Monitor, amplitude modulation

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Ingenium, 1986.0541.001
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OBJECT TYPE: N/A
DATE: 1945–1957
ARTIFACT NUMBER: 1986.0541.001

MANUFACTURER: General Radio Co.
MODEL: 1931-A
LOCATION: Cambridge, Massachusetts, United States of America

More Information

General Information

Serial #: 131
Part Number: 1
Total Parts: 1
AKA: N/A
Patents: N/A
General Description: METAL CABINET/ SYNTHETIC KNOBS/ GLASS DIAL COVERS/GLASS, METAL & SYNTHETIC WORKING PARTS.

Dimensions

Note: These reflect the general size for storage and are not necessarily representative of the object's true dimensions.

Length: 48.2 cm
Width: 34.0 cm
Height: 22.0 cm
Thickness: N/A
Weight: N/A
Diameter: N/A
Volume: N/A

Lexicon

Group: Communications
Category: Radio
Sub-Category: N/A

Manufacturer

AKA: General Radio
Country: United States of America
State/Province: Massachusetts
City: Cambridge

Context

Country: Canada
State/Province: Unknown
Period: 1940s & 1950s
Canada: USED IN CANADA
Function: TO MEASURE & TO INDICATE CONTINUOUSLY THE PERCENTAGE MODULATION OF BROADCAST & OTHER RADIO-TELEPHONE TRANSMITTERS.
Technical: SHOWS THE TYPE OF EQUIPMENT & LEVEL OF ACCURACY ACHIEVED IN THIS TIME PERIOD.
Area Notes: Unknown

Details

Markings: MFR'S PLATE: 'AMPLITUDE-MODULATION/ MONITOR/ TYPE NO.1931-A SERIAL NO.131/ GENERAL RADIO CO./ CAMBRIDGE MASS. U.S.A./ SEE LICENSE NOTICE/ U.S. PATENTS: 1,999,869; 2,012,291; 2,069,934; 2,298,177'/ PLATE: 'PROPERTY OF/ 93893/ CBC'/ DIALS ON FRONT PANEL: 'SET TORED LINE/ CARRIER/ GENERAL RADIO CO./ MF'D. BY WESTON/ MODEL 891/ G.R. MEDS-15/ 450 NOMINAL'/ '% MODULATION/ GENERAL RADIO CO./ MF'D VY WESTON/ MODEL 891 G.R. MEDS-14/ 700 NOMINAL'/ PRINTED ON PANEL: 'OVER MODULATION/ MODULATION PEAKS/ TUNE FOR MAXIMUM/ PEAKS POS. NEG./ AUDIO OUTPUT/ 600 '/ STICKER ON BACK: 'SERIAL NO./ 03-0-351/ PROPERTY OF/ CBC/ *
Missing: N/A
Finish: CRINKLED FRONT PANEL PAINTED BLACK/ BLACK KNOBS/ BLACK & WHITE PRINTING
Decoration: SYMMETRICAL KNOBS & METERS

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If you choose to share our information about this collection object, please cite:

General Radio Co., Monitor, amplitude modulation, between 1945–1957, Artifact no. 1986.0541, Ingenium – Canada’s Museums of Science and Innovation, http://collection.ingenium.ca/en/id/1986.0541.001/

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