GB518552A - Improvements in radio tuning circuits - Google Patents

Improvements in radio tuning circuits

Info

Publication number
GB518552A
GB518552A GB2517238A GB2517238A GB518552A GB 518552 A GB518552 A GB 518552A GB 2517238 A GB2517238 A GB 2517238A GB 2517238 A GB2517238 A GB 2517238A GB 518552 A GB518552 A GB 518552A
Authority
GB
United Kingdom
Prior art keywords
auxiliary
controlled
condensers
reactances
separate
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
GB2517238A
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
Priority to BE436153D priority Critical patent/BE436153A/xx
Application filed by Marconis Wireless Telegraph Co Ltd, Marconi Co Ltd filed Critical Marconis Wireless Telegraph Co Ltd
Priority to GB2517238A priority patent/GB518552A/en
Publication of GB518552A publication Critical patent/GB518552A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J3/00—Continuous tuning
    • H03J3/28—Continuous tuning of more than one resonant circuit simultaneously, the tuning frequencies of the circuits having a substantially constant difference throughout the tuning range

Landscapes

  • Oscillators With Electromechanical Resonators (AREA)
  • Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)

Abstract

518,552. Radio receiving apparatus. MARCONI'S WIRELESS TELEGRAPH CO., Ltd., and BRAILSFORD. J. D. Aug. 26, 1938, No. 25172. [Class 40 (v)] [Also in Group XXXVI] Gang-controlled reactances having switch means to change the wavebands, have auxiliary reactances associated with a plurality of tuning bands controlled by the ganging means and 'capable of adjustment by deformation of moving or controlling parts to correct for tracking errors. The correcting means may be additional to the usual padding condenser. The auxiliary impedance may be capacitative, as shown in Fig. 5, in which auxiliary condensers 1, 2 are mounted on the main shaft, or inductive as shown in Fig. 7 in which a coil has a moving core P mounted on a spring IS and controlled through a tappet ST by a laterally-deformable cam TC. Separate condensers 1, 2 or coils l and cams TC are provided for separate wave bands and in the former case the appropriate condenser is connected up by additional contacts on the wave-band switch. The apparatus is particularly applicable to superheterodyne receivers with the auxiliary reactance connected in the local-oscillator circuit.
GB2517238A 1938-08-26 1938-08-26 Improvements in radio tuning circuits Expired GB518552A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
BE436153D BE436153A (en) 1938-08-26
GB2517238A GB518552A (en) 1938-08-26 1938-08-26 Improvements in radio tuning circuits

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2517238A GB518552A (en) 1938-08-26 1938-08-26 Improvements in radio tuning circuits

Publications (1)

Publication Number Publication Date
GB518552A true GB518552A (en) 1940-02-29

Family

ID=10223394

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2517238A Expired GB518552A (en) 1938-08-26 1938-08-26 Improvements in radio tuning circuits

Country Status (2)

Country Link
BE (1) BE436153A (en)
GB (1) GB518552A (en)

Also Published As

Publication number Publication date
BE436153A (en)

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