K8CU
Technical Topics
K8CU
K8CU  
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10-30 MHz Log Periodic Metric element construction

 

Element spacing on boom, mm

0

Element resonance

10.33 MHZ

156 kmh wind speed

Half element tubing sizes, mm

50 mm x 2mm x 914.4 mm
45 mm x 2mm x 812.8 mm
40 mm x 1.5 mm x 812.8 mm
35 mm x 2 mm x 812.8 mm
30 mm x 2 mm x 812.8 mm
25 mm x 2 mm x 812.8 mm
20 mm x 1.5 mm x 812.8 mm
16 mm x 1.5 mm x 1549.4 mm

2286 mm

10.48 MHz

159 kmh wind speed

50 mm x 2mm x 914.4 mm
45 mm x 2mm x 812.8 mm
40 mm x 1.5 mm x 812.8 mm
35 mm x 2 mm x 812.8 mm
30 mm x 2 mm x 812.8 mm
25 mm x 2 mm x 812.8 mm
20 mm x 1.5 mm x 812.8 mm
16 mm x 1.5 mm x 1435.1 mm
3403.6 mm
(3657.6 mm for 14-30 MHz version only)

11.69 MHz

120 kmh wind speed

25 mm x 4 mm x 1828.8 mm
20 mm x 1.5 mm x 1727.2 mm
16 mm x 1.5 mm x 1727.2 mm
12 mm x 1.5 mm x 1066.8 mm
4902.2 mm

14 MHz

120 kmh wind speed

25 mm x 2 mm x 1828.8 mm
20 mm x 1.5 mm x 1727.2 mm
16 mm x 1.5 mm x 1701.8 mm
6070.6 mm

15.05 MHz

129 kmh wind speed

25 mm x 2 mm x 1828.8 mm
20 mm x 1.5 mm x 1727.2 mm
16 mm x 1.5 mm x 1320.8 mm
7162.8 mm

16.35 MHz

138 kmh wind speed

25 mm x 2 mm x 1828.8 mm
20 mm x 1.5 mm x 1727.2 mm
16 mm x 1.5 mm x 927.1mm
8077.2 mm

18.7 MHz

154 kmh wind speed

25 mm x 2 mm x 1828.8 mm
20 mm x 1.5 mm x 1727.2 mm
16 mm x 1.5 mm x 342.9 mm
9017 mm

20.3 MHz

166 kmh wind speed

25 mm x 2 mm x 1828.8 mm
20 mm x 1.5 mm x 1752.6 mm

9804.4 mm

22.0 MHz

179 kmh wind speed

25 mm x 2 mm x 1828.8 mm
20 mm x 1.5 mm x 1473.2 mm
10591.8 mm

23.85 MHz

191 kmh wind speed

25 mm x 2 mm x 1828.8 mm
20 mm x 1.5 mm x 1212.85 mm
11404.6 mm

25.15 MHz

201 kmh wind speed

25 mm x 2 mm x 1828.8 mm
20 mm x 1.5 mm x 1054.1 mm
12192 mm

28 MHz

224 kmh wind speed

25 mm x 2 mm x 1828.8 mm
20 mm x 1.5 mm x 749.3 mm
13004.8 mm

30.85 MHz

243 kmh wind speed

25 mm x 2 mm x 1828.8 mm
20 mm x 1.5 mm x 508 mm
13792.2 mm

34.0 MHz

265 kmh wind speed

25 mm x 2 mm x 1828.8 mm
20 mm x 1.5 mm x 279.4 mm
14605 mm

37.5 MHz

290 kmh wind speed

25 mm x 2 mm x 1828.8 mm
20 mm x 1.5 mm x 69.85 mm

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