GB462323A - Improvements in or relating to radio receivers - Google Patents

Improvements in or relating to radio receivers

Info

Publication number
GB462323A
GB462323A GB24914/35A GB2491435A GB462323A GB 462323 A GB462323 A GB 462323A GB 24914/35 A GB24914/35 A GB 24914/35A GB 2491435 A GB2491435 A GB 2491435A GB 462323 A GB462323 A GB 462323A
Authority
GB
United Kingdom
Prior art keywords
wavebands
valves
switch
resistance
bias
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
GB24914/35A
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
Publication of GB462323A publication Critical patent/GB462323A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • H04B1/163—Special arrangements for the reduction of the damping of resonant circuits of receivers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control
    • H03G3/22—Automatic control in amplifiers having discharge tubes

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Circuits Of Receivers In General (AREA)
  • Amplifiers (AREA)

Abstract

462,323. Wireless receiving systems. MARCONI'S WIRELESS TELEGRAPH CO., Ltd. Sept. 6, 1935, No. 24914. Convention date, Sept. 29, 1934. [Class 40 (v)] A multi-range receiver is provided with means interlocked with the wave-range switch for changing the sensitivity and/or the A.V.C. characteristics and/or the fidelity curve in different positions of said switch. A complete receiver having five wavelength ranges is described, Fig. 1 (not shown), the skeleton circuit of which is shown in the Figure, and comprises R.F. amplifier 10, detector-oscillator 11, first and second I.F. amplifiers 12, 13, detector-A.F. amplifier 14, and auxiliary I.F. amplifier 19 feeding A.Y.C. diode 18. The fiveposition wave-changing switches 130, 131 are ganged with switches 85, 68, 135 controlling the sensitivity, A.V.C. characteristic and fidelity curve of the receiver, respectively. Thus, on wavebands B, C, D the switch 85 connects a manually adjusted portion 37 of the self-bias cathode resistance of valves 10, 11 in parallel with a portion 104 of the self-bias resistance of valves 12, 13 while on wavebands X, A the resistance 37 controls the valves 10, 11 only. Two sources of A.V.C. potential are provided namely amplified delayed control bias from the load resistance 62, 63 of the A.V.C. diode 18, and bias from the load resistance 74 of the diode portion of valve 14. The switch 68 connects the grid circuits of valves 11, 12 to the first source on wavebands X, A and to the second source on wavebands B, C, D, while valve 13 is controlled always by the second source and the valve 10 by the first. The input circuits of valves 10, 11, however, are arranged so that the grids are earthed for D.C. potentials when switches 130, 131 are operated to receive waveband D. The fidelity control switch 135 is arranged to have no effect on wavebands X, A but to reduce the low-frequency response of the receiver on wavebands B, C, D by shortcircuiting a portion of a variable resistance in an audio-frequency tone-controlling network. Specification 440,483 is referred to.
GB24914/35A 1934-09-29 1935-09-06 Improvements in or relating to radio receivers Expired GB462323A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US462323XA 1934-09-29 1934-09-29

Publications (1)

Publication Number Publication Date
GB462323A true GB462323A (en) 1937-03-08

Family

ID=21942320

Family Applications (1)

Application Number Title Priority Date Filing Date
GB24914/35A Expired GB462323A (en) 1934-09-29 1935-09-06 Improvements in or relating to radio receivers

Country Status (1)

Country Link
GB (1) GB462323A (en)

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