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Below is a list of lengths that you may use to create a UHF CB beam.
| DL6WU
Yagi |
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| Frequency
(MHz). |
|
476.9 |
MHz |
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| Wavelength
(cm). |
|
62.9 |
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| Boom
Diameter (cm). |
2.5 |
0.039742 |
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| Element
Diameter (mm). |
10 |
0.015897 |
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| Element
Thru Boom ("Y/N") |
y |
1.56725 |
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| Boom
Length (Metres) |
6 |
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| Gain
(dBd) |
|
16.7 |
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| Thru
Boom Correction (cm). |
1.57 |
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| Intermediate
Calculations |
0.51793 |
-0.18301 |
0.085819 |
0.07955 |
0.414474 |
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Elements |
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| Reflector
Length (cm). |
29.7 |
|
|
Degrees |
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| Reflector
Spacing (cm). |
15.1 |
|
Usable Bandwidth |
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| Driven
Element (cm). |
28.9 |
|
467.4 |
to |
486.4 |
Mhz. |
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Approx |
|
Horizontal - |
Actual |
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| Director Number |
Length |
Spacing |
Boom |
Gain |
Beam |
Stacking Dist |
Gain of |
Distance each |
| Number |
cms. |
cms. |
Length(cm) |
Dbd |
Width |
cms. |
Feet |
Four |
side of boom |
| _ |
|
|
0 |
0 |
|
|
|
|
|
|
| 1 |
27.6 |
4.7 |
19.8 |
5.3 |
79.1 |
49.3 |
1.6 |
10.8 |
12.6 |
|
| 2 |
27.3 |
11.3 |
31.1 |
6.8 |
66.3 |
57.4 |
1.9 |
12.4 |
12.4 |
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| 3 |
26.9 |
13.5 |
44.7 |
8.0 |
57.6 |
65.2 |
2.1 |
13.6 |
12.2 |
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| 4 |
26.6 |
15.7 |
60.4 |
9.1 |
51.2 |
72.6 |
2.4 |
14.6 |
12.1 |
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| 5 |
26.3 |
17.6 |
78.0 |
9.9 |
46.4 |
79.8 |
2.6 |
15.4 |
11.9 |
|
| 6 |
26.1 |
18.9 |
96.9 |
10.7 |
42.6 |
86.4 |
2.8 |
16.2 |
11.8 |
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| 7 |
25.8 |
19.8 |
116.7 |
11.3 |
39.6 |
92.7 |
3.0 |
16.8 |
11.7 |
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| 8 |
25.6 |
20.8 |
137.5 |
11.8 |
37.2 |
98.5 |
3.2 |
17.3 |
11.5 |
|
| 9 |
25.4 |
21.7 |
159.2 |
12.3 |
35.1 |
104.1 |
3.4 |
17.8 |
11.4 |
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| 10 |
25.2 |
22.6 |
181.8 |
12.8 |
33.3 |
109.5 |
3.6 |
18.2 |
11.3 |
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| 11 |
25.0 |
23.6 |
205.4 |
13.2 |
31.8 |
114.7 |
3.8 |
18.7 |
11.2 |
|
| 12 |
24.8 |
24.2 |
229.6 |
13.6 |
30.4 |
119.7 |
3.9 |
19.0 |
11.2 |
|
| 13 |
24.6 |
24.5 |
254.1 |
13.9 |
29.2 |
124.4 |
4.1 |
19.3 |
11.1 |
|
| 14 |
24.5 |
24.8 |
279.0 |
14.2 |
28.2 |
128.9 |
4.2 |
19.7 |
11.0 |
|
| 15 |
24.4 |
25.2 |
304.2 |
14.5 |
27.3 |
133.2 |
4.4 |
19.9 |
10.9 |
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| 16 |
24.2 |
25.2 |
329.3 |
14.8 |
26.4 |
137.3 |
4.5 |
20.2 |
10.9 |
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| 17 |
24.1 |
25.2 |
354.5 |
15.1 |
25.7 |
141.3 |
4.6 |
20.4 |
10.8 |
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| 18 |
24.0 |
25.2 |
379.6 |
15.3 |
25.0 |
145.0 |
4.8 |
20.6 |
10.8 |
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| 19 |
23.9 |
25.2 |
404.8 |
15.5 |
24.4 |
148.6 |
4.9 |
20.9 |
10.7 |
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| 20 |
23.8 |
25.2 |
430.0 |
15.7 |
23.8 |
152.1 |
5.0 |
21.0 |
10.7 |
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| 21 |
23.7 |
25.2 |
455.1 |
15.9 |
23.3 |
155.5 |
5.1 |
21.2 |
10.6 |
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| 22 |
23.7 |
25.2 |
480.3 |
16.1 |
22.8 |
158.7 |
5.2 |
21.4 |
10.6 |
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| 23 |
23.6 |
25.2 |
505.5 |
16.3 |
22.4 |
161.9 |
5.3 |
21.6 |
10.5 |
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| 24 |
23.5 |
25.2 |
530.6 |
16.4 |
21.9 |
165.0 |
5.4 |
21.7 |
10.5 |
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| 25 |
23.4 |
25.2 |
555.8 |
16.6 |
21.6 |
167.9 |
5.5 |
21.9 |
10.5 |
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| 26 |
23.4 |
25.2 |
580.9 |
16.7 |
21.2 |
170.8 |
5.6 |
22.0 |
10.4 |
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| 27 |
23.3 |
25.2 |
606.1 |
16.9 |
20.8 |
173.6 |
5.7 |
22.1 |
10.4 |
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| 28 |
23.3 |
25.2 |
631.3 |
17.0 |
20.5 |
176.4 |
5.8 |
22.3 |
10.4 |
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| 29 |
23.2 |
25.2 |
656.4 |
17.1 |
20.2 |
179.1 |
5.9 |
22.4 |
10.4 |
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| 30 |
23.2 |
25.2 |
681.6 |
17.3 |
19.9 |
181.7 |
6.0 |
22.5 |
10.3 |
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| 31 |
23.2 |
25.2 |
706.8 |
17.4 |
19.6 |
184.2 |
6.0 |
22.6 |
10.3 |
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| 32 |
23.1 |
25.2 |
731.9 |
17.5 |
19.4 |
186.7 |
6.1 |
22.7 |
10.3 |
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| 33 |
23.1 |
25.2 |
757.1 |
17.6 |
19.1 |
189.2 |
6.2 |
22.8 |
10.3 |
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| 34 |
23.0 |
25.2 |
782.2 |
17.7 |
18.9 |
191.6 |
6.3 |
22.9 |
10.3 |
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| 35 |
23.0 |
25.2 |
807.4 |
17.8 |
18.6 |
194.0 |
6.4 |
23.0 |
10.3 |
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| 36 |
23.0 |
25.2 |
832.6 |
17.9 |
18.4 |
196.3 |
6.4 |
23.1 |
10.2 |
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| 37 |
23.0 |
25.2 |
857.7 |
18.1 |
18.2 |
198.5 |
6.5 |
23.2 |
10.2 |
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| 38 |
22.9 |
25.2 |
882.9 |
18.1 |
18.0 |
200.8 |
6.6 |
23.3 |
10.2 |
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| 39 |
22.9 |
25.2 |
908.1 |
18.2 |
17.8 |
203.0 |
6.7 |
23.4 |
10.2 |
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| 40 |
22.9 |
25.2 |
933.2 |
18.3 |
17.6 |
205.1 |
6.7 |
23.4 |
10.2 |
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| 41 |
22.9 |
25.2 |
958.4 |
18.4 |
17.4 |
207.3 |
6.8 |
23.5 |
10.2 |
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| 42 |
22.9 |
25.2 |
983.5 |
18.5 |
17.3 |
209.3 |
6.9 |
23.6 |
10.2 |
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| 43 |
22.8 |
25.2 |
1008.7 |
18.6 |
17.1 |
211.4 |
6.9 |
23.7 |
10.2 |
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| 44 |
22.8 |
25.2 |
1033.9 |
18.7 |
16.9 |
213.4 |
7.0 |
23.8 |
10.2 |
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| 45 |
22.8 |
25.2 |
1059.0 |
18.8 |
16.8 |
215.4 |
7.1 |
23.8 |
10.2 |
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| 46 |
22.8 |
25.2 |
1084.2 |
18.8 |
16.6 |
217.4 |
7.1 |
23.9 |
10.2 |
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| 47 |
22.8 |
25.2 |
1109.4 |
18.9 |
16.5 |
219.3 |
7.2 |
24.0 |
10.1 |
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| 48 |
22.8 |
25.2 |
1134.5 |
19.0 |
16.3 |
221.2 |
7.3 |
24.0 |
10.1 |
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| 49 |
22.8 |
25.2 |
1159.7 |
19.1 |
16.2 |
223.1 |
7.3 |
24.1 |
10.1 |
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| 50 |
22.8 |
25.2 |
1184.8 |
19.1 |
16.0 |
225.0 |
7.4 |
24.1 |
10.1 |
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