GB556171A - Improvements in frequency divider networks, particularly for frequency or phase modulation receivers - Google Patents

Improvements in frequency divider networks, particularly for frequency or phase modulation receivers

Info

Publication number
GB556171A
GB556171A GB4109/42A GB410942A GB556171A GB 556171 A GB556171 A GB 556171A GB 4109/42 A GB4109/42 A GB 4109/42A GB 410942 A GB410942 A GB 410942A GB 556171 A GB556171 A GB 556171A
Authority
GB
United Kingdom
Prior art keywords
frequency
valve
phase modulation
march
modulation receivers
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
GB4109/42A
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.)
Marconis Wireless Telegraph Co Ltd
BAE Systems Electronics Ltd
Original Assignee
Marconis Wireless Telegraph Co Ltd
Marconi Co Ltd
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 Marconis Wireless Telegraph Co Ltd, Marconi Co Ltd filed Critical Marconis Wireless Telegraph Co Ltd
Publication of GB556171A publication Critical patent/GB556171A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C3/00—Angle modulation
    • H03C3/02—Details
    • H03C3/06—Means for changing frequency deviation

Landscapes

  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)

Abstract

556,171. Valve generating circuits. MARCONI'S WIRELESS TELEGRAPH CO., Ltd. March 27, 1942, No. 4109. Convention date, March 29, 1941. [Class 40 (v)] A frequency divider particularly for frequency or phase modulation receivers consists in an arrangement for heterodyning the input frequency with a frequency differing therefrom by the desired sub-multiple which is obtained by frequency multiplication from the desired sub-multiple and is so arranged that no output is produced in the absence of an input frequency. The Figure shows a frequency changer 4 fed with a signal which may be 4 Mc and a local oscillation which may be 5 Mc from a circuit 40, 41. The latter is obtained from the intermediate frequency which in this case is 1 Mc by frequency multiplication in the valve 20. The valve 20 may be biased near cut-off when the amplitude of the signal is below threshold value to obviate noise in the output and the network may in addition perform the function of a limiter. U.S.A. Specifications 2,064,106 and 2,230,231 are referred to.
GB4109/42A 1941-03-29 1942-03-27 Improvements in frequency divider networks, particularly for frequency or phase modulation receivers Expired GB556171A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US556171XA 1941-03-29 1941-03-29

Publications (1)

Publication Number Publication Date
GB556171A true GB556171A (en) 1943-09-22

Family

ID=21999047

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4109/42A Expired GB556171A (en) 1941-03-29 1942-03-27 Improvements in frequency divider networks, particularly for frequency or phase modulation receivers

Country Status (1)

Country Link
GB (1) GB556171A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1087642B (en) * 1958-06-28 1960-08-25 Standard Elektrik Lorenz Ag Backmix divider

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1087642B (en) * 1958-06-28 1960-08-25 Standard Elektrik Lorenz Ag Backmix divider

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