BUDDIPOLE IN THE FIELD

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so long as the components are correctly sized, configured, and positioned. Figure 9 Model view of a Buddipole for 10m at 8 feet The resulting SWR plot shows this antenna to be a nice match for a 50 ohm transceiver. Figure 10 SWR plot for a Buddipole for 10m at 8 feet The SWR is well below 2:1 for the frequency range 28.0 to 29.0 MHz. This would leave a feedpoint impedance of roughly 54 ohms. More 35
details, including the important comparison to the isotropic radiator, can be found in the elevation plot in Figure 11. Figure 11 Elevation plot for a Buddipole on 10m at 8 feet The outer ring on this plot is 5.88 dBi. But, this plot looks significantly different than the one for the 80m dipole at 130 feet. Most of the radiation is directed up towards the zenith. Power levels below 45 degrees from the horizon taper off quickly. At 20 degrees (approximately) the power is 5 dB below the peak. At 15 degrees power is 10 dB below the peak. At 10 degrees we are 15 to 20 dB below the peak. Near Vertical Incident Skywave (NVIS) antennas do intentionally radiate towards the zenith. They are popular antennas for HF close-in communication. But, they use the 80m and 40m bands for this activity, not 20m or above, as the ionosphere does not reflect higher frequency signals well at high angles. The Buddipole makes an excellent NVIS antenna on those lower bands. Consider the area of the plot 15 to 20 degrees either side of the zenith as illustrated in Figure 12. This area is highlighted as a shaded triangle. 36
Page 1 and 2: BUDDIPOLE IN THE FIELD by B. Scott
Page 3 and 4: Buddipole in the Field Published b
Page 6 and 7: Foreword Back in early 2000 a self-
Page 8 and 9: Preface When the term ham radio sta
Page 10 and 11: Acknowledgements The danger of one
Page 12 and 13: How to use this book Though the Bud
Page 14: Table of Contents 1 THE BUDDIPOLE
Page 17 and 18: all—though this book will cover m
Page 19 and 20: 7 Buddipole on the Beach Beaches bo
Page 21 and 22: A note to Buddistick users The Budd
Page 23 and 24: 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: directions we care about. That is,
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 77 and 78: 180 degrees Vertical dipole 170 deg
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
Page 125 and 126:
17m Buddistick The Buddistick shoul
Page 127 and 128:
20m Buddistick SWR 20m Buddistick f
Page 129 and 130:
Figure 51 Buddipole 6m two element
Page 131 and 132:
Figure 54 SWR plot for Buddipole 6m
Page 133 and 134:
The whips connected to the VersaTee
Page 135 and 136:
2m three element Yagi A 3 element Y
Page 137 and 138:
10m 2 element Yagi The 10m two elem
Page 139 and 140:
12m 2 element Yagi The 12m Yagi is
Page 141 and 142:
126
Page 143 and 144:
Table 11 shows configuration option
Page 145 and 146:
SWR for 80m antenna with 16 radials
Page 147 and 148:
Antenna setup from Buddipole Low Ba
Page 149 and 150:
system and the 2 radial system is i
Page 151 and 152:
60m The 60m band consists of five c
Page 153 and 154:
SWR plot for 60m vertical Far field
Page 155 and 156:
140
Page 157 and 158:
focus on what was important, and wh
Page 159 and 160:
144
Page 161 and 162:
Appendix B Buddipole Low Band Coil
Page 163 and 164:
Appendix D NCDXF beacon transmit ti
Page 165 and 166:
BNC BUG CC CWA dB Connector type Li
Page 167 and 168:
References ARRL. More Wire Antenna
Page 169 and 170:
In passing Many books and articles
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BUDDIPOLE IN THE FIELD

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