GB661957A - Improvements relating to amplitude modulated radio transmitters - Google Patents

Improvements relating to amplitude modulated radio transmitters

Info

Publication number
GB661957A
GB661957A GB29476/48A GB2947648A GB661957A GB 661957 A GB661957 A GB 661957A GB 29476/48 A GB29476/48 A GB 29476/48A GB 2947648 A GB2947648 A GB 2947648A GB 661957 A GB661957 A GB 661957A
Authority
GB
United Kingdom
Prior art keywords
amplifier
resistor
modulator
transmitter
unwanted harmonics
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
GB29476/48A
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.)
Metropolitan Vickers Electrical Co Ltd
Original Assignee
Metropolitan Vickers Electrical 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 Metropolitan Vickers Electrical Co Ltd filed Critical Metropolitan Vickers Electrical Co Ltd
Publication of GB661957A publication Critical patent/GB661957A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C1/00—Amplitude modulation
    • H03C1/02—Details
    • H03C1/06—Modifications of modulator to reduce distortion, e.g. by feedback, and clearly applicable to more than one type of modulator

Landscapes

  • Transmitters (AREA)

Abstract

661,957. Modulating apparatus; valve amplifying circuits. METROPOLITAN-VICKERS ELECTRICAL CO., Ltd. Nov. 12, 1948 [Nov. 17, 1947], No. 29476/48. Classes 40 (v) and 40 (vi). The final low-frequency amplifier of a radio transmitter is coupled to the modulator through a circuit arranged to filter off unwanted harmonics of the audio signals to an auxiliary loading resistor, and to present a substantially constant impedance to the amplifier over the useful audio frequency range. As shown, the final L.F. amplifier 3 is coupled to the modulator and R.F. stages of a transmitter by a circuit comprising a shunt capacitor 9 in series with a resistor 10 and a series inductor 8. The values R, L and C of the resistor 10, inductor 8 and capacitor 9 are chosen so that R = #C/C, and R is substantially equal to the input resistance of the modulator 7. This ensures that a constant impedance is presented to the output of the amplifier, while unwanted harmonics are dissipated in the resistor 10. Part of the modulated output of the transmitter is rectified at 11 to give an overall feed-back, which is combined at 13 with unwanted harmonics taken from a tap 12 on the resistor 10 and fed through an amplifier 15 to the input of the low-frequency amplifier.
GB29476/48A 1947-11-17 1948-11-12 Improvements relating to amplitude modulated radio transmitters Expired GB661957A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR661957X 1947-11-17

Publications (1)

Publication Number Publication Date
GB661957A true GB661957A (en) 1951-11-28

Family

ID=9011216

Family Applications (1)

Application Number Title Priority Date Filing Date
GB29476/48A Expired GB661957A (en) 1947-11-17 1948-11-12 Improvements relating to amplitude modulated radio transmitters

Country Status (1)

Country Link
GB (1) GB661957A (en)

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