• Country
• United States of America (USA)

• Manufacturer / Brand
• MFJ Enterprises; Starkville (MS)

• Year
• 1992 ?

• Category
• Radio module post 1925 (not a part, not a key)

• Radiomuseum.org ID
• 211137

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

• Number of Transistors

• Semiconductors
• MC1458

• Main principle
• Audio-Amplification

• Wave bands
• - without

• Power type and voltage
• Powered by external power supply or a main unit. / 12 Volt

• Loudspeaker
• - For headphones or amp.

• Material
• Various materials

• from Radiomuseum.org
• Model: Narrow Audio CW Filter Module MFJ-726 - MFJ Enterprises; Starkville MS

• Shape
• Chassis only or for «building in»

• Dimensions (WHD)
• 55 x 25 x 70 mm / 2.2 x 1 x 2.8 inch

• Notes
• Plug-in CW Audio Filter for MFJ QRP 90xx serie Transceivers (i.e. MFJ 9015, 9020, 9017, 9040); passband centered at 700Hz; the filter is activated by a pushbutton switch; based on MC1458 dual op-amp; reduce interference caused by adjacent-channel stations and atmosferic noise.

• Net weight (2.2 lb = 1 kg)
• 0.1 kg / 0 lb 3.5 oz (0.22 lb)

• Source of data
• -- Original-techn. papers.

• Author
• Model page created by Emilio Focosi. See "Data change" for further contributors.

• Other Models

• Here you find 67 models, 65 with images and 41 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from MFJ Enterprises; Starkville (MS)