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
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The 10 kW CCS 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.
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
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 10 kW CCS Antenna Tuner Balun in series (2m open wire in between) 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.
Maximum ICAS/CCS Power Ratings
| Connector Type | 160–40 m Band | 30–10 m Band | 6–2 m Band | Limiting Factor |
|---|---|---|---|---|
| PL-259 / UHF | ≈ 2.7 kW ICAS | ≈ 1.3 kW ICAS | ≈ 0.6 kW ICAS | Connector |
| Type-N | ≈ 10 kW ICAS | ≈ 5 kW ICAS | ≈ 2 kW ICAS | Coax |
| 7/16 DIN | ≈ 10 kW CCS* | ≈ 5 kW ICAS | ≈ 2 kW ICAS | Coax |
*For full 10 kW CCS operation, add the 4-terminal 10 kW CCS Antenna Tuner Balun in series (2m open wire in between), and equipped with dual ventilation ports instead of the standard single decompression valve. 10 kW CCS operation is limited to 160-40M, with 40M borderline !
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
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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