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The impedance of a end fed wire can be anywhere from a few 10s of Ohms to a few thousand Ohms, depending on the frequency in use and the length of the wire. Other factors that can affect the impedance are bends in the wire, height above ground, proximity to buildings and wire diameter.
2.1. Antenna length based on the following formulars: 1/2 λ dipole (feet)= 468 / frequency in Mhz. 1/2 λ dipole (meters) = 142.65 / frequency in Mhz. Full wave loop (feet) = 1005 / frequency in Mhz. Full wave loop (meters) = 306.32 / frequency in Mhz. Cut wire slightly longer for connecting insulators and pruning. 22-Jun-2007 09:30 AM.
19 sty 2017 · I want to use an end-fed wire antenna, but what would be the best length of wire for the 20m and 40m bands? Is there a way to work this out? This is assuming a tuner will be used.
This calculator is an aid for determining antenna element lengths, based on Frequency, Type (Wire or Tubing), and Diameter (AWG#, inches, mm) of the element. At the top of the calculator, enter the Frequency (1 to 30 MHz) of interest.
CHARTS OF FEEDLINE LENGTHS: This page contains tables showing usable feedling lengths (L F) for 3 different sizes (L D) of antennas. It also shows lengths for generic 600 Ohm line and 450 [400] Ohm Wirmean line. IMPORTANT: ANTENNA MATCHBOX SPECIFICATIONS:
Radiation pattern of EFHW antenna is the same as radiation pattern of the Center fed Dipole antenna. That is true only at its first resonance where antenna is half wavelength long just as Simple Dipole antenna. Unlike center fed Dipole, the EFHW antenna can be used on both odd and even multiples or harmonics.
This article will focus mainly on the antenna we built at Alan Parks, N7SHA, QTH. But the techniques used are applicable to any antenna installation. However we will focus on the specific of an end fed wire which apply to all end fed wires regardless of length.
