GB562325A - Improvements in or relating to thermionic valve circuits - Google Patents

Improvements in or relating to thermionic valve circuits

Info

Publication number
GB562325A
GB562325A GB1636/43A GB163643A GB562325A GB 562325 A GB562325 A GB 562325A GB 1636/43 A GB1636/43 A GB 1636/43A GB 163643 A GB163643 A GB 163643A GB 562325 A GB562325 A GB 562325A
Authority
GB
United Kingdom
Prior art keywords
valve
impedance
input
frequency
cathode
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
GB1636/43A
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.)
CHARLES MALTON LE GRICE EYRE
STC PLC
Original Assignee
CHARLES MALTON LE GRICE EYRE
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 CHARLES MALTON LE GRICE EYRE, Standard Telephone and Cables PLC filed Critical CHARLES MALTON LE GRICE EYRE
Publication of GB562325A publication Critical patent/GB562325A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D7/00—Transference of modulation from one carrier to another, e.g. frequency-changing
    • H03D7/06—Transference of modulation from one carrier to another, e.g. frequency-changing by means of discharge tubes having more than two electrodes
    • H03D7/08—Transference of modulation from one carrier to another, e.g. frequency-changing by means of discharge tubes having more than two electrodes the signals to be mixed being applied between the same two electrodes
    • 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
    • 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

Abstract

562,325. Valve modulating or demodulating circuits. STANDARD TELEPHONES & CABLES, Ltd., EYRE, C. M. LE G., and GILDERDALE, J. O. Feb. 1, 1943, No. 1636. [Class 40 (v)] An impedance is provided in the cathode lead of a frequency changing, demodulating or modulating valve to provide negative feedback. The signal and the carrier wave are simultaneously applied to the input and the valve is fed with such amplitudes and is so biased as to operate over a curved portion of its characteristic. The modulation product output is taken from across the cathode impedance, a blocking condenser being provided if necessary, and fed to a coaxial transmission line, the impedance of which is substantially matched. The Figure shows a frequency-changing valve V with a band filter L2, C2, L3, C3 for a radio frequency input and the local oscillator input applied to coupling coil L1. The intermediate frequency output is taken from across the cathode resistance R1 and is applied to coaxial transmission line T, condenser C1 shunting the RF input. Resistance R1 is so chosen that the line is matched to the effective output impedance of the valve. The valve is preferably of the type having a screen grid and de-coupling of the anode and screen circuits is effected by resistances R4, R6 and condensers K1.
GB1636/43A 1943-02-01 1943-02-01 Improvements in or relating to thermionic valve circuits Expired GB562325A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB254686X 1943-02-01

Publications (1)

Publication Number Publication Date
GB562325A true GB562325A (en) 1944-06-27

Family

ID=10228183

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1636/43A Expired GB562325A (en) 1943-02-01 1943-02-01 Improvements in or relating to thermionic valve circuits

Country Status (5)

Country Link
US (1) US2408053A (en)
BE (1) BE475935A (en)
CH (1) CH254686A (en)
FR (1) FR939170A (en)
GB (1) GB562325A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2616033A (en) * 1948-12-24 1952-10-28 Zenith Radio Corp Converter
US2843826A (en) * 1953-05-21 1958-07-15 Philco Corp Modulator system

Also Published As

Publication number Publication date
FR939170A (en) 1948-11-05
US2408053A (en) 1946-09-24
BE475935A (en)
CH254686A (en) 1948-05-15

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