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RAMSEY  DA SERIES DIPOLE ANTENNA 

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.  Their exceptional 
qualities on low frequency bands such as 160, 80 and 40 meters is also a 
great advantage over antennas many times their price. 
 
   As you may know, living in a neighborhood with other people may 
immediately lead to problems with neighbors who are worried about the 
effect that your antenna will have on them.  Many people are worried about 
your ham gear interfering with their television sets or radios.  In addition, 
many people who simply don’t know enough about your hobby may think 
that it could attract lightning to their houses, or even fall off of your roof 
(heaven forbid!)  This is where the “invisible” properties of a dipole are so 
important.  In a short day’s work, you can install your antenna that to even 
the nosiest neighbor might be strained to see. 
 
   But the great thing is that your antenna is also a great radiator.  Is it any 
wonder why hams who spend over a thousand dollars on beam antennas for 
20, 15 and 10 meters also own dipoles to work the 160, 80 and 40 meter 
bands?  In fact, dipoles are one of the oldest, and most tested antennas in 
existence.  This is why we are proud to offer you a reliable, time tested 
antenna design at low cost. 
 

ANTENNA DESCRIPTION

 

 
   Your Ramsey antenna has been designed for practicality, performance and 
price.  Every effort has been made to offer you not only high quality parts, 
but also an affordable price that will make beginners starting in the hobby, or 
avid hams looking for a second antenna feel good.  Because we offer a 
range of antennas, each designed for a different band, you will notice that 
this book encompasses each of them.  In the tables provided, use the data 
that best resembles your particular purpose and needs.

Summary of Contents for DA-40

Page 1: ...e 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...

Page 2: ...TEUR RADIO KITS FX Series VHF and UHF Transceivers HR Series HF All Mode Receivers QRP Series HF CW Transmitters CW 7 CW Keyer PA Series VHF and UHF Power Amplifiers Packet Computer Interfaces QRP Pow...

Page 3: ...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 10 Antenna Construction 13 Tuning Your Antenna 15 Other Re...

Page 4: ...ouses or even fall off of your roof heaven forbid This is where the invisible properties of a dipole are so important In a short day s work you can install your antenna that to even the nosiest neighb...

Page 5: ...and push a pen or pencil through the center Hold it up in front of you Let s pretend that the pencil represents our antenna and the paper represents where our signal is concentrated As you can see mos...

Page 6: ...Inverted V antenna A normal dipole is just what we have been talking about An Inverted V is a variation of a normal dipole that features slanting wires for easier mounting on small properties or where...

Page 7: ...RAMSEY DA SERIES DIPOLE ANTENNA Page 7...

Page 8: ...sier especially if they know a thing or two about stringing antennas or own a bow or arrow ANTENNA CONSTRUCTION Now it s time to begin construction First make sure that you have all of your antenna pa...

Page 9: ...equency_________ Calculated Length___________ ANTENNA BAND FREQUENCY KHz NORMAL DIPOLE INVERTED V ALL BAND 1850 129 3 122 9 160m 1850 129 3 122 9 80m 3750 63 9 60 6 40m 7050 33 11 31 6 20m 14250 16 9...

Page 10: ...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 Wire...

Page 11: ...g the aluminum drain piping off of the side of your house or pulling your favorite night table out of your bedroom window by one of the legs not only earns you bad points with the spouse but it can ge...

Page 12: ...will be connected to your radio Unscrew the large outer shell from the PL 259 connector and place it onto the coaxial cable with the threaded end inside facing the end of the wire that you are working...

Page 13: ...ra Be sure that the solder flows easily into the hole and does not bead on the outside This indicates a cold solder joint more heat needed and also will not allow the connector to plug into your radio...

Page 14: ...place where you can secure it you may also suspend it using the strength of the ends to hold it in the air If you need to secure the antenna tie a length of rope to the object that you are securing i...

Page 15: ...ng the SWR of your antenna You will notice that if you tune up or down this will change Try this and note whether or not the SWR gets higher or lower as you go up in frequency If it gets higher as you...

Page 16: ...List 8 What Kind Of An Antenna Is Best For You 9 Construction Notes 10 Antenna Construction 13 Tuning Your Antenna 15 Other Reading 15 Manual only price 5 00 Ramsey Publication No MDA Assembly and In...

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