MultecCommunications

RFWIZ.com

             Two-Way Radio Communications and Electronics Specialists


Navigation


 VERTEX
   STANDARD

 Vertex Standard Portable Two-Way Radio Selector Page Portables
 Vertex Standard Mobile Two-Way Radio Selector Page Mobiles
 Vertex Standard Repeater Selector Page Repeaters
 Vertex Standard System 600 and VX-1210 HF SSB Radios HF SSB
 Vertex Standard Product Line Photo and Links OptionAcc
 Vertex Standard Two-Way Radio Communications Product Line Photo Vertex
 Two-Way Radio Repair Page Repair
 Yeasu/Vertex Standard Antenna Rotators Rotators
 Vertex Standard VX-Trunk System VX-Trunk
 Vertex Standard Specials and New Products SPECIALS
 Vertex Standard Lowest Price Page LowPrice

 MIDLAND
 Midland Portable Two-Way Radio Selector Page Portables
 Midland Mobile Two-Way Radio Selector Page Mobiles
 Midland Repeater and Base Station Two-Way Radio Selector Page Base/Rptr

 MAXON
  LEGACY
 Maxon Legacy Portable Two-Way Radio Selector Page - Topaz Portables
 Maxon Legacy Mobile Two-Way Radio Selector Page - Topaz Mobiles
 Maxon Repeater Selector Page - Topaz Repeaters
 Maxon Base Station Selector Page - Topaz Bases
 Maxon Legacy Midland RF Data Link Selector Page - Topaz Data
 Radio Selection and Applications Help Page for Maxon, Legacy ProLine, TrueTalk and Midland - Topaz3 Radio Help

 ANTENNAS
 Austin Antenna Products and Information Austin
 Comtelco Two-Way Antenna Products Comtelco

 PAGERS

 SCA, Inc. Shimwa  Sceptar UHF/VHF Tone Pager  Sceptar UV
 SCA, Inc. Shimwa  ALPS VHFL Low Band Tone Pager  ALPS VHFL
 Pager Repair Page Repair

 TBA

 Police/Fire/EMS/Public Safety - Scanner Selector Uniden
 Scanner and Monitor Radio Antenna Information Antennas
 Scanner Repair Information Repair
 Scanner Frequency Selector Page - Scanner Frequencies ScanFreqs
 Scanner Frequency Links Page Links

 TBA

 CB Radio Selector Page Uniden
 Ranger Communications CB & Amateur Radio Selector Page Wilson
 CB Radio Repair Page Repair
 CB Radio Tune Up / Alignment Page / Peak Tune-Up
 CB & Amateur Radio Antenna Selector Page Antennas
 CB Radio Accessories Selector Page Parts/Acc

 TBA
 Wilson Antenna Selector Page Antennas
 Wilson Antenna Replacement Parts and Accessories Parts/Acc
 Francis CB antennas Selector Page Francis

 TBA
  Infopage

  MULTEC
 Multec Communications / www.rfwiz.com - How to Order Page FAQs
 Multec Communications / www.rfwiz.com - How to Order Page Ordering
 Multec Communications / www.rfwiz.com Contact
 Multec Communications / www.rfwiz.com - Friends & Members Links Page Links
 Multec Communications / www.rfwiz.com - Table of Contents Contents
 Multec Communications / www.rfwiz.com - Search Page SEARCH
 Multec Communications / www.rfwiz.com - Misc and Used Page Misc/Used
 Multec Communications / www.rfwiz.com - Terms and Conditions Returns
 Multec Communications / www.rfwiz.com - Terms and Conditions TermsCond
 

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:

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

next page     previous page


PayPal Acceptance Mark

Visa, MasterCard, Discover and American Express Accepted





Our e-commerce system uses a XRamp
SSL Secure Site protected through
www.justaddcommerce.net


Terms & Conditions
Table of Contents
Search

Copyright 2000-2018  Multec Communications / rfwiz.com - All rights reserved. Do not duplicate without the express written consent of Multec Communications.
 
Shipping & Mail only - Note: returns require a RA# - see RETURNS  before shipping
Address...                      Note: warranty repairs only - see REPAIRS  before shipping

Multec Communications
319 Centre Ave.  #166
Rockland, MA  U.S.A.   02370-2613
781 294-4992 main
781 527-5004 fax (include return email w/fax)


Main 781 294-4992
- calling hours 2-5 EST  Monday-Friday for questions and tech support only...."Out of Area", "Restricted" and "Private Caller" calls may be blocked to avoid phone spam. Note: The main line is often very busy and voice mail is not available. Please place orders online using our secure e-commerce system. Save time...order online!

If you have questions about ordering please see  ordering information page  first. Phone orders slow processing time, increase inaccuracies and are not recommended.

Email questions or comments at - Email

Note: Not responsible for typographical, photographic or pricing errors.
         All pricing and specifications subject to change without notice.