• Country
• Great Britain (UK)

• Manufacturer / Brand
• Marconi Instruments, Marconi-Ekco (MI, MEI)

• Year
• 1942 ?

• Category
• Service- or Lab Equipment

• Radiomuseum.org ID
• 82841

Click on the schematic thumbnail to request the schematic as a free document.

• Number of Tubes
• 1

• Valves / Tubes
• HL23 or HL23DD

• Power type and voltage
• Dry Batteries / 1.5 Volt

• Loudspeaker
• - For headphones or amp.

• Material
• Metal case

• from Radiomuseum.org
• Model: Wavemeter T.F. 643 A - Marconi Instruments, Marconi-

• Dimensions (WHD)
• 280 x 250 x 180 mm / 11 x 9.8 x 7.1 inch

• Notes
• Ondametro della Marconi Cerco schema The instrument was supplied with2 valves - one a spare. 4 frequency ranges, 20-37 / 37-70 /70-130 /130-300MHz. The circuit uses the grid of the HL23 as a diode or the diode of the HL23DD. Headset socket provided.

• Net weight (2.2 lb = 1 kg)
• 5.9 kg / 12 lb 15.9 oz (12.996 lb)

• Source of data
• -- Collector info (Sammler)

• Author
• Model page created by Rino Ferro † 2008. See "Data change" for further contributors.

• Other Models

• Here you find 94 models, 81 with images and 39 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Marconi Instruments, Marconi-Ekco (MI, MEI)