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Ramsey Electronics DA-40 manual

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Table of contents for the manual

  • Page 1

    RAMSEY DA SERIES DIPOLE ANTENNA Page 1 Ramsey Electronics DA-40 • User tested, pr oven antenna tec hnology to br ing you the b est value. • Clear, concise in structions are just what y ou won ’t find with other antennas. Our manual te aches you eve r yt hing that you need to know, and even points y ou in the righ t direct ion if you w ant to [...]

  • Page 2

    Page 2 RAMSEY DA SERIES DIPOLE ANTENNA P ARTIAL LIST OF AV AILABLE KI TS RA M SEY T RA NSM ITT E R KI TS • FM-10 FM Stereo Transm itter • FM-1,2,4 FM Wireless Mi crophones • PB-1 Telep hone Transmitter • AM-1 A M Transmitter RAMSE Y RECEI VER KITS • FR -1 FM Broa dc ast Re ce i ver • AR-1 A ircraft Band R ecei ver • SR-1 Shor twave Re[...]

  • Page 3

    RAMSEY DA SERIES DIPOLE ANTENNA Page 3 DIPOLE ANTENNA KIT Ramsey Publication No. DA Manual Price Only: $5.00 TABLE OF CONTENTS Introduction ............... .............. ................. ........... 4 Antenna De scription ................ ............. ............... 4 How Does a Dipole Antenna W ork? ............... .... 6 Schematic Diagram ...[...]

  • Page 4

    Page 4 RAMSEY DA SERIES DIPOLE ANTENNA INTR OD UC TIO N Welcome to your new dipole antenna. Dipole antennas are an extremely popular form of antenna today, beca use they satisfy the demands of almost any application! Th ere are no t many anten na desi gns that ar e so low cost, simple and “invisible”. Y ou may not know that they a re also excep[...]

  • Page 5

    RAMSEY DA SERIES DIPOLE ANTENNA Page 5 HOW DOES A DIPOLE ANTENNA WORK? A dipole antenna is a lo ng wire that is suspen ded between t wo points . The wire is cut to a specific length, and is fed in the middle w i th a radio frequency (RF) signal. One half o f the antenna is ho oked to the ground wire of the transmission line, and the other is hooked[...]

  • Page 6

    Page 6 RAMSEY DA SERIES DIPOLE ANTENNA PA RTS L IST  3 End Insulators  Length of Coaxial Feedline Cable  Length of Rope  1 PL-259 Conne ctor  1 UG-175/U Reducer  Length of Antenna W ire  2 W ire Cable Ties REQUIRED, NOT SUPPLIED  Some Good Friends (Suck ers)  Soldering Iron Gun with Rosin Core Solde r  Waterproof Seala[...]

  • Page 7

    RAMSEY DA SERIES DIPOLE ANTENNA Page 7[...]

  • Page 8

    Page 8 RAMSEY DA SERIES DIPOLE ANTENNA length, we have included a bit more w ire than you should need to build either antenna. This allows you to decide which antenna will serve y ou better. CONSTR UCTION NOT E S Just a few notes before you begin constructing your antenna. • Be careful when construc ting your antenna! Throwing rocks through windo[...]

  • Page 9

    RAMSEY DA SERIES DIPOLE ANTENNA Page 9 Total length or an Inverted V = 445/ frequency (in MHz) (in feet) Your Frequency_ ________ 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 [...]

  • Page 10

    Page 10 RAMSEY DA SERIES DIPOLE ANTENNA For example, to make a dipole antenna on 1 4.050 MHz, divide 468 by 14.05. The total dipole length be 33.31 feet or approximately 33 ‘4”. Don’t forge t that you need to insert a feed line in the center, so it m ust be cut into two pieces that are one half the length (16 feet, eight inches). Wire Length [...]

  • Page 11

    RAMSEY DA SERIES DIPOLE ANTENNA Page 11 ASSEMBLING THE A NTENN A 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 w ill reac h, 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 yo[...]

  • Page 12

    Page 12 RAMSEY DA SERIES DIPOLE ANTENNA Taking the end of one of the wire s, pass it through the hole in the insulator until six inches are through. Next, bend t he wire b ack on itself and immediately beg in to wrap it very snugly and neatly around itse lf. Ideally, you should have about six or seven turns. Using y our soldering iron, heat up the [...]

  • Page 13

    RAMSEY DA SERIES DIPOLE ANTENNA Page 13 wire. You should make sure th at the center conductor fits through the hole in the center pin, and there are no stray stran ds being f olded backw ards. This will have the unfortunate tendenc y of shorting out y our antenna. The connector should cover the bra ided wire and trap it against th e reducer. Snug i[...]

  • Page 14

    Page 14 RAMSEY DA SERIES DIPOLE ANTENNA stranded lead about o ne i nch long. Nex t, 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 aro und and fold back on itself, overlapping about one inch. [...]

  • Page 15

    RAMSEY DA SERIES DIPOLE ANTENNA Page 15 TUNING YOUR ANTENNA Hook up your radio to an S W R meter and the antenn a. Set it for a portion of the band that you think you will be using most often. Since all of our antenna leng th calculat ions are for th e center of the band, th e antenna should be slightly longer if you wish to work below this frequen[...]

  • Page 16

    Page 16 RAMSEY DA SERIES DIPOLE ANTENNA DA DIPOLE AN TENNA Quick Referenc e Page Guide Introduction ................... ................. .............. ....... 4 Antenna Description ............ .............. ................. 4 How Does a D ipole Antenna Work? ............ ....... 6 Schema tic Diagram ....................... .............. .....[...]