End-Fed Off-Center 80M 40M 30M 20M 17M 15M 12M 10M (EFOC29)

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The EFOC29 is a multi-band end-fed off-center antenna designed for exceptional performance across HF bands, including 80m to 10m. This antenna provides reliable, efficient communication for portable, emergency, or permanent installations, ensuring resonance across its frequency range with minimal compromise.

End-Fed antennas explained

End-Fed antennas deployment tool

Electrical Specifications

• Power Ratings:
  • 2400W PeP ICAS (Intermittent Commercial and Amateur Service)
  • 1200W PeP CCS (Continuous Commercial Service)
  • 600W FT8/FT4
  • For ICAS and CCS power definitions, More info
• Wire Length: 28.96m
• Frequency Range:
  • Covers 80m, 40m, 30m, 20m, 17m, 15m, 12m, and 10m bands.
    
  • 80m, 60m and 30m may require a tuner.
• Feedpoint Impedance: Integrated 4:1 UNUN transformer for precise impedance matching to 50-ohm systems.
• Insertion Loss: Less than 0.2 dB, ensuring maximum power transfer.
• VSWR: Typically less than 2.5:1 on supported bands with proper deployment.
• Common-Mode Choke: Included at 13m (beads over coaxial cable) to reduce RFI and unwanted currents.

Mechanical Characteristics

• Core: High-performance ferrite core optimized for stability and low loss.
• Transformer: Integrated 4:1 impedance transformer with heat-resistant Teflon wire.
• Connector: Professional-grade SO239 connector, weatherproof to IP66 when sealed.
• Antenna Wire:
  • Premium 29m of hard-drawn, tinned copper wire with a cross-linked polyethylene (XLPE) sheath for exceptional durability and weather resistance.
  • Flexible stranded construction ensures ease of deployment and handling.
  • Diameter: 2mm, specifically designed for stationary use, providing a robust and long-lasting solution for outdoor installations.
• Enclosure: Rugged polycarbonate housing, waterproof to IP64, UV-resistant, and shockproof.
• Weight: Approx. 650g. 

Deployable Frequency Range

• Covers 40m to 10m, with near resonance on:
  • 80m, 40m, 20m, 15m and 10m.
  • 80m, 60m, 30m, 15m, 12m and 10m may require a tuner.

Key Advantages

• Wide Frequency Coverage: Near resonant on multiple HF bands without traps or coils.
• Ease of Deployment: Easy to install, ideal for field-day and permanent setups.
• Reduced RFI: Integrated common-mode choke eliminates unwanted currents.
• Rugged and Weatherproof: Built to withstand the elements, making it suitable for long-term outdoor use.
• Durable Antenna Wire: Hard-drawn, tinned copper wire with XLPE sheath ensures superior longevity and performance, even in harsh conditions.

Conclusion

The EFOC29 is the perfect solution for amateur radio enthusiasts seeking a multi-band antenna that delivers performance, durability, and versatility. Whether you're setting up for field-day operations, emergency use, or a permanent station, the EFOC29 ensures reliable communications with minimal effort.

Disclaimer on SWR and Wire Antennas

At RF.Guru, all our antenna tests, including SWR measurements, are conducted under controlled conditions with the antenna installed at a standard height of 10 meters above ground level in an open environment. These tests are designed to provide a baseline for performance and ensure consistency across our product evaluations.

However, it is important to note that SWR and antenna performance can vary significantly based on several factors, including but not limited to:

• Installation Height: Antennas mounted higher or lower than 10 meters may exhibit different SWR values.

• Surrounding Environment: Proximity to trees, buildings, or other structures can impact performance due to reflections and absorption.

• Ground Conductivity: Soil composition, moisture levels, and terrain can influence radiation patterns and impedance.

• Feedline Length and Quality: Variations in coaxial cable length, quality, or the presence of common-mode currents can affect SWR readings.

• Nearby Metal Objects: Power lines, fences, or other metallic objects can introduce detuning effects.

We recommend that customers perform SWR measurements after installation to fine-tune their setup for optimal performance in their specific environment. If you have any questions or encounter challenges, our team is available to provide guidance and support.