GB455649A - Improvements in or relating to radio receivers - Google Patents

Improvements in or relating to radio receivers

Info

Publication number
GB455649A
GB455649A GB12558/35A GB1255835A GB455649A GB 455649 A GB455649 A GB 455649A GB 12558/35 A GB12558/35 A GB 12558/35A GB 1255835 A GB1255835 A GB 1255835A GB 455649 A GB455649 A GB 455649A
Authority
GB
United Kingdom
Prior art keywords
broadcast receiver
television
tuning
response
receiver
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
GB12558/35A
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.)
Marconis Wireless Telegraph Co Ltd
BAE Systems Electronics Ltd
Original Assignee
Marconis Wireless Telegraph Co Ltd
Marconi 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, Marconi Co Ltd filed Critical Marconis Wireless Telegraph Co Ltd
Priority to GB12558/35A priority Critical patent/GB455649A/en
Priority to FR804837D priority patent/FR804837A/en
Priority to US73989A priority patent/US2141756A/en
Publication of GB455649A publication Critical patent/GB455649A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/01—Frequency selective two-port networks
    • H03H7/0153—Electrical filters; Controlling thereof
    • H03H7/0161—Bandpass filters
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J5/00—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner
    • H03J5/24—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with a number of separate pretuned tuning circuits or separate tuning elements selectively brought into circuit, e.g. for waveband selection or for television channel selection
    • H03J5/242—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with a number of separate pretuned tuning circuits or separate tuning elements selectively brought into circuit, e.g. for waveband selection or for television channel selection used exclusively for band selection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/16—Circuits
    • H04B1/26—Circuits for superheterodyne receivers

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Circuits Of Receivers In General (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)

Abstract

455,649. Wireless receivers. MARCONI'S WIRELESS TELEGRAPH CO., Ltd., Electra House, Victoria Embankment, and LINSELL, A. A., 80, Crystal Palace Park Road, Sydenham, both in London. April 26, 1935, No. 12558. [Class 40 (v)] A receiver operating over a short wave television range and as a sound broadcast receiver is provided with means on switching to television to broaden the frequency response of the sound broadcast receiving apparatus which is employed as an intermediate frequency amplifier so as to pass the relatively wide band of frequencies occupied by television signals and to fix the tuning of the broadcast receiver. The Figure shows a supersonic heterodyne broadcast receiver preceded by a short wave frequency changer 3 so that the signal frequency circuits of the broadcast receiver serve as the intermediate frequency amplifier on short waves. The broadcast receiver is tuned to the required frequency and its frequency response increased to pass the sideband frequencies required in television by switches 10, 10<1> which replace the variable tuning condensers by fixed condensers and insert damping resistances 12, 12<1> while the response in the intermediate frequency amplifier is increased by damping resistance 16. Instead of shunt resistances series resistances or combinations of resistance, inductance and capacity may be used to broaden the response band of the receiver, alternatively the grid bias may be adjusted to vary the valve damping. In a modification, Figs. 2 and 3 (not shown), the switch operation is conjoint with the tuning control being operated when this control is adjusted to a predetermined, e.g. minimum wavelength position. The fixed tuning capacities may be formed by the self capacity of the coils.
GB12558/35A 1935-04-26 1935-04-26 Improvements in or relating to radio receivers Expired GB455649A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB12558/35A GB455649A (en) 1935-04-26 1935-04-26 Improvements in or relating to radio receivers
FR804837D FR804837A (en) 1935-04-26 1936-04-09 Improvements to radio receivers
US73989A US2141756A (en) 1935-04-26 1936-04-13 Multirange receiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB12558/35A GB455649A (en) 1935-04-26 1935-04-26 Improvements in or relating to radio receivers

Publications (1)

Publication Number Publication Date
GB455649A true GB455649A (en) 1936-10-26

Family

ID=10006854

Family Applications (1)

Application Number Title Priority Date Filing Date
GB12558/35A Expired GB455649A (en) 1935-04-26 1935-04-26 Improvements in or relating to radio receivers

Country Status (3)

Country Link
US (1) US2141756A (en)
FR (1) FR804837A (en)
GB (1) GB455649A (en)

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE940837C (en) * 1938-08-04 1956-03-29 Lorenz C Ag Television receiver
US2505754A (en) * 1945-08-02 1950-05-02 Edward E Combs Superheterodyne circuit
US2597142A (en) * 1945-12-20 1952-05-20 Cossor Ltd A C Radio receiver circuits
US2598857A (en) * 1949-01-29 1952-06-03 Rca Corp Television signal converter
US2715681A (en) * 1949-09-21 1955-08-16 Du Mont Allen B Lab Inc Tuner for ultra high frequencies
NL88018C (en) * 1951-10-13
US2763776A (en) * 1951-10-18 1956-09-18 Avco Mfg Corp Ultrahigh-frequency converter for very-high-frequency television receiver
US2665377A (en) * 1951-12-20 1954-01-05 Sarkes Tarzian Universal tuning system for television receivers
BE517017A (en) * 1952-01-21
US2849602A (en) * 1952-03-01 1958-08-26 Du Mont Allen B Lab Inc Heterodyne circuit
BE518135A (en) * 1952-03-03
US2787703A (en) * 1952-03-03 1957-04-02 Philips Corp Receiver for two radio frequency bands
DE955605C (en) * 1952-07-12 1957-01-03 Blaupunkt Werke G M B H Zweign Combined television and radio set
US2989627A (en) * 1952-08-09 1961-06-20 Itt Television receiver with ultra high frequency cavity tuner inside very high frequency turret tuner
US2773988A (en) * 1952-11-26 1956-12-11 Standard Coil Prod Co Inc Frequency selector
US2902598A (en) * 1953-03-31 1959-09-01 Radion Corp Double conversion multi-band tuning unit
US2927203A (en) * 1955-09-05 1960-03-01 Burke John Donald Control member for simultaneous actuation of multi-band tuner and control element
US2873360A (en) * 1955-11-29 1959-02-10 Aladdin Ind Inc Very high frequency tuner convertible to intermediate frequency amplifier

Also Published As

Publication number Publication date
FR804837A (en) 1936-11-03
US2141756A (en) 1938-12-27

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