National type TRW-VHF radio transceiver
date: label: date made
content: ca 1935
name: label: maker
content: National Company
notes: label: Description (Brief)
content: Plate reads: "National Type TRW / National Company, Inc. / Malden, Mass. U.S.A." This unit is a VHF transceiver employing a #30 and #33 tube. Two audio transformers are used (type TR1 and TR2). A relay is included in unit. Power controls include tuning capacitor, send-receive switch, volume control, and Off-On switch. Unit mounted in wooden case with a leather handle and key. Includes an unmarked Tung-Sol pentode, and a National NU 30 R triode.
label: Description (Brief)
content: The TRW is an amateur radio transceiver designed for the old 5 meter amateur radio band, i.e. 56-60 MC. When used as a receiver the type 30 functions as a self-blocking superregenerative detector, transformer coupled to the 33 used as an audio amplifier. When used as a transmitter, the type 30 tube functions as an oscillator and the type 33 as a modulator. The transformer, TR1, serves to couple the microphone to the grid of the 33, while the primary of the TR2 becomes a Heising modulation choke. Allied Van Lines shipping tag #65 on unit. Reference: "A Portable Transceiver for Ultra-High Frequency Operation," (undated).
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.320825
label: accession number
content: 241556
label: catalog number
content: 320825
objectType: label: Object Name
content: radio receiver
label: Object Name
content: radio transceiver
physicalDescription: label: Measurements
content: overall: 10 1/4 in x 16 in x 8 1/4 in; 26.035 cm x 40.64 cm x 20.955 cm