ON7FU Ferrite Applications

Professionally constructed BALUNs, UNUNs and RF Transformers for amateur radio use

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  • About Us
    • About Us
    • Feedback and Reviews
  • Legal info
    • General Conditions for Safe Use of ON7FU products.
    • Product Regulatory Compliance.
    • General Terms and Conditions.
    • Privacy Statement
    • Disclaimers.
  • Tech. Info
    • Proof of Performance / Measurement Results
    • Power Specifications: ICAS versus CCS.
    • “Why do I need a kilowatt + rated BALUN; ……. I’m never running more than 200 Watts”.
    • Correct use of ON7FU ANTENNA TUNER BALUNs.
    • Reducing RF Noise in the radio environment
    • Mounting Flanged Enclosure on Boom, Mast or Support Tube
    • BALUN: What it is and what it’s supposed to do.
    • Scenarios
    • To keep in mind.
    • Optimum Common-Mode RF Current and Noise Elimination.
    • Polycarbonate enclosures
    • Links to interesting publications.
  • Contact / Order
    • Contact / Order
  • GALLERY
  • BALUNs
    • Standard 1/1 BALUN
    • Lightweight Medium Power 1/1 BALUN
    • High Power 4/1 BALUN
    • Antenna Tuner BALUN
  • UNUNs
    • High Power 9/1 UNUN
    • High Power 4/1 UNUN
    • High Power 1/2 UNUN
  • Line Isolators
    • High Power Range Optimized Coaxial Line Isolator
    • Wideband Coaxial Line Isolator
    • Balanced Line Isolator.
    • HexBeam “BALUN”
  • RX Antenna Products
    • RX Antenna Matching Transformers
    • RX Antenna Termination Resistors
    • 75 to 50 Ohms Transformer.
  • FERRITE products
    • Toroidal Ferrites for HF
    • Ferrite Sleeves for VHF
  • Miscellaneous
    • Customization
    • Teflon Coaxial Cable.

GALLERY

Stockcorner Remote Antenna Tuner preceded by ON7FU Line Isolator
and followed by custom made ON7FU QRO TUNER BALUN.
Picture: Courtesy of LX1EL.
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Correct installation of LINE ISOLATOR.

Picture: Courtesy of ON4ATW

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Implementation of LOW HF bands optimized Common-Mode Choke at feed point of 160m tower shunt-fed vertical.

Picture : Courtesy of ON4ATW

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ON7FU HexBeam BALUN as installed at ON5PDV

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             Antenna Tuner BALUN

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Yagi version BALUN installed on boom.

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P1020876

Lightweight Medium Power wire version BALUN.

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HexBeam “BALUN”. 

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P1010200 (Small)

Low Band RX antenne matching transformer.

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P1020253 (Small)

Example of 7/16 DIN connector option on Line Isolator or BALUN.

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P1030018

Inside view of CMC UNUN Line Isolator prior to final potting.

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ferrite test setup (Small)

Setup with HP VNWA and JIG for testing BALUN and ferrite material parameters .

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P1020880

Genuine Ferrite Toroidal core products.

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High Power CMC using FT240 Toroids on 10mm Coaxial Cable.

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P1030022

Inside view of 9/1 UNUN.

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UNUN-1

4/1 UNUN Installed at bottom of vertical.

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P1020877

Potted Low Band RX antenna termination resistor.

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foto

Application example: Line Isolators at the bottom of the tower at OT2A.

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P1020891

Medium power 1/1 BALUN for beam antennas.

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600_1261

This won’t happen with an ON7FU BALUN.

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Symm_Asymm_Current I3 on shield coax

Common-Mode Sheath current flowing on the outside of a coaxial cable.

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Correct dipole pattern

Radiation pattern of a dipole when a good BALUN is used.

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Distorted dipole pattern

Radiation pattern of a dipole when NO BALUN is used.

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P1030116

Low Band RX antenna 75 to 50 Ohms transformer.

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Wideband Dual Core Stagger Tuned Coaxial Line Isolator.

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Customization: Wideband, High Power TUNER BALUN.

Cascaded Stagger Tuned:  2x FT240-31 + 2x FT240-43

Teflon insulated wire additionally inserted in Teflon sleeves.

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Ferrites as RFI suppressors on solar panel inverter.

QRM 1,5 – 30 MHz  :  S6 -> S0 by installing ferrites on AC and DC cables.

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Dipole_Coax I3 simplified

Common-Mode Current .

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cropped-Logo-ON7FU-Ferrite-Applications.jpg

This logo stands for No-Nonsens Professional Quality.

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images[2]

Unlike many other products, ON7FU products are truly CE Approved .

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