• Country
• United States of America (USA)

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

• Year
• 1987 ?

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

• Radiomuseum.org ID
• 278930

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

• Wave bands
• Wave Bands given in the notes.

• Power type and voltage
• No Power needed

• Material
• Metal case

• from Radiomuseum.org
• Model: Artificial RF Ground MFJ-931 - MFJ Enterprises; Starkville MS

• Dimensions (WHD)
• 7.5 x 3.5 x 7 inch / 191 x 89 x 178 mm

• Notes

• Frequency Range from 1.8 MHz up to 30 MHz. Maximum power input 300 W. The MFJ-931 creates an artificial ground with a random lenght of wire thrown on the floor. This produces a tuned counterpoise. Also, the MFJ-931 will electrically place a far away RF ground directly at any receiver or/and transmitter. It effectively places any radio equipment near actual earth ground potential even if the equipment is on the second or higher with no earth ground possible.

• Net weight (2.2 lb = 1 kg)
• 0.920 kg / 2 lb 0.4 oz (2.026 lb)

• Price in first year of sale
• 80.00 USD

• 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)