![]() ![]() The dipole undergoes only one transition in charge and in current Result, the current is maximum at the center and minimum at the wireĮnds. Minimum at the center feedpoint and maximum at the element ends. Is electrically ½ wavelength, which for any real wire or tubularĮlement turns out to be shorter than a physical half wavelength.įinally, it is a dipole because, as Fig. Is (almost) purely resistive, with little or no reactance. It is resonant since the feedpoint impedance Original Windom had only a single feed wire).ĭipole that we sometimes set up for single-band use is a more complexĪntenna than its appearance suggests. In this context, we also tend to call any end-fedĪntenna a Zepp (although there is a center-fed extended double Zepp)Īnd to refer to any off-center-fed antenna as a Windom (although the Looks like a dipole, that is, a center-fed wire antenna with a feedline This interesting question has 2 answers: none and a lot.Ĭonversationally, the term "dipole" often refers to any antenna that What's the difference between a doublet and a dipole? However, there are limits that we shall explore as we proceed throughĢ. ![]() ![]() Into service on 80 meters, and the 67' wire might be used on 60 meters. The 100' wire, while somewhat shorter than ½ wavelength, can be pressed It also shows the ham bands covered by the antenna. Shows common doublet lengths that have appeared in handbooks since theġ930s. The antenna wire itself can have many lengths, but should be about ½ wavelength at the lowest operating frequency. Impedance at the tuner terminals to the standard 50-Ohm input and Tuner because the impedance that shows up at its terminals will vary Tuner (or antenna-tuning unit, the ATU) or vice versa. Transmission line transfers the energy from the antenna to the antenna Transmitted energy and the reception of incoming energy. The horizontal center-fed wireįorms the antenna proper, which accounts for the radiation of What is an all-band doublet? The all-band doublet is actually an antenna system and not just an antenna alone. Tackling these frequently asked questions is to help newer hams erect aġ. Them down to 10, all of which have many variations. I have collected the questions and boiled Despite all the wordsĪnd diagrams in handbooks over the years, newcomers still send me The all-band doublet horizontal wire antenna hasĪ history almost as long as amateur radio itself. 10 Frequency Asked Questions about the All-Band Doublet L. ![]()
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