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antenna is based on any number of parameters: specifically, the frequency or band of frequencies, location, directivity, and intended power range. This paper discusses some of the more important aspects of the End Fed Half Wave (EFHW) dipole antenna. The frequency band is HF (40 meters), and the intended power is 100 watts.
In this article I will cover several topics given that the subject is about building an Antenna System and not just the antenna. There are four specific areas we will dive into, the first is the antenna, the second baluns, the third chokes, and lastly the transmission line.
If you attended Field Day 2022, you may have been one of the students that learned how to build an end fed half wave Antenna and actually got to build one and take it home. For those that were not able to do so, this page is for you.
The Single Wire End Fed Antenna is probably the simplest antenna to use. But when you start looking around, you find that no one can agree on what length to use. Some say any length will work, some stress odd multiples of 1/4 wavelength, while others lean toward even multiples of 1/2 wavelengths.
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.
This white paper (somewhat technical) reviews various wire antenna configurations Base Fed L, Center Fed L, Center Fed Sloping Doublet, Base Fed Sloping Wire, and various Inverted L configurations.
Decide on one of following wire configurations bearing in mind to have the antenna wire as high as possible and far as possible from anything and everything. Straight Horizontal wire configuration.
