MFJ-251 – RF Switchable Dummy Load


Introducing the MFJ-251 Switchable RF Dummy Load – the ultimate tool for testing and calibrating your wattmeters and ensuring SWR accuracy. With five selectable impedance options (16.6, 25, 50, 100, and 150 Ohms) conveniently located on the front panel, this compact device offers versatility like no other.

Out of stock

SKU: 53-148 Category: Tags: , , ,


The MFJ-251 not only simulates high and low impedances but also provides SWR ratios of 3:1, 2:1, and 1:1, making it an indispensable accessory for any radio enthusiast. By allowing you to select the appropriate impedance and SWR ratio, you can fine-tune your testing equipment to achieve optimal performance.

Capable of handling up to 300W for 30 seconds at 50 Ohms, with an impressive SWR below 1.1:1 up to 30 MHz, the MFJ-251 ensures reliable and accurate readings. It covers a wide frequency range from DC to 60 MHz, guaranteeing its compatibility with various equipment.

Measuring a mere 4 1/2 (W) x 2 1/4 (H) x 6 1/2 (D) inches, this compact device is designed to fit seamlessly into your workspace without taking up valuable real estate. Its SO-239 connector ensures a secure and stable connection, so you can focus on your tests with peace of mind.

For added convenience, the MFJ-251 is compatible with the optional 12VDC/110VAC adaptor, MFJ-1312D, which allows you to power the dummy load using either a 12VDC or 110VAC power source.

Invest in the MFJ-251 Switchable RF Dummy Load and experience unparalleled versatility, accuracy, and ease of use in all your wattmeter calibration and SWR testing endeavours.

Additional information

Weight1 kg