4kW End-Fed Half-Wave Antenna 80M 40M (EFHW8040)

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The EFHW8040 is a multi-band end-fed half-wave antenna designed for exceptional performance across HF bands, including 80m, 40m. 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:
  • 4000W ICAS (Intermittent Commercial and Amateur Service)
  • 2000W CCS (Continuous Commercial Service)
  • 1500W FT8/FT4
  • For ICAS and CCS power definitions, More info
• Frequency Range:
  • Covers 80m, 40m.
    
• Feedpoint Impedance: Integrated 70:1 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 2:1 on supported bands with proper deployment.

Mechanical Characteristics

• Core: High-performance ferrite core optimized for stability and low loss.
• Transformer: Integrated 68:1 impedance transformer with heat-resistant Teflon wire.
• Connector: Professional-grade N connector, weatherproof to IP66 when sealed.
• Antenna Wire:
  • Premium 41m 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 80m to 40m, with resonance on: 
  • 80m, 40m.
    

Power Handling Notes

• For VSWR values < 2.0:1:
  • 4000W ICAS
  • 2000W CCS
  • 1500W FT8/FT4 (high duty cycle modes)
• For VSWR values > 2.0:1, power de-rating is advised:
  • < 1500W PeP for VSWR > 3:1
  • < 1000W PeP for VSWR > 5:1

Key Advantages

• Wide Frequency Coverage: 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 EFHW8040 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 EFHW8040 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 15 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.