3.6kW End-fed Off-Center EFOC8 20-6M

End‑Fed Off‑Center 20M · 17M · 15M · 12M · 10M · 6M (EFOC8)

The EFOC8 is a multi‑band end‑fed off‑center (voltage‑driven) antenna engineered for efficient operation from 20 m to 6 m. It’s a compact, rugged solution for portable, emergency, or permanent stations, offering near‑resonant operation on its supported bands with minimal compromise.

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End‑fed antennas explained · End‑fed deployment tool

Electrical Specifications

• Power Ratings — 2.4 kW version
  • 2400 W PEP @ VSWR < 2.0:1 (ICAS)
  • 1200 W PEP @ VSWR < 2.0:1 (CCS)
  • 850 W FT8/FT4 @ VSWR < 1.5:1
  • ICAS vs CCS vs Digital — what it means
• Power Ratings — 3.6 kW version
  • 3600 W PEP @ VSWR < 2.0:1 (ICAS)
  • 1800 W PEP @ VSWR < 2.0:1 (CCS)
  • 1250 W FT8/FT4 @ VSWR < 1.5:1
  • ICAS vs CCS vs Digital — what it means
• Wire Length: 7.6 m typical effective radiator We supply ≈ 8.0 m physical wire to allow fold‑back tuning and strain relief.
• Frequency Range:
  • Supports 20 m, 17 m, 15 m, 12 m, 10 m, 6 m
  • SWR varies with installation; an ATU may be required on some bands.
• Feedpoint Impedance: Integrated 4:1 UNUN — matches to 50 Ω systems
• Insertion Loss: < 0.2 dB
• Typical VSWR: < 2.5:1 on supported bands with proper deployment
• Common‑Mode Choke: Included base choke at 2.2 m; higher‑CMR upgrades recommended for QRO

Mechanical Characteristics

• Core: High‑performance ferrite, low‑loss
• Transformer: Integrated 4:1 UNUN, PTFE‑insulated windings
• Connector: SO‑239; IP66 when sealed with self‑vulcanizing tape
• Antenna Wire:
  • Premium hard‑drawn, tinned copper with XLPE sheath (outdoor‑rated), ~8 m supplied
  • Flexible stranded construction for easy handling
  • Ø ≈ 2 mm, optimized for stationary use
• Enclosure: Rugged polycarbonate, IP64, UV‑resistant, shock‑resistant
• Weight: ≈ 650 g

Deployable Frequency Range

• Covers 20 m to 6 m with near‑resonance on: 20 m, 17 m, 15 m, 12 m, 10 m, 6 m

Key Advantages

• Wide Coverage: Near‑resonant multi‑band performance without traps or coils
• Easy Deployment: Compact and fast to install — ideal for field day and base stations
• Lower RFI Risk: Included choke reduces unwanted common‑mode currents
• Built to Last: Weather‑resistant components for long‑term outdoor use
• Durable Wire: Hard‑drawn, tinned copper with XLPE jacket for longevity

Conclusion

The EFOC8 delivers the sweet spot of convenience, durability, and real‑world multi‑band performance. Whether for portable ops, emergency comms, or a permanent station, it’s a dependable performer from 20 m through 6 m.

Disclaimer on SWR & Wire Antennas

Our baseline SWR tests are performed with the antenna at 10 m AGL in an open environment. Your results will vary with height, surroundings, soil, feedline, and nearby metal. Always measure and fine‑tune after installation; fold‑back trimming is recommended to preserve wire length.