RCA "Radiola 24" portable radio receiver
date: label: date made
content: ca 1925
name: label: maker
content: Armstrong, Edwin Howard
notes: label: Description (Brief)
content: Marked: "Radiola 24 / Portable Superheterodyne / Second Harmonic", licensing data also listed. Receiver employs the second-harmonic superheterodyne developed by Edwin Howard Armstrong and Harry Houck. The local oscillator, in this circuit, has the second harmonic heterodyned with the incoming signal frequency. Difficulties that arose in practice were image frequencies formed that caused repeated stations along the dial. This unit used a plug in loop antenna that mounted on top of receiver. Original price - $195.00. REF: four photos, including picture of interior construction, are in the Clark Collection: CL45 - "Battery Type Radiolas." "Langley Set Index", page 58.
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.320783
label: catalog number
content: 320783
label: accession number
content: 241556
objectType: label: Object Name
content: radio receiver
physicalDescription: label: Measurements
content: overall: 15 in x 21 in x 7 1/4 in; 38.1 cm x 53.34 cm x 18.415 cm