MFJ Enterprises, based in Starkville, Mississippi, was founded in 1972 by Martin F. Jue and has become the world's largest manufacturer of amateur radio accessories. Its extensive product line includes antenna tuners, analyzers, power supplies, filters, and many other devices, earning it the reputation among radio enthusiasts that "MFJ makes everything."
Half a century of radio-frequency engineering provides high-end audio salons with essential expertise in managing radio-frequency interference (RFI). The same advanced filtering, grounding, impedance, and shielding techniques that ensure clean shortwave transmissions are equally effective at protecting audio systems from interference in today’s transmitter-rich environment.
Reference Studio offers MFJ products to two key groups: Baltic radio amateurs seeking the classic catalog, and audiophiles who require the interference control that only experienced RF engineers can provide.
Fifty Years of RF Mastery
Radio amateurs operate in challenging electromagnetic environments where interference is common. MFJ has spent five decades developing tools that enable ham stations to extract microvolt signals despite these conditions.
MFJ addresses key engineering challenges relevant to both radio and audio. Its products include low-pass, high-pass, band-pass, and notch filters to isolate desired signals. MFJ also offers solutions for proper RF grounding, such as artificial grounds and ground-line chokes. The company’s antenna tuners provide precise impedance matching, applying the same principles found in audio cable interfaces. For common-mode suppression, MFJ supplies snap-on chokes, line isolators, and current baluns to remove unwanted RF from conductors.
MFJ’s regulated power supplies and distribution panels provide clean power to radio stations, where any noise is immediately detectable across the bands, presenting a more rigorous test than typical audio environments.
MFJ’s design culture emphasizes American pragmatism, with honest specifications, repairable construction, and pricing aimed at engineers who value measurable results. The company offers fifty years of proven solutions, readily available from stock.
From Ham Shack to Listening Room
MFJ offers thousands of products. Reference Studio selects those most relevant to our two main customer groups.
For radio amateurs, we offer a comprehensive selection: antenna tuners, from compact manual models to high-power Versa Tuners; antenna analyzers; SWR meters; dummy loads; switches; and a full range of station accessories. Our power supplies and distribution units are clean, regulated, and protected. We also provide keys, keyers, clocks, and many other solutions that have built MFJ’s reputation for versatility. Baltic customers benefit from local warranty and support, eliminating the need for overseas arrangements.
For audiophiles, we provide a comprehensive interference toolkit. Modern listening environments are exposed to RF from sources such as switching power supplies, Wi-Fi, cellular signals, LED lighting, and solar inverters. These can infiltrate cables and bypass standard audio protections. MFJ’s common-mode chokes and line isolators remove RF from power, signal, and network lines, while our AC filtering and grounding products address noise at the electromagnetic level, beyond the reach of typical audio conditioners. These solutions address common issues such as unexplained brightness, intermittent buzz, cellular interference in phono stages, and overall system glare caused by RF.
Both groups benefit from MFJ analyzers and meters, which enable precise problem identification and informed solutions, following best practices in RF diagnostics.
The Starkville Institution
MFJ has played a significant role in amateur radio history. For generations, enthusiasts worldwide have relied on MFJ for their first tuner, analyzer, and many essential accessories, all bearing the Starkville label. Under Martin F. Jue's leadership, the company integrated sister brands such as Ameritron, Hy-Gain, Cushcraft, and Vectronics, offering a comprehensive range of products from QRP devices to legal-limit amplifiers.
The company maintains traditional values, providing clear catalogs, reliable product delivery, and pricing that supports hobbyists.
For Reference Studio's clients, MFJ offers a unique advantage by supporting both living room music systems and outdoor antenna installations with equal engineering expertise.
Why choose MFJ?
Electromagnetic interference affects all electronics, and MFJ is uniquely engineered to address these real-world challenges.
For radio amateurs, MFJ offers the most comprehensive accessory catalog in the hobby’s history, backed by over fifty years of experience. From tuners and analyzers to supplies and antennas, including Hy-Gain and Cushcraft, MFJ provides a single source with fair pricing and now official availability in the Baltics with local support. Whether you are building your first station or upgrading a contest setup, the Starkville catalog remains the standard.
For audiophiles, MFJ addresses issues that traditional audio brands often overlook. While high-end audio may rely on costly trial and error to address RF interference, MFJ applies precise measurement and proven components. Properly installed common-mode chokes, often costing less than a single audiophile fuse, have resolved more cases of unwanted noise and harshness than many popular upgrades. When your phono stage picks up radio signals, or your streamer produces interference, the solution comes from Starkville, not from luxury packaging.
For both audiences, MFJ stands for practical engineering: transparent specifications, repairable products, and a catalog focused on real solutions rather than trends. Among premium brands, MFJ earns its place through proven performance.
Referenz Studio stocks and demonstrates MFJ in Riga and offers expert diagnosis. Describe your interference issue or bring the affected component, and we will identify and resolve the RF problem. Benefit from fifty years of radio expertise applied to your audio system.
