GB551472A - Improvements in modulated high frequency carrier wave signalling systems - Google Patents

Improvements in modulated high frequency carrier wave signalling systems

Info

Publication number
GB551472A
GB551472A GB1062141A GB1062141A GB551472A GB 551472 A GB551472 A GB 551472A GB 1062141 A GB1062141 A GB 1062141A GB 1062141 A GB1062141 A GB 1062141A GB 551472 A GB551472 A GB 551472A
Authority
GB
United Kingdom
Prior art keywords
frequency
oscillator
receiver
fed
heterodyne
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
GB1062141A
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.)
Pye Electronic Products Ltd
Original Assignee
Pye 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 Pye Ltd filed Critical Pye Ltd
Priority to GB1062141A priority Critical patent/GB551472A/en
Publication of GB551472A publication Critical patent/GB551472A/en
Expired legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B14/00Transmission systems not characterised by the medium used for transmission
    • H04B14/002Transmission systems not characterised by the medium used for transmission characterised by the use of a carrier modulation
    • H04B14/006Angle modulation
    • HELECTRICITY
    • H03BASIC ELECTRONIC CIRCUITRY
    • H03CMODULATION
    • H03C3/00Angle modulation
    • H03C3/02Details
    • H03C3/09Modifications of modulator for regulating the mean frequency

Abstract

551,472. Wireless receiving and transmitting apparatus. DALGLEISH, J. W., and PYE, Ltd. Aug. 20, 1941, No. 10621. [Class 40 (v)] A combined transmitter and receiver comprises a stable oscillator producing a series of discrete harmonic frequencies, a receiver of the super-heterodyne type of which heterodyne oscillations comprise or are locked in synchronism with any selected one of the harmonics of the stable oscillator, and a transmitter of which the sending frequency is controlled in relation to the frequency of the said heterodyne oscillations by means of an automatic frequency control circuit, so that the sending frequency and the heterodyne frequency differ by the amount of the intermediate frequency of the receiver. The invention is shown applied to a combined transmitter and receiver for frequency modulated carrier signals. Signals received on aerial A<1> are amplified at 5 and fed to a mixer 4, amplifier 6, limiter 7, discriminator and demodulator 8 followed by audio and output stages 9, 10 and telephones T. The mixer 4 is fed by a local oscillator 3 whose frequency is controlled by the output of an amplifier 2 which selects harmonics of a crystalcontrolled multi-vibrator of other stable oscillator 1. By making the fundamental frequency of 1 equal to the separation of the signal channels, e.g. 10 kcs., successive harmonics will provide a suitable oscillator frequency for neighbouring channels. The transmitter comprises a microphone M, reactance modulator 16, oscillator 11, limiter and buffer 12, power amplifier 13 and transmitting aerial A<2>. In order to use the controlled oscillator 1 to control the frequency of transmission, a voltage from 11 is fed to the mixer 4 and the D.C. voltage from the discriminator 8 is fed to the reactance modulator 16 to lock oscillator 11 to the frequency to which the receiver is tuned.
GB1062141A 1941-08-20 1941-08-20 Improvements in modulated high frequency carrier wave signalling systems Expired GB551472A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1062141A GB551472A (en) 1941-08-20 1941-08-20 Improvements in modulated high frequency carrier wave signalling systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1062141A GB551472A (en) 1941-08-20 1941-08-20 Improvements in modulated high frequency carrier wave signalling systems

Publications (1)

Publication Number Publication Date
GB551472A true GB551472A (en) 1943-02-24

Family

ID=9971229

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1062141A Expired GB551472A (en) 1941-08-20 1941-08-20 Improvements in modulated high frequency carrier wave signalling systems

Country Status (1)

Country Link
GB (1) GB551472A (en)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2460781A (en) * 1943-10-07 1949-02-01 Rca Corp Circuit for stabilizing frequencies of transmitter-receiver systems
US2477039A (en) * 1944-01-05 1949-07-26 Hartford Nat Bank & Trust Co Transceiver circuit arrangement
US2505670A (en) * 1947-11-28 1950-04-25 Raytheon Mfg Co Transceiver for multichannel radio communication systems
US2529550A (en) * 1944-07-27 1950-11-14 Rca Corp Two-way radio communication system
US2537972A (en) * 1944-08-11 1951-01-16 Collins Radio Co Radio communication transmitting and receiving combination
US2550519A (en) * 1946-06-12 1951-04-24 Fr Des Telecomm Soc Radio transmitter-receiver station with automatic frequency control
US2558790A (en) * 1946-04-01 1951-07-03 Cecil E Smith Local oscillator frequency control for superheterodyne receivers and control devices
US2577520A (en) * 1945-07-09 1951-12-04 Donald G C Hare Radio-frequency transponder
US2587590A (en) * 1946-07-26 1952-03-04 Sperry Corp Ultrahigh-frequency apparatus
US2644077A (en) * 1945-12-06 1953-06-30 Us Sec War Automatic frequency control for receiver-transmitter
US2748284A (en) * 1952-07-31 1956-05-29 Raytheon Mfg Co Reactance modulator circuits
DE1155828B (en) * 1955-08-29 1963-10-17 Int Standard Electric Corp Wireless transceiver station tunable over a predetermined frequency range

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2460781A (en) * 1943-10-07 1949-02-01 Rca Corp Circuit for stabilizing frequencies of transmitter-receiver systems
US2477039A (en) * 1944-01-05 1949-07-26 Hartford Nat Bank & Trust Co Transceiver circuit arrangement
US2529550A (en) * 1944-07-27 1950-11-14 Rca Corp Two-way radio communication system
US2537972A (en) * 1944-08-11 1951-01-16 Collins Radio Co Radio communication transmitting and receiving combination
US2577520A (en) * 1945-07-09 1951-12-04 Donald G C Hare Radio-frequency transponder
US2644077A (en) * 1945-12-06 1953-06-30 Us Sec War Automatic frequency control for receiver-transmitter
US2558790A (en) * 1946-04-01 1951-07-03 Cecil E Smith Local oscillator frequency control for superheterodyne receivers and control devices
US2550519A (en) * 1946-06-12 1951-04-24 Fr Des Telecomm Soc Radio transmitter-receiver station with automatic frequency control
US2587590A (en) * 1946-07-26 1952-03-04 Sperry Corp Ultrahigh-frequency apparatus
US2505670A (en) * 1947-11-28 1950-04-25 Raytheon Mfg Co Transceiver for multichannel radio communication systems
US2748284A (en) * 1952-07-31 1956-05-29 Raytheon Mfg Co Reactance modulator circuits
DE1155828B (en) * 1955-08-29 1963-10-17 Int Standard Electric Corp Wireless transceiver station tunable over a predetermined frequency range

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