U.S. Army Signal Corps model BC-9-A radio transceiver
date: label: date made
content: c 1929
label: date made
content: ca 1929
name: label: maker
content: National Electrical Supply Company
notes: label: Description (Brief)
content: Marked: "Signal Corps U.S. Army / Radio Receiver & Transmitter / Type BC-9-A / Used with CW Loop Radio / Telegraph Type SCR 77-B / Designed at Radio Laboratories / Fort Monmouth, New Jersey / Order No. 2448-NY-29 / Date: May 8, 1929 Serial No. 34 / Made by: National Electric Supply Co. / Washington, D.C." Transceiver is a military type field unit with a carrying strap. Panel controls include a plate current millimeter, plate current control, tuner, oscillator filament resistors, key, telephone jacks, and binding post terminals for plate and filament batteries. In receive position the circuit is a regenerative detector with two stage audio amplifier. Three VT-1 tubes are employed. A telegraphy key on the panel keys the transmitter in the depressed position and allows the receiver to function in the up position. A single pole switch mounted on the panel cuts a .5 ohm oscillator tube filament resistance in and out for the purpose of adjusting maximum radiated energy. Reference: "Circuit Diagram & Operating Instructions for Radio Transmitter & Receiver Type BC-9-A" (attached to lid over panel).
label: Location
content: Currently not on view
setName: label: See more items in
content: Work and Industry: Electricity
creditLine: label: Credit Line
content: from Franklin Wingard
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: EM.321023
label: catalog number
content: 321023
label: accession number
content: 241556
label: serial number
content: 34
objectType: label: Object Name
content: variocoupler
label: Object Name
content: transceiver
physicalDescription: label: Measurements
content: overall: 11 7/8 in x 10 3/4 in x 8 1/2 in; 30.1625 cm x 27.305 cm x 21.59 cm