Monitor, amplitude modulation
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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
CITE THIS OBJECT
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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