GB653288A - Improvements in or relating to electric amplifying systems for frequency modulated carrier waves - Google Patents

Improvements in or relating to electric amplifying systems for frequency modulated carrier waves

Info

Publication number
GB653288A
GB653288A GB2383648A GB2383648A GB653288A GB 653288 A GB653288 A GB 653288A GB 2383648 A GB2383648 A GB 2383648A GB 2383648 A GB2383648 A GB 2383648A GB 653288 A GB653288 A GB 653288A
Authority
GB
United Kingdom
Prior art keywords
frequency
relating
carrier waves
frequency modulated
modulated carrier
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
GB2383648A
Inventor
Arthur Tisso Starr
Harry Grayson
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.)
STC PLC
Original Assignee
Standard Telephone and Cables 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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB2383648A priority Critical patent/GB653288A/en
Publication of GB653288A publication Critical patent/GB653288A/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
    • H04B7/165—Ground-based stations employing angle modulation

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Radio Relay Systems (AREA)

Abstract

653,288. Automatic frequency control systems. STANDARD TELEPHONES & CABLES, Ltd. Sept. 10, 1948, No. 23836. Drawings to Specification. [Class 38 (iv)] In a signal repeater for F.M. waves the instantaneous frequency difference between the received and transmitted waves is maintained constant by mixing them and deriving from one side band by a discriminator a control voltage acting retroactively on the transmitter. The control voltage may be combined with the demodulated signal from the receiver and both applied to vary an electrode potential of a velocity modulation tube. The mixed frequency may be reduced in frequency by an oscillator before application to the frequency variation discriminator.
GB2383648A 1948-09-10 1948-09-10 Improvements in or relating to electric amplifying systems for frequency modulated carrier waves Expired GB653288A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2383648A GB653288A (en) 1948-09-10 1948-09-10 Improvements in or relating to electric amplifying systems for frequency modulated carrier waves

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2383648A GB653288A (en) 1948-09-10 1948-09-10 Improvements in or relating to electric amplifying systems for frequency modulated carrier waves

Publications (1)

Publication Number Publication Date
GB653288A true GB653288A (en) 1951-05-09

Family

ID=10202090

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2383648A Expired GB653288A (en) 1948-09-10 1948-09-10 Improvements in or relating to electric amplifying systems for frequency modulated carrier waves

Country Status (1)

Country Link
GB (1) GB653288A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2820138A (en) * 1953-10-19 1958-01-14 Ericsson Telefon Ab L M Relay station for transmitting frequency modulated signals
DE1046702B (en) * 1956-03-06 1958-12-18 Int Standard Electric Corp Message transmission system
US3180938A (en) * 1960-07-07 1965-04-27 Itt Repeater terminal for frequency division multiplex communication systems

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2820138A (en) * 1953-10-19 1958-01-14 Ericsson Telefon Ab L M Relay station for transmitting frequency modulated signals
DE1046702B (en) * 1956-03-06 1958-12-18 Int Standard Electric Corp Message transmission system
US3180938A (en) * 1960-07-07 1965-04-27 Itt Repeater terminal for frequency division multiplex communication systems

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