Monitor, amplitude modulation

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Ingenium, 1985.0591.001
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OBJECT TYPE: N/A
DATE: 1945–1955
ARTIFACT NUMBER: 1985.0591.001

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

More Information

General Information

Serial #: 361
Part Number: 1
Total Parts: 1
AKA: N/A
Patents: N/A
General Description: The body is metal/the gauges are bakelite as are the knobs/the protective covering for the gauge mechanism is plexiglass/the internal components are ferrous metals, brass and aluminum/glass, bakelite and ceramic materials are also present.

Dimensions

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

Length: 48.0 cm
Width: 26.2 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: Ontario
Period: 1950s & 1960s
Canada: Used in Canada at CKSL-AM radio station, London, Ontario.
Function: This monitor is designed for monitoring the modulation percentage of a.m. transmitters.
Technical: Example of modulator measuring equipment required by broadcast stations to meet government requirements.
Area Notes: Unknown

Details

Markings: Mfr's plate on casing front bears following info.: 'AMPLITUDE-MODULATION/MONITOR/TYPE NO./1931-A/SERIAL NO. 361/GR/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 on casing back: 'F.C.C. APPROVAL NO. 1555'/All meters, dials, connections, etc. labelled.
Missing: power cord & screws
Finish: The monitor panel is painted a grey-brown colour, while the rear and side panels are a silver metal. The knobs are black, and the switc h hardware, etc., is a white metal.
Decoration: N/A

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

General Radio Co., Monitor, amplitude modulation, circa 1945–1955, Artifact no. 1985.0591, Ingenium – Canada’s Museums of Science and Innovation, http://collection.ingeniumcanada.org/en/id/1985.0591.001/

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