GB538206A - Systems for the transmission of modulated radio electric waves - Google Patents

Systems for the transmission of modulated radio electric waves

Info

Publication number
GB538206A
GB538206A GB2537/40A GB253740A GB538206A GB 538206 A GB538206 A GB 538206A GB 2537/40 A GB2537/40 A GB 2537/40A GB 253740 A GB253740 A GB 253740A GB 538206 A GB538206 A GB 538206A
Authority
GB
United Kingdom
Prior art keywords
circuit
impedance
inductance
quarter wave
modulating
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
GB2537/40A
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Publication of GB538206A publication Critical patent/GB538206A/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
    • H03F1/08—Modifications of amplifiers to reduce detrimental influences of internal impedances of amplifying elements
    • H03F1/14—Modifications of amplifiers to reduce detrimental influences of internal impedances of amplifying elements by use of neutralising means
    • H03F1/16—Modifications of amplifiers to reduce detrimental influences of internal impedances of amplifying elements by use of neutralising means in discharge-tube amplifiers
    • 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
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/50—Amplifiers in which input is applied to, or output is derived from, an impedance common to input and output circuits of the amplifying element, e.g. cathode follower
    • H03F3/52—Amplifiers in which input is applied to, or output is derived from, an impedance common to input and output circuits of the amplifying element, e.g. cathode follower with tubes only
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/54—Amplifiers using transit-time effect in tubes or semiconductor devices

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microwave Amplifiers (AREA)
  • Amplifiers (AREA)

Abstract

538,206. Valve modulating circuits. STANDARD TELEPHONES and CABLES, Ltd. Feb. 9, 1940, No. 2537. Convention date, Feb. 14, 1939. [Class 40 (v)] An arrangement for modulating an ultra short wave by a wide frequency band comprises a balanced amplifier with the carrier input applied between the cathodes and the modulating frequencies to the grids in parallel. The valve inter-electrode capacities are neutralized to obtain a low effective capacity in the plate circuit. Fig. 1 shows a push-pull amplifier driven from the cathode circuit in which a grid impedance Z4 neutralizes the valve inter-electrode capacities. Fig. 4 shows a transmitter in which the grid impedance consists of a quarter wave line 13 terminated in a variable inductance 12 and arranged to reduce the capacitance to ground of the circuit. The drive is effected over a quarter wave line 2, 21 and the impedance of the input circuit is adjusted by varying the surge impedance of the line by the condenser 6 and by the coupling resistances 3, 3<SP>1</SP>. The heating current for the driven stage is fed through conductors arranged within the transmission lines which may be extended through another quarter wave line 5, 5<SP>1</SP> which form a choke for high frequency. Modulation is applied between the grids and earth across resistance 11 and to the midpoint of inductance 12, Fig. 4, or to the midpoint of inductance Z4, Fig. 1.
GB2537/40A 1939-02-14 1940-02-09 Systems for the transmission of modulated radio electric waves Expired GB538206A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR856061T 1939-02-14

Publications (1)

Publication Number Publication Date
GB538206A true GB538206A (en) 1941-07-24

Family

ID=37668267

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2537/40A Expired GB538206A (en) 1939-02-14 1940-02-09 Systems for the transmission of modulated radio electric waves

Country Status (5)

Country Link
US (1) US2431333A (en)
BE (1) BE472799A (en)
CH (1) CH261238A (en)
FR (1) FR856061A (en)
GB (1) GB538206A (en)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR959970A (en) * 1946-10-18 1950-04-07
GB655747A (en) * 1948-11-04 1951-08-01 Emi Ltd Improvements relating to circuit arrangements for amplifying amplitude modulated oscillations
US2662124A (en) * 1949-06-01 1953-12-08 Bell Telephone Labor Inc Transistor amplifier circuit
US2659774A (en) * 1949-06-07 1953-11-17 Bell Telephone Labor Inc Bidirectional transistor amplifier
US2659773A (en) * 1949-06-07 1953-11-17 Bell Telephone Labor Inc Inverted grounded emitter transistor amplifier
US2681953A (en) * 1951-01-23 1954-06-22 Int Standard Electric Corp Neutralizing circuit for groundedgrid amplifiers
US2691078A (en) * 1951-05-17 1954-10-05 Rca Corp Neutralizing circuits for highfrequency amplifiers
US2763776A (en) * 1951-10-18 1956-09-18 Avco Mfg Corp Ultrahigh-frequency converter for very-high-frequency television receiver
US2913539A (en) * 1953-10-02 1959-11-17 Rca Corp Wide band signal amplifier circuit
US2799736A (en) * 1953-11-03 1957-07-16 Standard Coil Prod Co Inc Radio frequency amplifier
US2795655A (en) * 1954-10-07 1957-06-11 Standard Coil Prod Co Inc Regenerative compensation of radio frequency amplifiers
US2890291A (en) * 1955-01-27 1959-06-09 Hoffman Electronics Corp Linear high-gain amplifier circuits or the like

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2226074A (en) * 1938-08-05 1940-12-24 Gen Electric Amplifier
US2247442A (en) * 1939-07-29 1941-07-01 Western Electric Co Neutralizing arrangement for amplifiers
US2299481A (en) * 1940-03-26 1942-10-20 Western Electric Co Neutralizing system

Also Published As

Publication number Publication date
BE472799A (en) 1947-10-29
CH261238A (en) 1949-04-30
US2431333A (en) 1947-11-25
FR856061A (en) 1940-05-27

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