Can I connect it directly to my tuner or PA output?

Yes. Use the coax input (PL-259 or N-type) to connect your tuner or amplifier and the M6 outputs for your ladder line.

Are the output terminals insulated from the housing?

Yes. Each M6 bolt uses a Teflon spacer to prevent creepage and surface arcing over the polycarbonate surface.

Can I use two baluns in series for more isolation?

Yes. Two in series increase CMR by about +30 dB across all bands, or combine this model with the 4-M6 tuner version for the same improvement.

Is it weatherproof for outdoor use?

Absolutely. The housing is IP64-sealed and UV-resistant for long-term exposure.

What power rating does it support?

3 kW ICAS / 1.2 kW CCS from 1.5 to 30 MHz.

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RF Guru

3kW ICAS Dual Core 1:1 Antenna Tuner Current Balun Coax <-> Open Wire

€226,00 EUR

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Tax included.

Connector PL N

Product variants

Quantity

Complementary: Stainless-Steel (RVS / INOX 316) Mounting Kit available — use the large version for this balun.

All our products are handmade, and fulfilment times may vary depending on order volume. Please allow 2–3 weeks for your order to be completed and shipped.

The 3 kW ICAS Dual-Core 1:1 Antenna Tuner Current Balun (Coax ↔ Open Wire) provides a robust transition between unbalanced coaxial feed and balanced ladder-line or open-wire systems. It ensures perfect current symmetry and isolates the tuner or station ground from feedline-borne RF currents. Built on two stacked 4″ ferrite cores with Teflon-insulated twin lead inside Teflon sleeving (24 kV/mm), it’s rated for full legal-limit operation with very low loss and high voltage margin.

Balanced Feed Transition for Tuners

This version features a single coax input (PL-259 or N-type) and two M6 stainless-steel output terminals for the balanced feedline. Each M6 bolt is isolated from the polycarbonate housing with Teflon spacers to prevent creepage and surface arcing — a critical feature under high-voltage mismatch conditions. It is ideal for use between an unbalanced tuner or amplifier output and a ladder-line antenna system.

Specifications

Ferrite cores: 2 × 4″ (10.2 cm) toroids — dual-core stack
Winding: 11 turns Teflon twin lead in Teflon sleeving (24 kV/mm)
Input connector: PL-259 or N-type (female)
Output terminals: 2 × M6 INOX 316 bolts with Teflon spacers
Enclosure: HV-coated polycarbonate (IP64) with silicone gasket and pressure valve
Power rating: 3 kW ICAS / 1.2 kW CCS continuous
Frequency range: 1.5 – 30 MHz (usable to 54 MHz)

Measured Performance (Single Unit)

Measured using EMC-standard common-mode injection methods under load. Values are conservative and verified experimentally.

Band	Choking Impedance (Ω)	Common-Mode Rejection (dB)
160 m	6.0 kΩ	47.6 dB
80 m	8.0 kΩ	50.1 dB
40 m	3.0 kΩ	41.7 dB
30 m	1.0 kΩ	32.3 dB
20 m	0.8 kΩ	30.4 dB
17 m	0.7 kΩ	29.2 dB
15 m	0.6 kΩ	28.0 dB
12 m	0.5 kΩ	26.4 dB
10 m	0.4 kΩ	24.6 dB

For extended isolation, you can add the 4-terminal 3 kW ICAS Antenna Tuner Balun in series with this coax-fed model. This setup doubles the common-mode rejection across all bands, ensuring seamless coverage from 160 to 10 m.
Alternatively, for even higher isolation on the 17–10 m range, place the 10 kW ICAS Quad-Core High-Bands (30–10 m) choke in front of it using a short coax jumper.

Mechanical Highlights

Dual-core architecture for extended thermal and magnetic headroom
Teflon twin-lead wiring with high voltage sleeving (24 kV/mm)
Two M6 stainless terminals with Teflon spacers for creepage protection
IP64 UV-resistant polycarbonate housing with HV coating and gasket
Weight: approx. 700 g

Technical Validation — How We Measure It
All RF.Guru baluns are tested using true common-mode injection methods. Residual current is measured with a precision current probe to derive Common-Mode Rejection (CMR in dB). This procedure reflects actual field suppression rather than differential VNA plots and complies with EMC measurement standards.

Mini-FAQ

Q: Can I connect it directly to my tuner or PA output?
— Yes. Use the coax input (PL-259 or N-type) to connect your tuner or amplifier and the M6 outputs for your ladder line.
Q: Are the output terminals insulated from the housing?
— Yes. Each M6 bolt uses a Teflon spacer to prevent creepage and surface arcing over the polycarbonate surface.
Q: Can I use two baluns in series for more isolation?
— Yes. Two in series increase CMR by ≈ +30 dB across all bands or combine this model with the 4-M6 tuner version for the same boost.
Q: Is it weatherproof for outdoor use?
— Absolutely. The housing is IP64-sealed and UV-resistant for long-term exposure.
Q: What power rating does it support?
— 3 kW ICAS / 1.2 kW CCS from 1.5 to 30 MHz.

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Written by Joeri Van Dooren, ON6URE — RF engineer, antenna designer, and founder of RF.Guru, specializing in high-performance HF/VHF antennas and RF components.