GB398853A - Improvements in or relating to radio and other high frequency modulated carrier wave systems - Google Patents

Improvements in or relating to radio and other high frequency modulated carrier wave systems

Info

Publication number
GB398853A
GB398853A GB8526/32A GB852632A GB398853A GB 398853 A GB398853 A GB 398853A GB 8526/32 A GB8526/32 A GB 8526/32A GB 852632 A GB852632 A GB 852632A GB 398853 A GB398853 A GB 398853A
Authority
GB
United Kingdom
Prior art keywords
amplifier
output
modulation
level
aerial
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
GB8526/32A
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
Priority to GB8526/32A priority Critical patent/GB398853A/en
Priority to US656869A priority patent/US2085011A/en
Publication of GB398853A publication Critical patent/GB398853A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
    • H03F1/04—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in discharge-tube amplifiers
    • H03F1/06—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in discharge-tube amplifiers to raise the efficiency of amplifying modulated radio frequency waves; to raise the efficiency of amplifiers acting also as modulators
    • H03F1/07—Doherty-type amplifiers

Abstract

398,853. Valve modulating circuits. MARCONI'S WIRELESS TELEGRAPH CO., Ltd., Marconi House, Strand, London, and DITCHAM, W. T., Tudor House, Broomfield Road, Chelmsford, Essex. March 22, 1932, No. 8526. [Class 40 (v).] To increase the efficiency of a modulating system suitable for broadcasting, signal voltages above carrier-level are handled by one amplifierchannel, whilst those below carrier-level are passed through a second and independent amplifier-channel in parallel with the first. As shown in Fig. 1, a master-oscillator 1 feeds a low-power H.F. amplifier 2 which is modulated from a source 2a. The output is coupled to two high-powered amplifier-channels 3, 4 connected in parallel to the aerial 7, but separated by a decoupling device 6. The amplifier 3 is so biased that at normal carrierlevel it is " quiescent," i.e. its output is substantially nil. The amplifier 4 is fitted with a voltage-limiter 5 so that its effective output is prevented from rising above carrier-level irrespective of fluctuations in the input from the modulator 2. During a positive half-cycle of modulation, the amplifier 3 increases its output to the aerial, whilst on the negative half-cycle the transfer of energy through the amplifier 4 drops by a corresponding amount. In an alternative arrangement, series modulation is effected in each of the amplifiers 3, 4 by separate valves, one arranged to be effective on positive and the other on negative halfcycles of modulation. Specification 262,076, [Class 40 (v), Wireless signalling &c.], is referred
GB8526/32A 1932-03-22 1932-03-22 Improvements in or relating to radio and other high frequency modulated carrier wave systems Expired GB398853A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB8526/32A GB398853A (en) 1932-03-22 1932-03-22 Improvements in or relating to radio and other high frequency modulated carrier wave systems
US656869A US2085011A (en) 1932-03-22 1933-02-15 Modulated carrier wave signaling system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8526/32A GB398853A (en) 1932-03-22 1932-03-22 Improvements in or relating to radio and other high frequency modulated carrier wave systems

Publications (1)

Publication Number Publication Date
GB398853A true GB398853A (en) 1933-09-22

Family

ID=9854119

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8526/32A Expired GB398853A (en) 1932-03-22 1932-03-22 Improvements in or relating to radio and other high frequency modulated carrier wave systems

Country Status (2)

Country Link
US (1) US2085011A (en)
GB (1) GB398853A (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR845728A (en) * 1938-04-30 1939-08-31 Le Transformateur Device for modulating a high frequency oscillation or for amplifying a modulated high frequency oscillation
NL136059B (en) * 1942-03-13
US2446025A (en) * 1946-05-10 1948-07-27 Avco Mfg Corp Modulation system
EP1959565A1 (en) * 2004-06-18 2008-08-20 Mitsubishi Electric Corporation High efficiency amplifier

Also Published As

Publication number Publication date
US2085011A (en) 1937-06-29

Similar Documents

Publication Publication Date Title
US2282714A (en) Method and means for the linear transmission or amplification of amplitude-modulatedcarrier waves
GB1246140A (en) Improvements in or relating to high efficiency transmitters
GB398853A (en) Improvements in or relating to radio and other high frequency modulated carrier wave systems
GB256828A (en) Improvements in or relating to wireless telegraphy and telephony
US2243719A (en) Signaling system
GB523353A (en) Improvements in or relating to modulation systems
GB689769A (en) Modulator for pulse signalling systems
GB535834A (en) Improvements in or relating to wide frequency band amplifier systems
GB700890A (en) Electric signal translating circuits
GB814632A (en) Improvements in or relating to amplitude modulated carrier wave transmitters
US2114336A (en) Modulated wave transmitter
US2120800A (en) Transmitter
GB411643A (en) Improvements in or relating to radio and similar modulated high frequency carrier wave transmitters
GB413647A (en) Improvements in or relating to carrier wave transmission systems
GB172350A (en) Improvements in modulation systems for wireless signalling and the like
GB288636A (en) Improvements in electrical signal transmission systems
GB427026A (en) Improvements in or relating to modulating carrier wave transmitters
GB483883A (en) Improvements in or relating to radio transmitting systems
GB451237A (en) Improvements in or relating to carrier wave transmitting apparatus
GB453732A (en) Improvements in carrier wave modulating systems
GB369112A (en) Improvements in or relating to modulating systems for electric oscillations
GB456526A (en) Improvements in or relating to modulated carrier wave transmitters
GB388756A (en) Improvements in or relating to modulation systems suitable for use in wireless signalling and like transmission systems
GB485470A (en) Improvements in or relating to modulated carrier wave transmitters
GB443803A (en) Improvements in or relating to ultra short wave modulating systems