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28 lis 2023 · Winding 5/8 wavelength of wire on a 1/8 wave fiberglass rod as a reduced-length mobile antenna, and calling it a “5/8 wave antenna”. No, it is a 1/8 wave antenna. It will not act like a 5/8 wave antenna, even if you could put it over an infinite, perfectly-conducting ground plane.
A quarter wave ground plane antenna has a radiation pattern that produces maximum gain at about 25 degrees and a half wave antenna drops that angle to 20 degrees, and the 5/8 wave antenna further drops that angle to 16 degrees.
10 paź 2014 · Just a happy few build a 5/8 wave vertical antenna. This is remarkable, since the 5/8 has the lowest angle of radiation and a little bit more gain (depending on ground conditions). Whenever you have an open field to place an HF vertical, you should consider the 5/8 for DX’ing.
8 paź 2023 · For example, for the DAB+ band, the length of a 5/8 λ car antenna can be up to 1.5 meters. How to calculate a five-eighths antenna? The simplest idea is that we just need to calculate the input impedance of a 1.25 λ dipole, and half of that will be the input impedance of a 5/8 λ monopole.
A easy to build home made vertical 5/8 VHF antenna for the 2-meter band for radioamateur usage, hamradio, SWL's. Several types of 5/8 lambda antenna's made in aluminium!
25 sty 2018 · Here are the steps that I would follow in planning a 5/8 wave antenna: 1.) Model the antenna to maximize the gain and calculate the complex impedance. 2.) Engineer a matching network to convert the complex impedance of the antenna to the characteristic impedance of the coax. 3.) Construct and contrast field results with the models. Tweak as needed.
Matching a 5/8λ vertical. The 5/8λ vertical is quite popular, being ascribed some magic pattern properties. Objectively, a change in the pattern distribution occurs for a vertical monopole as its length increases past about 60% of a wavelength.
