BUDDIPOLE IN THE FIELD

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6 Ground Mounted Verticals As discussed earlier, ground mounted horizontal dipoles on Buddipole masts and tripods cannot be raised to a sufficient height to achieve a reasonable radiation pattern for most HF bands. Only 10m dipoles when raised to a ½ wavelength in height (5 meters or about 16 feet) deliver the power to low angles that give us good DX opportunities. So, if horizontal dipoles are out, what simple deployment designs remain? Two options come to mind immediately: vertical dipoles and vertical monopoles with elevated radials. We’ll examine each in turn. Vertical dipoles are just as they sound: a dipole antenna deployed such that the elements are Ground mounted vertical antenna for 17m on VP2M perpendicular to the ground instead of parallel to it. The two general problems deploying such antennas are managing its height (a full-sized 20m vertical dipole will be ½ wavelength high or 33 feet!), and to get the feed line to the feedpoint. A dipole is typically constructed such that both elements lie straight on an imaginary line. In the case of a vertical dipole, both elements would be perpendicular to the ground, one element directly above the other. What about an antenna where the bottom element is not quite perpendicular? What about one where the bottom element is at a 45 degree angle to the ground? The collection of far field plots in Figure 20 show how the radiation pattern of a 10m antenna with its feedpoint at 15 feet changes as the lower element is rotated from directly under the top element (at 180 degrees from that top element) to perpendicular to it (at 90 degrees from that top element). 61
180 degrees Vertical dipole 170 degrees 160 degrees 150 degrees 140 degrees 130 degrees 120 degrees 110 degrees 100 degrees 90 degrees Figure 20 Far field pattern of a 10m antenna rotating the bottom element Consider the antenna configuration when the lower element is extended at 150 degrees below the vertical. That is, there is a 150 degree angle between the elements. Dropping the single whip or wire at this angle makes setup easy, but is the antenna effective? 62
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BUDDIPOLE IN THE FIELD by B. Scott
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Buddipole in the Field Published b
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Foreword Back in early 2000 a self-
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Preface When the term ham radio sta
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Acknowledgements The danger of one
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How to use this book Though the Bud
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Table of Contents 1 THE BUDDIPOLE
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all—though this book will cover m
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7 Buddipole on the Beach Beaches bo
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A note to Buddistick users The Budd
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The VersaTee is the heart of the Bu
Page 25 and 26: All these pieces come together to c
Page 27 and 28: proper turn of the wire, orient the
Page 29 and 30: All of the discussions above are fo
Page 31 and 32: The Mast Guying Kit consists of thr
Page 33 and 34: picnic table with a clamp securing
Page 35 and 36: Extra coil clips are strong and bri
Page 37 and 38: If using the 16 foot mast, insert t
Page 39 and 40: expects to see a 50 ohm load to an
Page 41 and 42: Power ratio dB Power ratio dB 1.25:
Page 43 and 44: Consider an antenna that is 1% effi
Page 45 and 46: An alternative is to use precise ma
Page 47 and 48: factors. How will such compromises
Page 49 and 50: directions we care about. That is,
Page 51 and 52: details, including the important co
Page 53 and 54: Figure 13 Elevation plot for a Budd
Page 56 and 57: 5 Balconies and Rooftops The Buddip
Page 58 and 59: BASIC DIPOLE TUNING WITH 9.5 FOOT W
Page 60 and 61: shows (from left to right) a whip,
Page 62 and 63: 10m elevation plot at 16 feet 10m e
Page 74: Other configurations for this anten
Page 79 and 80: Antenna deployment Far field elevat
Page 81 and 82: the dipole. However, as soon as we
Page 83 and 84: 17m vertical with 2 radials Far fie
Page 85 and 86: Perfect ground Saltwater Figure 28
Page 87 and 88: The table above may not be the fina
Page 89 and 90: Buddipole configurations cannot eas
Page 91 and 92: impedance values are complex number
Page 93 and 94: Buddipole Ground Mounted Verticals
Page 95 and 96: terminated with a ring connector, a
Page 97 and 98: The downward sloping wire radials r
Page 99 and 100: Standard Buddipole with coil Option
Page 101 and 102: The antenna is short for a 15m ante
Page 103 and 104: Standard Buddipole Long whip Vertic
Page 105 and 106: SWR plot for shortened vertical Far
Page 107 and 108: Just replacing the 5.5' whip with t
Page 109 and 110: 40m vertical A 40m vertical antenna
Page 111 and 112: Standard Buddipole 4x arms 9.5' whi
Page 113 and 114: An elevated vertical monopole with
Page 115 and 116: 12m Far field plot for 12m antenna
Page 117 and 118: 30m Far field plot for 30m antenna
Page 119 and 120: 104 Clamp Mounting plate Typical de
Page 121 and 122: Buddistick Cookbook All Buddistick
Page 123 and 124: 12m Buddistick The Buddistick shoul
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17m Buddistick The Buddistick shoul
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20m Buddistick SWR 20m Buddistick f
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Figure 51 Buddipole 6m two element
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Figure 54 SWR plot for Buddipole 6m
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The whips connected to the VersaTee
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2m three element Yagi A 3 element Y
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10m 2 element Yagi The 10m two elem
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12m 2 element Yagi The 12m Yagi is
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126
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Table 11 shows configuration option
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SWR for 80m antenna with 16 radials
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Antenna setup from Buddipole Low Ba
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system and the 2 radial system is i
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60m The 60m band consists of five c
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SWR plot for 60m vertical Far field
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140
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focus on what was important, and wh
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144
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Appendix B Buddipole Low Band Coil
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Appendix D NCDXF beacon transmit ti
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BNC BUG CC CWA dB Connector type Li
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References ARRL. More Wire Antenna
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In passing Many books and articles
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BUDDIPOLE IN THE FIELD

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