There is a massive amount of antenna information out there. Start here... Put this picture in your head and make things a lot easier. Nothing has changed since the turn of the century and it is not going to either. If Tesla was here he would be telling you the exact same thing. Little bit of how stuff works.... If a 1/4 wave vertical with an electrical length equal to the physical length @ frequency were possible it would be more apt to produce a infinitely harmonic (no distortion) wave. But, due to the materials used, (molecular make up according to the periodic table ) that is not going to happen. No such thing as gain either in mobile (unless you change angle of radiation or use two, circular, center fed dp...etc bla bla bla and a different topic) verticals. All verticals are based on the performance of a stainless steel whip with a velocity factor of approximately .95 and 50 ohms at feed point. In other words, the 102 with ball mount and correct spring is the antenna that all 1/4 wave vertical antennas are compared to mathematically. This does not mean it will work best for your application. It is not how tall it might (that is another part of the algebraic equation of gain and loss) stand but the actual physical to electrical length over counterpoise. Providing that it is purely resistive (50 ohms) at the feedpoint and all the way to the tip (radial..non radial). This style of antenna only works best on the TDC of the largest metal mass. You should not have any ferrous or non ferrous materials in the near field at all and especially if they are connected to a chassis ground. These objects cause capacitance that will make your antenna appear to be electrically short (not shorted but shorter). Stick with physics (facts). Seems to be a lost school of art...Once you understand what is happening when you create electromagnetic radiation, it is much easier to understand how radio waves travel from point a to b at the fundamental level and how antennas to their job. If there are any words here that you dont understand, get a dictionary or use something like Wikipedia. Study, study, study...
Posted on: Sun, 10 Aug 2014 02:11:09 +0000
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