GB484404A - Improvements in or relating to radio receivers - Google Patents

Improvements in or relating to radio receivers

Info

Publication number
GB484404A
GB484404A GB29756/36A GB2975636A GB484404A GB 484404 A GB484404 A GB 484404A GB 29756/36 A GB29756/36 A GB 29756/36A GB 2975636 A GB2975636 A GB 2975636A GB 484404 A GB484404 A GB 484404A
Authority
GB
United Kingdom
Prior art keywords
intermediate frequency
amplifier
rectifier
circuit
frequency spectrum
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
GB29756/36A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB29756/36A priority Critical patent/GB484404A/en
Priority to US171678A priority patent/US2210497A/en
Priority to FR828418D priority patent/FR828418A/en
Publication of GB484404A publication Critical patent/GB484404A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/60—Receiver circuitry for the reception of television signals according to analogue transmission standards for the sound signals

Abstract

484,404. Valve circuits for wireless reception. PERCIVAL, W. S. Nov. 2, 1936, No. 29756. [Class 40 (v)] In a superheterodyne receiver for television and sound employing a single oscillator and a common amplifier for the two intermediate frequency channels, the low-pass amplifier is provided with a band-pass output for the vision signals which are fed directly to a rectifier which constitutes the whole or a substantial part of the matching termination for the bandpass output. The intermediate frequency amplifier V3 ... V6 couplings are designed in conjunction with the valve capacities as described in Specification 475,490. A cut-off at the lower end of the intermediate frequency spectrum is effected by the condenser 16 and leak resistance 17 and by the use of small condensers 19 to give de-generation of the frequencies below the intermediate frequency spectrum. The output from the valve V6 is applied through the series tuned circuit 29, 30 to a shunt circuit formed by inductance 31 and the input capacity of the rectifier. The load impedance 32 is low and with the rectifier forms the terminating impedance of the coupling network. Sound signals are suppressed by degeneration produced by the circuit 22, 23 and this circuit may be utilized to feed these signals to a separate amplifier. If the cut-off at the lower end of the intermediate frequency spectrum reduces the amplification of a portion of the signal frequencies means may be provided to compensate this loss. Specifications 449,205 and 453,484 also are referred to.
GB29756/36A 1936-11-02 1936-11-02 Improvements in or relating to radio receivers Expired GB484404A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB29756/36A GB484404A (en) 1936-11-02 1936-11-02 Improvements in or relating to radio receivers
US171678A US2210497A (en) 1936-11-02 1937-10-29 Amplifying system
FR828418D FR828418A (en) 1936-11-02 1937-10-29 Improvements to radio receivers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB29756/36A GB484404A (en) 1936-11-02 1936-11-02 Improvements in or relating to radio receivers

Publications (1)

Publication Number Publication Date
GB484404A true GB484404A (en) 1938-05-02

Family

ID=10296667

Family Applications (1)

Application Number Title Priority Date Filing Date
GB29756/36A Expired GB484404A (en) 1936-11-02 1936-11-02 Improvements in or relating to radio receivers

Country Status (3)

Country Link
US (1) US2210497A (en)
FR (1) FR828418A (en)
GB (1) GB484404A (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2629822A (en) * 1947-01-31 1953-02-24 Motorola Inc High-frequency coupling circuits
US2549761A (en) * 1947-04-30 1951-04-24 Int Standard Electric Corp Low noise intermediate-frequency amplifier
US2652447A (en) * 1949-01-19 1953-09-15 Bendix Aviat Corp Sound separation means for carrier frequency difference television receivers
US2706218A (en) * 1949-11-15 1955-04-12 William A Wootten System for television-program film recording and record reproduction
DE976524C (en) * 1953-01-30 1963-10-24 Telefunken Patent Video amplifier stage for a television receiver with sound reception according to the differential carrier method
US2774825A (en) * 1953-02-17 1956-12-18 Gen Precision Lab Inc Logarithmic amplifier

Also Published As

Publication number Publication date
FR828418A (en) 1938-05-18
US2210497A (en) 1940-08-06

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