MFJ-225 – 1.8-170 MHz Graphic Antenna Analyzer


Introducing the MFJ-225 – 1.8-170 MHz Graphic Antenna Analyzer, the ultimate tool to take your RF testing to new heights. With its advanced features and user-friendly design, this analyzer is a must-have for any RF enthusiast or professional.


The MFJ-225 combines all the essential analyzer functions you rely on with a range of innovative capabilities. Equipped with a built-in LCD graphics display, this compact handheld analyzer provides a clear and detailed view of your measurements. Whether you’re making fine circuit adjustments or capturing SWR, impedance, return loss, or phase angle data, the 3-inch backlit display ensures you never miss a thing.

One of the standout features of the MFJ-225 is its versatility. In the field, it functions as a standalone handheld analyzer, allowing for quick and convenient measurements. However, when paired with your PC, it transforms into a fully-fledged two-port (S21) desktop machine. Utilize the IG-miniVNA freeware to perform detailed data analysis and generate stunning color-graphic plots that document your work with precision.

With continuous HF-VHF coverage from 1.5 MHz to 179.9 MHz, the MFJ-225 offers rock-solid stability and unbeatable performance. Its state-of-the-art programmable DDS generator ensures pin-point 1-kHz frequency resolution, eliminating the need for mechanical band switches or tuning elements. You can effortlessly adjust the centre frequency, tuning step, and sweep width, giving you complete control over your measurements.

The MFJ-225 is not just an analyzer; it’s also a powerful clean signal source. Thanks to the DDS stimulus generator, you have a levelled -5 dBm signal source at your disposal. This allows you to drive mixers, low-power amplifiers, filters, networks, diplexers, and antennas with ease. Moreover, the signal generated by the MFJ-225 is exceptionally clean, with over -50 dBc of harmonic and spur suppression, surpassing even precision lab generators costing thousands of dollars.

Get ready to work faster and smarter with the MFJ-225’s information powerhouse capabilities. It simultaneously compiles and displays all critical parameters on a single screen, providing you with a comprehensive overview of your measurements at a glance. Say goodbye to scrolling through menus or making tedious conversions—the MFJ-225 streamlines your workflow, ensuring you spend less time on manual tasks and more time on what matters most.

The MFJ-225 measures an impressive range of parameters, including SWR (1:1 to 9.9:1), complex impedance (R+jX), impedance magnitude (Z), return loss (RL, 0-30dB), phase (0-180°), capacitance (0-9999pF), inductance (.1uH-80uH), cable length (0.5-45m), and cable loss (0-30dB). This comprehensive set of measurements allows you to gain deep insights into the performance of your RF systems.

Thanks to its two-port (S21) forward-power measurement capabilities, the MFJ-225 goes beyond traditional single-port analyzers. These additional measurements are essential for optimizing filters, diplexers, matching networks, and more. By bridging the gap between a simple scalar analyzer and true vector-analysis performance, the MFJ-225 empowers you to achieve optimal results in your RF designs.

Operating the MFJ-225 is a breeze, thanks to its ergonomic design and intuitive interface. The graphic display enhances usability by providing more information at your fingertips without the need for excessive scrolling. Moreover, the layout is designed for convenience, with three large soft-touch selector buttons placed next to the screen and a large side-mounted frequency control knob positioned for your right hand. With everything precisely where you need it, you can focus on your measurements without any distractions. Powering the MFJ-225 is hassle-free. It can run on four AAA alkaline batteries.


  • Built-in back-lighted 3-inch LCD graphic display
  • Continuous HF-VHF Coverage
  • Tunes from 1.5 MHz to 179.9 MHz with rock-solid stability and no gaps
  • Powerful Clean Signal Source
  • SWR 1:1 to 9.9:1
  • Complex Impedance: R+jX
  • Impedance Magnitude: Z
  • Return Loss: RL, 0 – 30 dB
  • Phase: 0 – 180°
  • Capacitance: 0 – 9999 pF
  • Inductance: 1 – 80 uH
  • Cable Length: 0.5 – 45 m
  • Cable Loss: 0 – 30 dB
  • Two-Port Flexibility
  • Self-Calibrating
  • MFJ-225 requires 4 NiMh AAAcells or optional power adapter MFJ-1312
  • PC interface requires a USB Type-B cable
  • The analyzer’s OUT port is SO-239. IN port is SMA-female
  • Size: 3 3/32 (W) x 6 1/8 (H) x 1 1/2 (D) inches
  • Weight with Batteries: 500 g
  • Typical 12V power consumption is 230 mA, increasing to 550 mA when batteries are recharging at max

Additional information

Weight1.5 kg