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GB625929A - Improvements in or relating to radio receivers provided with an alarm device - Google Patents

Improvements in or relating to radio receivers provided with an alarm device

Info

Publication number
GB625929A
GB625929A GB3667646A GB3667646A GB625929A GB 625929 A GB625929 A GB 625929A GB 3667646 A GB3667646 A GB 3667646A GB 3667646 A GB3667646 A GB 3667646A GB 625929 A GB625929 A GB 625929A
Authority
GB
United Kingdom
Prior art keywords
switch
frequency
relating
alarm device
radio receivers
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
GB3667646A
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.)
NORMAN MALCOLM WOODHALL
EK Cole Ltd
Original Assignee
NORMAN MALCOLM WOODHALL
EK Cole 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 NORMAN MALCOLM WOODHALL, EK Cole Ltd filed Critical NORMAN MALCOLM WOODHALL
Priority to GB3667646A priority Critical patent/GB625929A/en
Publication of GB625929A publication Critical patent/GB625929A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G04—HOROLOGY
    • G04C—ELECTROMECHANICAL CLOCKS OR WATCHES
    • G04C23/00—Clocks with attached or built-in means operating any device at preselected times or after preselected time-intervals

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Superheterodyne Receivers (AREA)
  • Circuits Of Receivers In General (AREA)
  • Burglar Alarm Systems (AREA)

Abstract

625,929. Superheterodyne circuits. COLE, Ltd., E. K., and WOODHALL, N. M. Dec. 12, 1946, No. 36676. [Classes 40 (v) and 40 (vi)] In a radio receiver having a clock-controlled switch, an intermediate frequency valve may be caused to oscillate at audio-frequency to produce an alarm signal in the loud-speaker. An intermediate frequency amplifier valve V1 having input and output tuned circuits 1 and 2 includes a switch 3 which when operated connects an inductor 4 of a tuned circuit comprising also condensers 5 and 8 into the screen grid circuit to cause audio-frequency oscillation. Condenser 7 feeds these oscillations to the grid of an output amplifier. It is suggested in the Provisional Specification that the switch 3 may be omitted, the oscillation stopped by the A.G.C. voltage when a signal is received.
GB3667646A 1946-12-12 1946-12-12 Improvements in or relating to radio receivers provided with an alarm device Expired GB625929A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3667646A GB625929A (en) 1946-12-12 1946-12-12 Improvements in or relating to radio receivers provided with an alarm device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3667646A GB625929A (en) 1946-12-12 1946-12-12 Improvements in or relating to radio receivers provided with an alarm device

Publications (1)

Publication Number Publication Date
GB625929A true GB625929A (en) 1949-07-06

Family

ID=10390275

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3667646A Expired GB625929A (en) 1946-12-12 1946-12-12 Improvements in or relating to radio receivers provided with an alarm device

Country Status (1)

Country Link
GB (1) GB625929A (en)

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