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An 80-10 end-fed half-wave antenna can be a very good performing part of an HF station. But its performance depends heavily on a well-designed and carefully constructed 49:1 unun, which matches the long wire impedance to within tuning range of operation. But the perfor-mance of an end-fed antenna is also very dependent on height above ground ...
The 80-10-JR-KW consists of the two components shown in Figure 1 – the antenna wire and an impedance transformer. Designed to be used on 80, 40, 20, 15, and 10 meters, the EFHW antenna wire is approximately one half-wavelength long on 40 meters with a coil and extension that add 80 meter operation.
MANUAL: ENDFEDZ ALLBAND-KW 80-10 EFHW 1KW ICAS ANTENNA The EFHW (End-Fed Half-Wave) antenna is one of amateur radio’s oldest antenna designs. Originally known as the “end-fed Zepp,” it was used by airships (known as “Zeppelins”) suspended from the fed end with the free end hanging loose.
Detailed Build Instructions for the 80-10 end-fed half-wave antenna with 49:1 unun: Noji-Article-80-10-EF-HW.pdf Source: https://noji.com/hamradio/pdf-ppt/noji/Noji-Article-80-10-EF-HW.pdf
Installation Tips. Weather you bought one of our multiband models like the EFHW-8010/7510, EFHW-4010 or a transformer like the MEF-330, MEF-107 etc. these basic rules apply to any antenna installation. All antennas need to be as far as possible from ground, antennas, wires, homes and similar.
This project assembles a 49:1 ferrite-core (“FT”) type #43 transformer that matches 50 ohm input to 2500 ohm end fed antenna. It is optimized for 3.5/7/10/14 MHz but will work reasonably well on all amateur bands from 80 meters thru 10 meters with a 135 foot length of wire and a short connection to ground.
EFHW-8010-1K EFHW ANTENNA The perfect antenna for DXing, EMCOM, ALE HF-link sta-tions, NVIS, MARS, ARES, RACES … Various installations such as horizontal, vertical, an inverted V, as well as inverted L, zigzag etc. are possible. Measured VSWRs are taken with the antenna in an in-verted V shape with the center of
