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Ramsey Electronics
Looking for an easy to build, solid performing antenna? The
dipole is hard to beat! These inexpensive, high quality
antennas are the time tested solution to price, relative
invisibility, and most of all, performance.
•
User tested, proven antenna technology to bring you the best
value.
•
Clear, concise instructions are just what you won't find with other
antennas. Our manual teaches you everything that you need to
know, and even points you in the right direction if you want to learn
more!
•
Can be set up as a typical dipole antenna, or the popular "Inverted
V" configuration, for less space and excellent performance.
•
Build a home brew antenna... right down to the last soldering
connection.
•
These dipoles are virtually invisible, but do not compromise
performance, or signal capabilities.
•
Perfect as a second antenna for those whose antennas won't
handle a specific band.
•
High quality components assure you a working antenna every
time... and tuning it is so easy!
•
The right antenna at the right price.
DA-80
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Summary of Contents for Ramsey Electronics DA-80
- Page 1 Ramsey Electronics DA-80 Looking for an easy to build, solid performing antenna? The dipole is hard to beat! These inexpensive, high quality antennas are the time tested solution to price, relative invisibility, and most of all, performance. • User tested, proven antenna technology to bring you the best value.
- Page 2 1994 by Ramsey Electronics, Inc. 793 Canning Parkway, Victor, New York 14564. All rights reserved. No portion of this publication may be copied or duplicated without the written permission of Ramsey Electronics, Inc. Printed in the United States of America. RAMSEY DA SERIES DIPOLE ANTENNA...
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Page 3: Table Of Contents
Ramsey Publication No. DA Manual Price Only: $5.00 ASSEMBLY AND INSTRUCTION MANUAL FOR DIPOLE ANTENNA KIT TABLE OF CONTENTS Introduction ............4 Antenna Description ..........4 How Does a Dipole Antenna Work? ....6 Schematic Diagram ..........7 Parts List ............. 8 What Kind Of An Antenna Is Best For You? .. -
Page 4: Introduction
INTRODUCTION Welcome to your new dipole antenna. Dipole antennas are an extremely popular form of antenna today, because they satisfy the demands of almost any application! There are not many antenna designs that are so low cost, simple and “invisible”. You may not know that they are also exceptionally good radiators, beating many other antennas hands down. -
Page 5: How Does A Dipole Antenna Work
HOW DOES A DIPOLE ANTENNA WORK? A dipole antenna is a long wire that is suspended between two points. The wire is cut to a specific length, and is fed in the middle with a radio frequency (RF) signal. One half of the antenna is hooked to the ground wire of the transmission line, and the other is hooked to the center conductor. -
Page 6: Parts List
PARTS LIST End Insulators Length of Coaxial Feedline Cable Length of Rope PL-259 Connector UG-175/U Reducer Length of Antenna Wire Wire Cable Ties REQUIRED, NOT SUPPLIED Some Good Friends (Suckers) Soldering Iron Gun with Rosin Core Solder Waterproof Sealant (Silicone) and Electrical Tape Radio Transmitter Sharp Knife Wire Cutters... - Page 7 RAMSEY DA SERIES DIPOLE ANTENNA Page 7...
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Page 8: Construction Notes
length, we have included a bit more wire than you should need to build either antenna. This allows you to decide which antenna will serve you better. CONSTRUCTION NOTES Just a few notes before you begin constructing your antenna. • Be careful when constructing your antenna! Throwing rocks through windows, falling from trees, shooting a buddy during the famous bow and arrow trick and becoming electrocuted are just a few of the hazards... - Page 9 Total length or an Inverted V = 445/ frequency (in MHz) (in feet) Your Frequency_________ Calculated Length___________ Antenna Wire Length (per side) ANTENNA FREQUENCY NORMAL INVERTED BAND (KHz) DIPOLE > 1850 129’3” 122’9” ALL BAND 160m 1850 129’3” 122’9” 3750 63’9”...
- Page 10 For example, to make a dipole antenna on 14.050 MHz, divide 468 by 14.05. The total dipole length be 33.31 feet or approximately 33 ‘4”. Don’t forget that you need to insert a feedline in the center, so it must be cut into two pieces that are one half the length (16 feet, eight inches).
- Page 11 ASSEMBLING THE ANTENNA Start by finding three locations to attach your antenna. The center location must be close enough to your ham shack so that the coaxial cable will reach, but should also be as high as possible. Attaching it to a location on the roof, or to the chimney is a great place, as long as you are sure that the wires will not come into contact with trees, power lines (cringe!) or the house.
- Page 12 Taking the end of one of the wires, pass it through the hole in the insulator until six inches are through. Next, bend the wire back on itself and immediately begin to wrap it very snugly and neatly around itself. Ideally, you should have about six or seven turns.
- Page 13 wire. You should make sure that the center conductor fits through the hole in the center pin, and there are no stray strands being folded backwards. This will have the unfortunate tendency of shorting out your antenna. The connector should cover the braided wire and trap it against the reducer. Snug it down so that it is firmly on the wire.
- Page 14 stranded lead about one inch long. Next, strip the center conductor 1/4 inch closer to the end. Tin both leads. Wrap the coax wire around the center insulator making sure that it is snug in one of the two grooves. The end of the coax should loop around and fold back on itself, overlapping about one inch.
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Page 15: Tuning Your Antenna
TUNING YOUR ANTENNA Hook up your radio to an SWR meter and the antenna. Set it for a portion of the band that you think you will be using most often. Since all of our antenna length calculations are for the center of the band, the antenna should be slightly longer if you wish to work below this frequency, and slightly shorter if you work above it. - Page 16 DA DIPOLE ANTENNA Quick Reference Page Guide Introduction ............4 Antenna Description ........... 4 How Does a Dipole Antenna Work? ....6 Schematic Diagram ..........7 Parts List ............. 8 What Kind Of An Antenna Is Best For You? ..9 Construction Notes ..........