GB972389A - Improvements in or relating to single-sideband transmitters - Google Patents

Improvements in or relating to single-sideband transmitters

Info

Publication number
GB972389A
GB972389A GB2249062A GB2249062A GB972389A GB 972389 A GB972389 A GB 972389A GB 2249062 A GB2249062 A GB 2249062A GB 2249062 A GB2249062 A GB 2249062A GB 972389 A GB972389 A GB 972389A
Authority
GB
United Kingdom
Prior art keywords
modulation
carrier
phase
ssb
output
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
GB2249062A
Inventor
Stanley Howard Bowers
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.)
SECR AVIATION
Minister of Aviation
Original Assignee
SECR AVIATION
Minister of Aviation
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 SECR AVIATION, Minister of Aviation filed Critical SECR AVIATION
Priority to GB2249062A priority Critical patent/GB972389A/en
Publication of GB972389A publication Critical patent/GB972389A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C1/00—Amplitude modulation
    • H03C1/52—Modulators in which carrier or one sideband is wholly or partially suppressed
    • H03C1/60—Modulators in which carrier or one sideband is wholly or partially suppressed with one sideband wholly or partially suppressed

Landscapes

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

Abstract

972,389. Single sideband amplitude modulators; automatic phase control systems. MINISTER OF AVIATION. June 7, 1963 [June 12, 1962], No. 22490/62. Drawings to Specification. Headings H3A and H3R. In an SSB transmitter, a master oscillator is by a phase-locked loop including a frequencychanging stage, controlled to follow in phase, by a phase discriminator, the instantaneous phase modulation of the SSB carrier after limiting, then its output amplitude modulated by the detected amplitude modulation of the SSB carrier. The output may be therefore adjusted in frequency, continuously or in steps, by adjusting the frequency changer local oscillator or selecting one of several crystalcontrolled local oscillators. The detected amplitude modulation may be adjusted in phase by a network before application to the modulation state, e.g. a Class C type, preceded by a Class C carrier amplifier. If the SSB carrier is derived by a filter from a balanced modulator and since the master oscillator will not then be locked to any carrier during absence of modulation, a small carrier frequency component may be included in the output of the SSB filter; or a low amplitude tone signal in the centre of the speech band may be continuously present in the modulation input.
GB2249062A 1962-06-12 1962-06-12 Improvements in or relating to single-sideband transmitters Expired GB972389A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2249062A GB972389A (en) 1962-06-12 1962-06-12 Improvements in or relating to single-sideband transmitters

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2249062A GB972389A (en) 1962-06-12 1962-06-12 Improvements in or relating to single-sideband transmitters

Publications (1)

Publication Number Publication Date
GB972389A true GB972389A (en) 1964-10-14

Family

ID=10180253

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2249062A Expired GB972389A (en) 1962-06-12 1962-06-12 Improvements in or relating to single-sideband transmitters

Country Status (1)

Country Link
GB (1) GB972389A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2155711A (en) * 1984-03-13 1985-09-25 Alcatel Thomson Faisceaux Ultrahigh frequency active filter

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2155711A (en) * 1984-03-13 1985-09-25 Alcatel Thomson Faisceaux Ultrahigh frequency active filter

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