GB448448A - Improvements in or relating to modulated carrier wave receivers - Google Patents

Improvements in or relating to modulated carrier wave receivers

Info

Publication number
GB448448A
GB448448A GB35113/34A GB3511334A GB448448A GB 448448 A GB448448 A GB 448448A GB 35113/34 A GB35113/34 A GB 35113/34A GB 3511334 A GB3511334 A GB 3511334A GB 448448 A GB448448 A GB 448448A
Authority
GB
United Kingdom
Prior art keywords
frequency
fed
divided
phase
transformer
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
GB35113/34A
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 GB448448A publication Critical patent/GB448448A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D3/00—Demodulation of angle-, frequency- or phase- modulated oscillations
    • H03D3/001—Details of arrangements applicable to more than one type of frequency demodulator
    • H03D3/003—Arrangements for reducing frequency deviation, e.g. by negative frequency feedback
    • H03D3/004—Arrangements for reducing frequency deviation, e.g. by negative frequency feedback wherein the demodulated signal is used for controlling an oscillator, e.g. the local oscillator

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Superheterodyne Receivers (AREA)
  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)

Abstract

448,448. Wireless receiving systems. MARCONI'S WIRELESS TELEGRAPH CO., Ltd., Electra House, Victoria Embankment, London.-(Assignees of Crosby, M. G.; Riverhead, Long Island, New York, U.S.A.) Dec. 6, 1934, No. 35113. Convention date, Dec. 27, 1933. [Class 40 (v)] Relates to receivers for phase or frequency modulated carrier waves and comprises dividing the received energy into two portions the degree of modulation of one portion being reduced by frequency division before combination with the other portion in correct relative phase to produce amplitude modulation. In one embodiment, Fig. 1, the energy from the aerial A passes to a radio frequency amplifier 1, frequency changer 2, intermediate frequency amplifier 3 and amplitude limiter 4, the output from which is divided into two portions. One portion is fed to a multi-vibrator frequency divider 5, the circuit of which is shown in Fig. 5, the divided frequency being restored to the original intermediate frequency by a heterodyne frequency changer 6, passed to phase adjusters 7, 14 and fed in push pull through transformer 15, to detector valves 17, 18. The other portion of the divided output from the limiter 4 is fed in parallel to these valves through transformer 16, the outputs from the valves, one of which may be reversed in phase by the switch 19, being combined in the transformer 20 feeding the utilization means 21. A further pair of detectors 8, 9 similarly fed produce potentials which are applied to control the frequency of the local oscillator of the frequency changer 2. The receiver may be adapted to receive amplitude modulated signals by placing the switches S, S1 in their second position which applies the output direct from the amplifier 3 to the detectors. In a second embodiment, Fig. 4 (not shown), the portion of the signals which is divided in frequency is not reconverted to the intermediate frequency but is combined with a second portion which is reduced to the same frequency by heterodyning. U.S.A. Specification 616,803 is referred to.
GB35113/34A 1933-12-27 1934-12-06 Improvements in or relating to modulated carrier wave receivers Expired GB448448A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US704122A US2064106A (en) 1933-12-27 1933-12-27 Receiver

Publications (1)

Publication Number Publication Date
GB448448A true GB448448A (en) 1936-06-08

Family

ID=24828163

Family Applications (1)

Application Number Title Priority Date Filing Date
GB35113/34A Expired GB448448A (en) 1933-12-27 1934-12-06 Improvements in or relating to modulated carrier wave receivers

Country Status (3)

Country Link
US (1) US2064106A (en)
DE (1) DE662107C (en)
GB (1) GB448448A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1015501B (en) * 1956-03-27 1957-09-12 Siemens Ag Circuit for obtaining a frequency adjustment voltage for receivers to receive frequency-keyed telegraph characters

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2465782A (en) * 1943-01-30 1949-03-29 Gen Electric Frequency modulation receiver
DE1271809B (en) * 1955-02-20 1968-07-04 Bendix Corp Phase sensitive magnetic amplifier device
NL242278A (en) * 1958-08-14
DE1199337B (en) * 1959-02-04 1965-08-26 Peter G S Mero Phase discriminator

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1015501B (en) * 1956-03-27 1957-09-12 Siemens Ag Circuit for obtaining a frequency adjustment voltage for receivers to receive frequency-keyed telegraph characters

Also Published As

Publication number Publication date
DE662107C (en) 1938-07-05
US2064106A (en) 1936-12-15

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