GB563490A - Improvements in apparatus for receiving as desired frequency or amplitude modulated carrier wave signals - Google Patents

Improvements in apparatus for receiving as desired frequency or amplitude modulated carrier wave signals

Info

Publication number
GB563490A
GB563490A GB2205/43A GB220543A GB563490A GB 563490 A GB563490 A GB 563490A GB 2205/43 A GB2205/43 A GB 2205/43A GB 220543 A GB220543 A GB 220543A GB 563490 A GB563490 A GB 563490A
Authority
GB
United Kingdom
Prior art keywords
receiving
rectifiers
impedances
reception
voltages
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
GB2205/43A
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 GB563490A publication Critical patent/GB563490A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D1/00—Demodulation of amplitude-modulated oscillations
    • H03D1/14—Demodulation of amplitude-modulated oscillations by means of non-linear elements having more than two poles
    • H03D1/16—Demodulation of amplitude-modulated oscillations by means of non-linear elements having more than two poles of discharge tubes
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D5/00—Circuits for demodulating amplitude-modulated or angle-modulated oscillations at will

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Circuits Of Receivers In General (AREA)
  • Superheterodyne Receivers (AREA)
  • Amplifiers (AREA)

Abstract

563,490. Frequency and phase modulation. MARCONI'S WIRELESS TELEGRAPH CO., Ltd. Feb. 10, 1943, No. 2205. Convention date, Feb. 10, 1942. [Class 40 (v)] A circuit for the alternative reception of F.M. or A.M. waves comprises a balanced discriminator associated with a pair of rectifiers, and a switch is arranged to take off push-pull audio voltages either across a balanced pair of impedances for F.M. reception, or across anode and cathode impedances common to both rectifiers for A.M. reception. The intermediate frequency is supplied to a discriminator of the phasing type comprising coupled tuned circuits 1, 2 and 4,' 5 and the secondary voltages are applied to the grids of grid-leak rectifiers 10, 11. The valve anodes are connected to impedances 12, 13, the junction of which is connected to B + through a resistance 16. For receiving F.M. signals, push-pull audio voltages are taken off by switching the arms 22, 23 to terminals FM connected to the valve anodes. For receiving A.M. signals, the switch arms are moved to contacts AM so as to pick up pushpull audio voltages from across the cathode impedance .18 and the anode impedance 16 respectively. Specification 562,315 is referred to.
GB2205/43A 1942-02-10 1943-02-10 Improvements in apparatus for receiving as desired frequency or amplitude modulated carrier wave signals Expired GB563490A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US430171A US2351212A (en) 1942-02-10 1942-02-10 Convertible demodulator circuit

Publications (1)

Publication Number Publication Date
GB563490A true GB563490A (en) 1944-08-16

Family

ID=23706352

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2205/43A Expired GB563490A (en) 1942-02-10 1943-02-10 Improvements in apparatus for receiving as desired frequency or amplitude modulated carrier wave signals

Country Status (2)

Country Link
US (1) US2351212A (en)
GB (1) GB563490A (en)

Families Citing this family (7)

* 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
US2634369A (en) * 1947-06-26 1953-04-07 Standard Coil Prod Co Inc Detector for frequency modulation receivers
US2588031A (en) * 1947-11-01 1952-03-04 Gen Railway Signal Co Radio communication system
US2644084A (en) * 1948-09-02 1953-06-30 Gen Railway Signal Co Discriminator improvement to reduce audio-frequency noise
US2676262A (en) * 1950-03-29 1954-04-20 Hartford Nat Bank & Trust Co Automatic frequency control system for oscillators
US3021424A (en) * 1952-08-30 1962-02-13 Sperry Rand Corp Automatic frequency control system
NL185262B (en) * 1953-02-24 Yoshida Kogyo Kk ZIPPER WITH A METAL TOP STOP BRIDGE ATTACHED TO THE TOP ENDS OF THE STRAP.

Also Published As

Publication number Publication date
US2351212A (en) 1944-06-13

Similar Documents

Publication Publication Date Title
GB582766A (en) Combined transmitter and receiver for radio signalling
GB563490A (en) Improvements in apparatus for receiving as desired frequency or amplitude modulated carrier wave signals
GB638423A (en) Improvements relating to radio receivers capable of selectively receiving angle modulated or amplitude modulated carrier waves and to detector circuits for use therein
GB617254A (en) Improvements in diversity radio receiving systems
GB606007A (en) Improvements in angle modulation detectors for carrier wave signalling
GB454257A (en) Improvements in or relating to modulated carrier wave receivers
GB542005A (en) Improvements in radio transmission systems
GB481888A (en) Improvements relating to frequency selective systems and to systems for the reception of frequency-modulated waves
GB662245A (en) Diversity receiver apparatus
GB534723A (en) Improvements in or relating to receivers for frequency or phase modulated oscillations
GB571580A (en) Frequency modulation detector
GB636375A (en) Improvements in or relating to circuits for receiving frequency-modulated oscillations
GB1051619A (en)
GB896688A (en) Improvements in or relating to frequency discriminators
GB562325A (en) Improvements in or relating to thermionic valve circuits
GB515106A (en) Improvements in or relating to modulator carrier wave transmitters
GB656295A (en)
GB400897A (en) Improvements in or relating to ultra short wave receiving systems and thermionic valves for use therein
GB170154A (en) Improvements in continuous wave telephony and telegraphy
GB257294A (en) Improvements in or relating to radio receivers
GB433863A (en) Improvements in or relating to thermionic valve demodulating arrangements for amplitude modulated carrier wave oscillations
GB707644A (en) Improvements in or relating to tuned thermionic valve amplifiers
GB557105A (en) Switching arrangement for circuits carrying radio-frequency energy
GB394186A (en) Improvements in or relating to electrical modulation systems
GB587553A (en) Improvements in circuit arrangements for use with widely-separated frequency bands