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The EFHW antenna is one of amateur radio’s oldest antenna designs. EFHW stands for “End Fed Half wave” and was first introduced way back in 1927 by the Austrian radio amateur, Dr. Josef Fuchs,
MFJ-1982LP/MP/HP and MFJ-1984LP/MP/HP Instruction Manual General Description General Description: End-Fed Horizontal Wire antennas (or EFHWs) cover multiple bands without traps, stubs, or resonators. End-fed wires resonate on their 1/2-wave fundamental frequency plus all odd and even harmonics above.
Typical installation of an EFHW antenna at about 6ft above ground or higher. You can use inexpensive flag poles as support at the end or in the middle of the wire. Tall trees and other structures of 20 feet or higher as support are even better.
View and Download MFJ -1982LP instruction manual online. End-Fed Horizontal Wire Antennas. MFJ-1982LP antenna pdf manual download. Also for: Mfj-1982mp, Mfj-1982hp, Mfj-1984lp, Mfj-1984hp, Mfj-1984mp.
End-Fed Horizontal Wires (EFHW) cover multiple bands with-out traps, stubs, or resonators. End-fed radiators have the unique quality of resonating on the 1/2-wave fundamental frequency plus odd/even harmonics above! Broad-band matching transformer at feed point lets the entire HF spectrum be yours! SWR is so low you may never need a tuner.
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.
The general Instruction Manual for EFHW antennas is available at the following link for download in PDF format. I suspect my EFHW transformer is faulty. What to do? We receive hundreds of messages every year claiming that something is wrong with our EFHW transformers.
