GB629267A - Improvement in apparatus used for adjustment of radio apparatus - Google Patents

Improvement in apparatus used for adjustment of radio apparatus

Info

Publication number
GB629267A
GB629267A GB2385646A GB2385646A GB629267A GB 629267 A GB629267 A GB 629267A GB 2385646 A GB2385646 A GB 2385646A GB 2385646 A GB2385646 A GB 2385646A GB 629267 A GB629267 A GB 629267A
Authority
GB
United Kingdom
Prior art keywords
receiver
radio
attenuation
signal generator
predetermined level
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
GB2385646A
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.)
HARRY GEORGE THOMAS BISSMIRE
Murphy Radio Ltd
Original Assignee
HARRY GEORGE THOMAS BISSMIRE
Murphy Radio 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 HARRY GEORGE THOMAS BISSMIRE, Murphy Radio Ltd filed Critical HARRY GEORGE THOMAS BISSMIRE
Priority to GB2385646A priority Critical patent/GB629267A/en
Publication of GB629267A publication Critical patent/GB629267A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/3052—Automatic control in amplifiers having semiconductor devices in bandpass amplifiers (H.F. or I.F.) or in frequency-changers used in a (super)heterodyne receiver

Landscapes

  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
  • Circuits Of Receivers In General (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)

Abstract

629,267. Radio testing apparatus. MURPHY RADIO, Ltd., and BISSMIRE, H. G. T. Aug. 12, 1946, No. 23856. [Class 40 (v)] In radio testing apparatus, comprising an attenuator connected between a signal generator and an indicating instrument, a step-by-step switching device is provided for varying the attenuation in steps, the device being operated automatically when the current in the indicator circuit reaches a predetermined level. The arrangement facilitates adjustments which are necessary when trimming a receiver. In the Figure, the output from signal generator SG is applied through attenuator A to receiver R, the receiver output being measured in an indicating device OMI. A control circuit CC operates when the receiver output current reaches a predetermined level, to excite an electromagnetic rotary switch SM which varies the amount of attenuation in steps introduced in A. An indicator A1 may be provided to indicate the amount of attenuation involved at any given time.
GB2385646A 1946-08-12 1946-08-12 Improvement in apparatus used for adjustment of radio apparatus Expired GB629267A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2385646A GB629267A (en) 1946-08-12 1946-08-12 Improvement in apparatus used for adjustment of radio apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2385646A GB629267A (en) 1946-08-12 1946-08-12 Improvement in apparatus used for adjustment of radio apparatus

Publications (1)

Publication Number Publication Date
GB629267A true GB629267A (en) 1949-09-15

Family

ID=10202423

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2385646A Expired GB629267A (en) 1946-08-12 1946-08-12 Improvement in apparatus used for adjustment of radio apparatus

Country Status (1)

Country Link
GB (1) GB629267A (en)

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