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Scanner Antenna Users Guide

Austin Antenna Logo

  by Austin Antenna

  The Leader in Multiband Technology

 Electromagnetic Field:

An antenna, whether it is being used for transmission or reception, by its size has an associated electromagnetic field. If the antenna is r resonant and is positioned vertically, i.e., vertically polarized, the associated electromagnetic field or sometimes called "radiation pattern" if we could see it, would have a shape similar to a doughnut. If you were standing above the top end of the antenna looking down you would see the top view of the doughnut, Fig. 1. If you cut the doughnut in half, into two "U" shaped pieces and looked into the cut off cross section you would see a typical pattern shape of a vertical antenna. Fig. 2. Fig. 3 is a simplified drawing of the doughnut cross section. Notice that the pattern shown is centered on the horizontal line. This is where !t should be if you are trying to get the best antenna performance at the greatest distance from your location. If an antenna is poorly designed, more often than not the pattern will be tilted up or down from the horizontal axis as shown in Fig. 4. and performance is severely degraded. The positioning of the pattern is one of the most important characteristics of a properly designed antenna and is often referred to as the "radiation angle".

Austin Antenna's Multiband Scanner Antenna User's Guide Fig.1 Diagram
Fig. 1

Austin Antenna's Multiband Scanner Antenna User's Guide Fig.2 Diagram
Fig. 2

Check out Austin Antenna's   Ferret Base    Spectra Mobile   Condor Portable


Impedance, for our purposes, is a numerical expression in ohms of the electrical characteristics of the antenna's point of attachment to the scanner/receiver. This number most often associated with scanner/receiver applications is from 50 to 70 ohms. This same expression is also used to characterize the feed line [usually coaxial cable] connecting the antenna to the scanner/receiver. In the case of the feed line, its impedance is fairly constant with frequency change. The scanner/receiver input connection is also engineered to a fairly constant impedance. The antenna on the other hand is not! This characteristic is one of the main challenges to the antenna designer. It is also this characteristic that is or should be one of the most significant concerns of the purchaser of antenna products for scanner/receiver requirements. The associated buzz word for performance related to the impedance characteristic is "bandwidth". When you get home with your Super Atomic, Jet Propelled, Screaming Mimi that you just paid $4.75 for, off the get rid of it quick table down at your nearest Electronic Emporium, there is nothing that you can dip it in or rub on it to make it do the real job when you hook it to your new $500 Megga Mystron Golden Warrior scanner/receiver. "You have had it Jack! " It probably won't take you very long to find it out all by yourself!
                         Right! You bought a "WICK".

Austin Antenna's Multiband Scanner Antenna User's Guide Fig.3 Diagram
Fig. 3

Austin Antenna's Multiband Scanner Antenna User's Guide Fig.4 Diagram
Fig. 4

Check out Austin Antenna's   Ferret Base    Spectra Mobile   Condor Portable

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