MFJ-4103 (3 Amp) Switch Mode Power Supply for FT-818


This MFJ-4103 Miniature Switching Power Supply can deliver up to 40 Watts (13.8 VDC at 2.89 Amps) of reliable power anywhere in the world!

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Its an incredibly tiny 4 ⅛” x 2 ⅝” x 1 ⅜” and weighs just 10 ounces including output power cord and connector. It has an output DC cable with a standard MFJ coaxial DC power connector (2.1 mm ID, 5.5 mm OD) that fits most MFJ and other ham accessories and QRP rigs. A sturdy adapter cable is also included for use with the Yaesu FT-817. Its perfect for QRP rigs needing up to 2.89 Amps.

The MFJ-4103 Mini Switching Power Supply works for input voltages 100 – 240 VAC and power line frequencies 47 – 63 Hz. Use the MFJ-4103 almost anywhere in the world by plugging in an AC power cord with an appropriate wall plug for that country (not included, laptop computer AC cord recommended).

The MFJ-4103 is protected from overvoltage, overcurrent, and overtemperature. It has excellent 1% line and 5% load regulation and 1% peak to peak ripple and noise. Operating temperature is 0 – 40 degrees Celsius. Mean time between failure is 100,000 hours at full load at 25 degrees Celsius ambient. It meets FCC part 15 class B, UL 1950 and CSA 22.2.

Additional information

Weight 0.5 kg