

1383174 Radio signalling: repeaters INTERNATIONAL MICROWAVE CORP 21 Dec 1971 59477/71 Heading H4L An r.f. repeater consists of an input bandpass filter 22 and a negative resistance amplifier 24, a frequency changer 28 followed by another bandpass filter 34 at the new frequency, and a chain of at least three tunnel diode amplifiers 24-1 to 24-4 driving a power amplifier 20. The tunnel diode amplifiers each has an associated circulator which, in the event of failure of an amplifier, passes the signal on to the next amplifier. The power amplifier is a travelling wave tube; or it may consist of one or two frequency lock oscillators which lock on to the signal to be amplified and transmitted by the antenna 12; alternatively Gunn or avalanche devices may be used. The frequency changer 28 is also a tunnel diode and receives the output of a local oscillator 30 at frequency f 2 , the shift of received signal frequency f 1 being f 2 or 2f 2 . The oscillator output may be phase modulated by a signal at 32 to insert an alarm or special order signal into the transmitted signal.
GB5947771A 1971-12-13 1971-12-21 Rf microwave communications repeater systems Expired GB1383174A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA129,936A CA957422A (en) 1971-12-13 1971-12-13 Straight-through r. f. microwave communications repeater system using tunnel diode amplifier for constant power output level

Publications (1)

Publication Number Publication Date
GB1383174A true GB1383174A (en) 1975-02-05

Family

ID=4091758

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5947771A Expired GB1383174A (en) 1971-12-13 1971-12-21 Rf microwave communications repeater systems

Country Status (4)

Country Link
AU (1) AU454768B2 (en)
CA (1) CA957422A (en)
FR (1) FR2164477B1 (en)
GB (1) GB1383174A (en)

Also Published As

Publication number Publication date
AU454768B2 (en) 1974-10-16
FR2164477B1 (en) 1976-12-03
FR2164477A1 (en) 1973-08-03
CA957422A (en) 1974-11-05
AU3697171A (en) 1973-06-21

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Legal Events

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