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RAMSEY DA SERIES  DIPOLE ANTENNA

 

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.  The braided shield should be 
caught between the reducer and connector and be held in very tightly. 
 
   Before you solder, it is a good idea to use an ohmmeter to check to see if 
your center pin may be shorted to the outer braid.  To do this, simply place 
the ohmmeter across the two pins.  Infinite ohms and you’re in the clear!  
Using your soldering gun, solder the center conductor onto the pin, and trim 
off any extra.  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 easily.  Next, 
solder into each of the holes on the side of the connector.  You should be 
able to see the braided wire through at least some of the holes.  Once more, 
check with your ohmmeter to see if there is a short.  Please note that it is not 
recommended that you leave the connector unsoldered.  Moisture will 
quickly cause all of your connections inside to go bad. 
 
   Screw the large outer ring onto the PL-259 connector.  (Now you see the 
importance of placing it onto the wire with the threads out!)  Your connector 
is now finished.  Next, we will talk about connecting the wire to the center 
connector. 
 
   Begin by stripping the outer insulation off of the coaxial cable like you have 
done before.  Bend the braid back, and twist it together to form a thick 

Summary of Contents for DA-80

Page 1: ...ormance 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...

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: ...Only 5 00 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 9 Construction Notes 10 Ante...

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: ...otal 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: ...ping 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...

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: ...n and trim off any extra 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 t...

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: ...s 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 Reading 15 Manual only p...

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