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RF Guru

10kW CCS Dual Core 1:1 Antenna Tuner Current Balun Coax <-> Open Wire

10kW CCS Dual Core 1:1 Antenna Tuner Current Balun Coax <-> Open Wire

€226,00 EUR
€226,00 EUR
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Connector
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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 10 kW CCS Dual-Core 1:1 Antenna Tuner Current Balun (Coax ↔ Open Wire) provides a robust and symmetric transition from unbalanced coax to balanced ladder-line or open-wire systems. It ensures true current balance, prevents RF feedback, and maintains high CM rejection even under extreme mismatch voltages. Built around two stacked 4″ toroids and a Teflon bifilar twin-lead winding, it offers amplifier-grade performance at legal-limit power.

Related reading:
Correct Use of RF.Guru Antenna Tuner Baluns
Baluns in a Nutshell
How Much Choking Do You Really Need — for RX and TX?

Balanced Feed Transition for Tuners

Includes a single coaxial input (PL-259 or N-type) and two M6 INOX terminals for ladder-line output. Each terminal uses Teflon insulation for extreme HV creepage margin — essential for tuner-fed systems with high SWR.

Why Bifilar Windings?

The Teflon twin-lead winding provides:

  • Excellent differential-mode balance
  • High voltage standoff due to Teflon spacing + sleeving
  • Low inter-winding capacitance under mismatch
  • Predictable |ZCM| even with severe SWR

Although not coaxial, the balun develops a high, real common-mode impedance. The numbers below are from true CM measurements — not differential S-parameters.

Specifications

  • Cores: 2 × 4″ ferrite toroids
  • Winding: 11 turns Teflon twin-lead (24 kV/mm)
  • Input: PL-259 or N-type
  • Output: 2 × M6 INOX terminals with Teflon spacers
  • Enclosure: HV-coated polycarbonate, gasket, pressure valve
  • Power rating: 3 kW ICAS / 1.2 kW CCS (single), 10 kW CCS in series
  • Frequency: 1.5–30 MHz (usable to 54 MHz)

Measured Performance (Single Unit)

Measured using EMC-standard common-mode injection with calibrated sensing.

Band Choking Impedance (Ω) Impedance-Equivalent dB (from |Zc|)
160 m 12.0 kΩ 53.6 dB
80 m 16.0 kΩ 56.1 dB
40 m 6.0 kΩ 47.6 dB
30 m 2.0 kΩ 38.1 dB
20 m 1.6 kΩ 36.1 dB
17 m 1.4 kΩ 35.0 dB
15 m 1.2 kΩ 33.6 dB
12 m 1.0 kΩ 32.0 dB
10 m 0.8 kΩ 30.1 dB
*Impedance-Equivalent (dB) values are computed directly from |ZCM| using a 50 Ω common-mode source reference. They represent the balun’s intrinsic suppression capability — not the CM impedance of a real ladder-line antenna system. More details: Why dB Attenuation Specs on Ham Chokes Are a Mess.*

Add a 10kW antenna tuner balun in series to double ZCM and increase intrinsic suppression by ≈ +6 dB. This is mainly for thermal and magnetic headroom, not for dB stacking.

Maximum ICAS/CCS Power Ratings

Connector Type 160–40 m 30–10 m 6–2 m Limiting Factor
PL-259 / UHF ≈2.7 kW ICAS ≈1.3 kW ≈0.6 kW Connector
N-type ≈10 kW ICAS ≈5 kW ≈2 kW Coax
7/16 DIN ≈10 kW CCS* ≈5 kW ≈2 kW Coax

*Full 10 kW CCS requires adding a 10kW antenna tuner baluns in series (or a 10kW choke in front) with ≈2 m spacing. This shares thermal and magnetic load; dB does not add linearly.

Mechanical Highlights

  • Dual 4″ stacked cores
  • Teflon twin-lead winding (24 kV/mm)
  • M6 INOX terminals with Teflon isolation
  • IP64 UV-resistant polycarbonate housing
  • Approx. 700 g
Technical Validation — How We Measure It
All RF.Guru baluns are measured using EMC-standard dual-probe CM testing. One probe injects controlled common-mode current; the other measures residual CM current.

This yields true Common-Mode Rejection (CMR) — actual CM current reduction — not differential-mode artifacts from VNA sweeps.

Differential VNAs excite the coax in differential mode. Our EMC method measures true CM suppression under load, exactly as seen in tuner-fed systems.

Mini-FAQ

  • Q: Can I connect it directly to my tuner?
    — Yes. Coax in → tuner; M6 terminals → ladder line.
  • Q: Why bifilar winding?
    — It maximizes HV tolerance, balance, and stability under mismatch.
  • Q: Do two units double the dB?
    — No. They add ≈ +6 dB and greatly improve thermal headroom.
  • Q: Outdoor safe?
    — Yes. Fully sealed IP64 enclosure.
  • Q: Power rating?
    — 3 kW ICAS / 1.2 kW CCS per unit; 10 kW CCS with two in series.

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Written by Joeri Van Dooren, ON6URE — RF engineer, antenna designer, and founder of RF.Guru.
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