• Country
• United States of America (USA)

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

• Year
• 1980 ??

• Category
• Amateur Equipment (Other, but not Key)

• Radiomuseum.org ID
• 190853

• Wave bands
• - without

• Power type and voltage
• Line / Storage batteries (perhaps also batteries) / 12 Volt

• Loudspeaker
• - This model requires external speaker(s).

• Power out
• 0.15 W (unknown quality)

• Material
• Metal case

• from Radiomuseum.org
• Model: Super RTTY Audio Filter MFJ-725 - MFJ Enterprises; Starkville MS

• Shape
• Tablemodel without push buttons, Mantel/Midget/Compact up to 14

• Dimensions (WHD)
• 88 x 35 x 110 mm / 3.5 x 1.4 x 4.3 inch

• Notes
• Bandpass audio noise filter with a center frequency of 2210 Hz(midway between 2125 Hz and 2295 Hz used in audio frequency keying); to use in conjunction with a radio receiver (or transceiver) and a RTTY terminal when receiving RTTY; two bandwith selector-WIDE and NARROW; the OFF/BYPASS position of the power switch bypass the filter; audio INPUT (from receiver) and audio OUTPUT (to RTTY terminal unit) on the back of the filter with RCA connectors; another audio OUTPUT on the back to Speaker.

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

• Source of data
• -- Original prospect or advert

• 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)