GB522975A - Improvements in or relating to radio receivers employing automatic frequency control - Google Patents

Improvements in or relating to radio receivers employing automatic frequency control

Info

Publication number
GB522975A
GB522975A GB3723938A GB3723938A GB522975A GB 522975 A GB522975 A GB 522975A GB 3723938 A GB3723938 A GB 3723938A GB 3723938 A GB3723938 A GB 3723938A GB 522975 A GB522975 A GB 522975A
Authority
GB
United Kingdom
Prior art keywords
plate
circuit
access
frequency control
automatic frequency
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
GB3723938A
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 GB3723938A priority Critical patent/GB522975A/en
Publication of GB522975A publication Critical patent/GB522975A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • H03J5/26—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 operated by hand
    • H03J5/32—Stationary tuning circuits or elements selected by push-button
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J7/00—Automatic frequency control; Automatic scanning over a band of frequencies
    • H03J7/02—Automatic frequency control
    • H03J7/04—Automatic frequency control where the frequency control is accomplished by varying the electrical characteristics of a non-mechanically adjustable element or where the nature of the frequency controlling element is not significant

Landscapes

  • Structure Of Receivers (AREA)

Abstract

522,975. Wireless receivers. BARRACLOUGH, G. D. Dec. 22, 1938, No. 37239. [Class 40 (v)] In a radio receiver having an automatic frequency control circuit, access to one or more component parts of the chassis requiring adjustment e.g. the push button tuning circuit is obtained through a movable member e.g. an escutcheon plate, which normally prevents access to such parts and which, when thus moved, renders the A.F.C. circuit inoperative. Access to the adjustable elements associated with push buttons 1a, 1b. etc., is obtained through an aperture 3 normally closed by a removable escutcheon plate 4. The latter is held in position on the cabinet by screws 5, which thread in holes 7, 8 in metal brackets 9, 10. When the plate is in position the screw 5 bears against a leaf spring 12 making contact with the chassis so as to maintain the spring out of contact with a terminal 13 connected to the A.F.C. circuit. On removal of the screw 5 the spring 12 makes contact with the terminal 13 and the A.F.C. system is earthed. In a modification the plate is hinged to the cabinet and the A.F.C. system is put out of action by rotating the plate on its hinge.
GB3723938A 1938-12-22 1938-12-22 Improvements in or relating to radio receivers employing automatic frequency control Expired GB522975A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3723938A GB522975A (en) 1938-12-22 1938-12-22 Improvements in or relating to radio receivers employing automatic frequency control

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3723938A GB522975A (en) 1938-12-22 1938-12-22 Improvements in or relating to radio receivers employing automatic frequency control

Publications (1)

Publication Number Publication Date
GB522975A true GB522975A (en) 1940-07-02

Family

ID=10394874

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3723938A Expired GB522975A (en) 1938-12-22 1938-12-22 Improvements in or relating to radio receivers employing automatic frequency control

Country Status (1)

Country Link
GB (1) GB522975A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2000402A (en) * 1977-06-20 1979-01-04 Pioneer Electronic Corp Multiband radio receiver with electronic preset tuning system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2000402A (en) * 1977-06-20 1979-01-04 Pioneer Electronic Corp Multiband radio receiver with electronic preset tuning system
GB2000402B (en) * 1977-06-20 1982-02-03 Pioneer Electronic Corp Multiband radio receiver with electronic preset tuning system

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