BEAM SPREAD TABLES (Imperial and Metric)
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BEAM SPREAD TABLES REF-001.TXT
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A. BEAM WIDTH - vs distance and spread angle - IMPERIAL
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DIST| ANGLE (in degrees)
in | 10 15 20 25 30 35 40 45 50 55 60
Feet|-----------------------------------------------------------------
5 | .9 1.4 1.8 2.3 2.7 3.2 3.6 4.1 4.5 5.0 5.4
10 | 1.8 2.7 3.6 4.5 5.4 6.3 7.2 8.1 9.0 9.9 10.8
15 | 2.7 4.0 5.4 6.8 8.1 9.5 10.8 12.2 13.5 14.9 16.2
20 | 3.6 5.4 7.2 9.0 10.8 12.6 14.4 16.2 18.0 19.8 21.6
25 | 4.5 6.8 9.0 11.3 13.5 15.8 18.0 20.3 22.5 24.6 27.0
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30 | 5.4 8.1 10.8 13.5 16.2 18.9 21.6 24.3 27.0 29.7 32.4
35 | 6.3 9.5 12.6 15.8 18.9 22.0 25.2 28.4 31.5 34.7 37.8
40 | 7.2 10.8 14.4 18.0 21.6 25.2 28.8 32.4 36.0 39.6 43.2
45 | 8.1 12.2 16.2 20.3 24.3 28.4 32.4 36.5 40.5 44.6 48.6
50 | 9.0 13.5 18.0 22.5 27.0 31.5 36.0 40.5 45.0 49.5 54.0
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55 | 9.9 14.6 19.8 24.8 29.7 34.7 39.6 44.6 49.5 54.5 59.4
60 | 10.8 16.2 21.6 27.0 32.4 37.8 43.2 48.6 54.0 59.4 64.8
65 | 11.7 17.6 23.4 29.3 35.1 41.0 46.8 52.7 58.5 64.4 70.2
70 | 12.6 18.9 25.2 31.5 37.8 44.1 50.4 56.7 63.0 69.3 75.6
75 | 13.5 20.3 27.0 33.8 40.5 47.3 54.0 60.8 67.6 74.3 81.0
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80 | 14.4 21.6 28.8 36.0 43.2 50.4 57.6 64.8 72.0 79.2 86.4
85 | 15.3 23.0 30.6 38.3 46.0 53.6 61.2 68.9 76.5 84.2 91.8
90 | 16.2 24.3 32.4 40.5 48.6 56.7 64.8 72.9 81.0 89.1 97.2
95 | 17.1 25.7 34.2 42.8 51.3 59.9 68.4 77.0 85.5 94.1 102.6
100 | 18.0 27.0 36.0 45.0 54.0 63.0 72.0 81.0 90.0 99.0 108.0
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B. BEAM WIDTH - vs distance and spread angle. - METRIC
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DIST| ANGLE (in degrees)
in | 10 15 20 25 30 35 40 45 50 55 60
Meters----------------------------------------------------------------
2 | .36 .54 .72 .90 1.08 1.26 1.44 1.62 1.80 1.98 2.1
4 | .72 1.08 1.44 1.80 2.16 2.52 2.88 3.24 3.60 3.96 4.3
6 | 1.08 1.62 2.16 2.79 3.24 3.78 4.32 4.86 5.40 5.94 6.4
8 | 1.44 2.16 2.88 3.60 4.32 5.04 5.76 6.48 7.20 7.92 8.6
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10 | 1.8 2.7 3.6 4.5 5.4 6.3 7.2 8.1 9.0 9.9 10.8
15 | 2.7 4.0 5.4 6.7 8.1 9.4 10.8 12.1 13.5 14.8 16.2
20 | 3.6 5.4 7.2 9.0 10.8 12.6 14.4 16.2 18.0 19.8 21.6
25 | 4.5 6.7 9.0 11.2 13.5 15.7 18.0 20.2 22.5 24.7 27.0
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30 | 5.4 8.1 10.8 13.5 16.2 18.9 21.6 24.3 27.0 -
35 | 6.3 9.5 12.6 15.7 18.9 22.0 25.2 28.3 -
40 | 7.2 10.8 14.4 18.0 21.6 25.2 28.8 -
45 | 8.1 12.2 16.2 20.2 24.3 28.3 -
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(c) 1999 by Bill Williams