ON7FU Ferrite Applications becomes RF Guru Ferrite Applications

It is with great excitement that we announce that RF Guru has recently taken over the commercial activities of ON7FU Ferrite Applications, a leading provider of premium and effective BALUN and RF isolator products.

RF Guru will continue to produce the same range of products that ON7FU Ferrite Applications is known for, with the same commitment to quality and innovation. Our goal is to maintain and enhance the reputation that ON7FU Ferrite Applications has built over the years and to ensure that our customers receive the same level of service and support that they have come to expect.

At RF Guru, we believe that customer satisfaction is of utmost importance, and we will do everything in our power to ensure that our customers receive the best products and services possible. We understand the importance of quality, and we will maintain the same standards that ON7FU Ferrite Applications has set in terms of product quality and manufacturing processes.

We are confident that with our commitment to quality, innovation, and customer satisfaction, RF Guru will become a leading name in the industry for the ham radio and electronics enthousiast.

Product Range

  • Popular
  • 2023-F-001
  • Standard 1/1 BALUN

    For wire antennas

  • Popular
  • 2023-F-002
  • Standard 1/1 BALUN

    For the boom of a beam

    or on top of mast below rotary dipole
  • 2023-F-003
  • Standard 4/1 BALUN

    For Windom wire antennas

  • Popular
  • 2023-F-004
  • Standard 4/1 BALUN

    For KLM KT34 Yagis

  • 2023-F-005
  • Antenna Tuner BALUN


  • Popular
  • 2023-F-006
  • High Power 4/1 UNUN

    For multiband monopole rod

    and wire verticals
  • 2023-F-007
  • High Power 9/1 UNUN

    For multiband endfed

    non resonant longwire antennas
  • 2023-F-008
  • High Power 1/2 UNUN

    For short low band verticals

  • Popular
  • 2023-F-010
  • Standard Line Isolator

    High Power Optimized

    Coaxial Line Isolator
  • 2023-F-020
  • HexBeam BALUN


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