GB559290A - Frequency modulation receiver - Google Patents

Frequency modulation receiver

Info

Publication number
GB559290A
GB559290A GB16807/42A GB1680742A GB559290A GB 559290 A GB559290 A GB 559290A GB 16807/42 A GB16807/42 A GB 16807/42A GB 1680742 A GB1680742 A GB 1680742A GB 559290 A GB559290 A GB 559290A
Authority
GB
United Kingdom
Prior art keywords
resistances
grids
grid
circuits
valves
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
GB16807/42A
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.)
BAE Systems Electronics Ltd
Original Assignee
Marconis Wireless Telegraph 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 filed Critical Marconis Wireless Telegraph Co Ltd
Publication of GB559290A publication Critical patent/GB559290A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G11/00—Limiting amplitude; Limiting rate of change of amplitude ; Clipping in general
    • H03G11/06—Limiters of angle-modulated signals; such limiters combined with discriminators
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/16—Circuits
    • H04B1/26—Circuits for superheterodyne receivers

Abstract

559,290. Frequency modulation. MARCONI'S WIRELESS TELEGRAPH CO., Ltd. Nov. 26, 1942, No. 16807. Convention date, Nov. 27, 1941. [Class 40 (v)] In a frequency modulation receiver, the load resistances of the balanced discriminator rectifiers are connected in the grid circuits of amplifying valves which have their anode output circuits associated in push-pull relation ; and the grid circuits are arranged to give an approximately logarithmic relation between input volts and anode current. The Circuit serves to eliminate amplitude modulation effects without using a limiter. As shown, the discriminator is fed from the I.F. stage 5 and includes off-tune circuits 7, 8 connected to rectifiers 15, 16 and load resistances 13, 14, the junction of which is earthed and the positive outer ends connected to the grids of the respective amplifiers 22, 23. The anodes are associated in push-pull relation with a subsequent AF stage, the HT current being fed to a centre tapping on the transformer 25, or an indirect feed may be employed with capacities inserted between the anodes and the transformer. Automatic volume control is provided by connecting the rectifier cathodes through resistances 17, 18, smoothing condenser 19, polarity-reversing amplifier 19' to the grids of the early stages of the set. A non-linear relationship between input voltage and anode current in the valves 22, 23 is ensured by series resistances 20, 21 which owing to the flow of grid current absorb part of the input voltage. In a modification shown in Fig. 3, the grids of the AF amplifiers 48, 49 are connected to earth through triode valves 22, 23 which cause a further drop of voltage in the grid resistors 44, 45. The grids of the triodes 22, 23 are connected through resistances 20, 21 to the ends of the rectifier load resistances 13, 14.
GB16807/42A 1941-11-27 1942-11-26 Frequency modulation receiver Expired GB559290A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US420661A US2349881A (en) 1941-11-27 1941-11-27 Frequency modulation receiver

Publications (1)

Publication Number Publication Date
GB559290A true GB559290A (en) 1944-02-11

Family

ID=23667348

Family Applications (1)

Application Number Title Priority Date Filing Date
GB16807/42A Expired GB559290A (en) 1941-11-27 1942-11-26 Frequency modulation receiver

Country Status (2)

Country Link
US (1) US2349881A (en)
GB (1) GB559290A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2458364A (en) * 2008-03-07 2009-09-23 Archibald Mcgilvray Pettigrew FM demodulator with no requirement for limiter circuit

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2422083A (en) * 1942-03-20 1947-06-10 Rca Corp Frequency modulation receiver
GB573348A (en) * 1943-11-05 1945-11-16 Bertram Morton Hadfield Improvements in or relating to thermionic valve circuits
US2478977A (en) * 1944-11-13 1949-08-16 Colonial Radio Corp Signal seeking receiver for frequency modulated signals
US2519890A (en) * 1944-12-09 1950-08-22 Rca Corp Angle modulated wave receiver
US2446077A (en) * 1945-05-02 1948-07-27 Press Wireless Inc Frequency-shift telegraph system
US2576249A (en) * 1947-08-28 1951-11-27 Bell Telephone Labor Inc Level ratio measuring system
US3044018A (en) * 1959-01-21 1962-07-10 Wilson John Orr Frequency drift detection apparatus
US3168738A (en) * 1961-06-06 1965-02-02 Philco Corp Selective-frequency remote control system having spurious noise signal suppression

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2458364A (en) * 2008-03-07 2009-09-23 Archibald Mcgilvray Pettigrew FM demodulator with no requirement for limiter circuit

Also Published As

Publication number Publication date
US2349881A (en) 1944-05-30

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