GB613902A - Improvements in and relating to repeater systems for high frequency electric waves - Google Patents

Improvements in and relating to repeater systems for high frequency electric waves

Info

Publication number
GB613902A
GB613902A GB1758147A GB1758147A GB613902A GB 613902 A GB613902 A GB 613902A GB 1758147 A GB1758147 A GB 1758147A GB 1758147 A GB1758147 A GB 1758147A GB 613902 A GB613902 A GB 613902A
Authority
GB
United Kingdom
Prior art keywords
frequency
produce
mixed
amplification
relating
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
GB1758147A
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.)
General Electric Co PLC
Original Assignee
General Electric Co PLC
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 General Electric Co PLC filed Critical General Electric Co PLC
Publication of GB613902A publication Critical patent/GB613902A/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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H04B7/2603—Arrangements for wireless physical layer control
    • H04B7/2606—Arrangements for base station coverage control, e.g. by using relays in tunnels

Abstract

613,902. Radio signalling. GENERAL ELECTRIC CO., Ltd., and GLADWIN, A. S. Jan. 21, 1946, No. 17581/47. Divided out of 613,854. [Classes 40 (v) and 40 (vi)] The invention relates to the means at radio repeater stations for converting the received frequency fc into a frequency fc+f1 for retransmission, and particularly to the type of which Fig. 2 is an example, in which fc is first mixed with a frequency fo to produce an intermediate frequency of fo -fc which after amplification at 3 is further mixed with a " shift " frequency f to produce a second intermediate frequency of fc -fo + f which is amplified at 6 and mixed with fo to produce the final frequency fc+f1 for retransmission. According to the invention, rejection of the unwanted products of the mixing is simplified by using an arrangement of which Fig. 4 is an example. Mixer 1 combines the signal fc with a frequency of fo+nf obtained from mixer 8 to produce an intermediate frequency of fo - fc+nf1, which after amplification is mixed with a frequency of mf (where (m - n)=1) to produce a second I.F. of (m-n)f1 - fo+fc. After further amplification, this frequency is mixed with fo to produce the final frequency fc+(m - n) f1. The frequencies mf, nf may be adjacent harmonics of a common oscillator. The application of the invention to a system handling two signals is described in Specification 613,854.
GB1758147A 1946-01-21 1946-01-21 Improvements in and relating to repeater systems for high frequency electric waves Expired GB613902A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB197246A GB613854A (en) 1946-01-21 1946-01-21 Improvements in and relating to repeater systems for high frequency electric waves

Publications (1)

Publication Number Publication Date
GB613902A true GB613902A (en) 1948-12-03

Family

ID=9731289

Family Applications (2)

Application Number Title Priority Date Filing Date
GB197246A Expired GB613854A (en) 1946-01-21 1946-01-21 Improvements in and relating to repeater systems for high frequency electric waves
GB1758147A Expired GB613902A (en) 1946-01-21 1946-01-21 Improvements in and relating to repeater systems for high frequency electric waves

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB197246A Expired GB613854A (en) 1946-01-21 1946-01-21 Improvements in and relating to repeater systems for high frequency electric waves

Country Status (1)

Country Link
GB (2) GB613854A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0227393A3 (en) * 1985-12-16 1988-11-02 Nippon Telegraph And Telephone Corporation Radio repeater with spillover measurement

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5625623A (en) * 1994-10-14 1997-04-29 Erilsson Ge Mobile Communications Inc. RF site communication link

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0227393A3 (en) * 1985-12-16 1988-11-02 Nippon Telegraph And Telephone Corporation Radio repeater with spillover measurement

Also Published As

Publication number Publication date
GB613854A (en) 1948-12-03

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