GB542277A - Improvements in or relating to radio transmitters - Google Patents

Improvements in or relating to radio transmitters

Info

Publication number
GB542277A
GB542277A GB237440A GB237440A GB542277A GB 542277 A GB542277 A GB 542277A GB 237440 A GB237440 A GB 237440A GB 237440 A GB237440 A GB 237440A GB 542277 A GB542277 A GB 542277A
Authority
GB
United Kingdom
Prior art keywords
voltage
grid
bias
power amplifier
oscillator
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
GB237440A
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 GB237440A priority Critical patent/GB542277A/en
Publication of GB542277A publication Critical patent/GB542277A/en
Priority to FR949660D priority patent/FR949660A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C1/00—Amplitude modulation
    • H03C1/16—Amplitude modulation by means of discharge device having at least three electrodes
    • H03C1/18—Amplitude modulation by means of discharge device having at least three electrodes carrier applied to control grid
    • H03C1/22—Amplitude modulation by means of discharge device having at least three electrodes carrier applied to control grid modulating signal applied to same grid

Landscapes

  • Transmitters (AREA)

Abstract

542,277. Valve circuits. DALGLEISH, J. W., POOLE, S. R., and PYE, Ltd. Feb. 7, 1940, No. 2374. [Class 40 (v)] In a transmitter comprising a master oscillator and grid-modulated power amplifier, the grid bias voltage for the power amplifier is derived by rectification of the H.F. voltage generated by the oscillator, whereby the H.F. drive voltage and the bias voltage applied to the power amplifier bear a fixed relationship to each other. High frequency voltage from the anode 4 of the master oscillator is fed to the grid 3 of the power amplifier. High frequency current is fed through condenser 5 and resistance 10 to a diode anode 6 which co-operates with the cathode of the oscillator. The rectified voltage developed across resistance 7 is fed via filter 8, 9 as a bias to grid 3, the microphone M being coupled in this lead by transformer 11. A variable condenser 12 enables the relationship of the H.F. voltage and grid bias to be adjusted. A suitable grid bias battery is connected between resistor 7 and earth which acts as a delay voltage for the diode 6 and ensures that the power amplifier will not be operated without bias in the event of failure of the H.F. voltage.
GB237440A 1940-02-07 1940-02-07 Improvements in or relating to radio transmitters Expired GB542277A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB237440A GB542277A (en) 1940-02-07 1940-02-07 Improvements in or relating to radio transmitters
FR949660D FR949660A (en) 1940-02-07 1946-09-12 Electrode bias device for high frequency switchgear

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB237440A GB542277A (en) 1940-02-07 1940-02-07 Improvements in or relating to radio transmitters

Publications (1)

Publication Number Publication Date
GB542277A true GB542277A (en) 1942-01-02

Family

ID=9738418

Family Applications (1)

Application Number Title Priority Date Filing Date
GB237440A Expired GB542277A (en) 1940-02-07 1940-02-07 Improvements in or relating to radio transmitters

Country Status (2)

Country Link
FR (1) FR949660A (en)
GB (1) GB542277A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2955197A (en) * 1956-10-09 1960-10-04 James W Bryan Selected frequency transistor transmitter

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2955197A (en) * 1956-10-09 1960-10-04 James W Bryan Selected frequency transistor transmitter

Also Published As

Publication number Publication date
FR949660A (en) 1949-09-06

Similar Documents

Publication Publication Date Title
GB558884A (en) High-voltage direct current supply system
GB568556A (en) Improvements in or relating to frequency dividing circuits
GB591965A (en) Improvements relating to super-regenerative radio receivers
GB542277A (en) Improvements in or relating to radio transmitters
GB540941A (en) Improvements in or relating to electric oscillation generating circuits
GB516047A (en) Improvements in or relating to circuit arrangements for maintaining a constant terminal voltage across a load
GB542408A (en) Improvements in or relating to electrode biassing arrangements in high frequency apparatus
GB388292A (en) Improvements in or relating to thermionic amplifying arrangements
GB516357A (en) Improvements in generators of electrical oscillations of saw-toothed wave form
GB271465A (en) Improved circuit arrangement for modulating the oscillations generated by a thermionic device
GB564236A (en) Improvements in frequency-discriminating electric circuits
GB542030A (en) Automatic volume control system
GB490622A (en) Improvements in means for producing electrical oscillations of square wave form
GB519743A (en) Improvements relating to amplifying systems
GB556757A (en) Improvements in or relating to generators of electric oscillations
GB616447A (en) Improvements in and relating to thermionic valve amplifiers
GB509604A (en) Improvements in or relating to electric rectifying circuits
GB516745A (en) Improvements in thermionic amplifiers
GB546168A (en) Improvements in frequency stabilising circuits for frequency modulation systems
GB166594A (en) Improvements in wireless telegraphy, wireless telephony and the like
GB468756A (en) Improvements in or relating to modulated carrier-wave transmitters
GB453501A (en) Improvements in or relating to modulated carrier wave transmitters
GB663969A (en) Improvements in or relating to high voltage direct current power supplies
GB400995A (en) Improvements in or relating to electrical oscillation generators
GB461966A (en) Improvements in and relating to electric wave amplifying systems