VK5DJ's YAGI CALCULATOR |
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Yagi design frequency = 860.00 MHz |
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Wavelength =349 mm |
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Parasitic elements contacting a square section metal boom 22.00 mm across. |
Folded dipole mounted same as directors and reflector |
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Director/reflector diam =10 mm |
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Radiator diam =10 mm |
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REFLECTOR |
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184 mm long at boom position = 30 mm (IT = 81.0 mm) |
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RADIATOR |
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Single dipole 158 mm tip to tip, spaced 70 mm from reflector at boom posn 100 mm (IT = 68.0 mm) |
Folded dipole 178 mm tip to tip, spaced 70 mm from reflector at boom posn 100 mm (IT = 78.0 mm) |
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DIRECTORS |
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Dir
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Length
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Spaced
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Boom position
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IT
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Gain
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Gain
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(no.)
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(mm)
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(mm)
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(mm)
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(mm)
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(dBd)
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(dBi)
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1 |
157 |
26 |
126 |
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67.5 |
4.8 |
6.9 |
2 |
154 |
63 |
189 |
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66 |
6.5 |
8.6 |
3 |
152 |
75 |
264 |
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65 |
7.8 |
9.9 |
4 |
150 |
87 |
351 |
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64 |
8.9 |
11 |
5 |
149 |
98 |
448 |
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63.5 |
9.8 |
11.9 |
6 |
147 |
105 |
553 |
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62.5 |
10.5 |
12.7 |
7 |
145 |
110 |
663 |
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61.5 |
11.2 |
13.3 |
8 |
144 |
115 |
778 |
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61 |
11.7 |
13.9 |
9 |
143 |
120 |
898 |
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60.5 |
12.2 |
14.4 |
10 |
141 |
125 |
1023 |
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59.5 |
12.7 |
14.9 |
11 |
140 |
131 |
1154 |
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59 |
13.1 |
15.3 |
12 |
139 |
134 |
1288 |
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58.5 |
13.5 |
15.7 |
13 |
138 |
136 |
1424 |
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58 |
13.8 |
16 |
14 |
137 |
138 |
1562 |
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57.5 |
14.2 |
16.3 |
15 |
136 |
139 |
1702 |
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57 |
14.5 |
16.6 |
16 |
136 |
139 |
1841 |
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57 |
14.7 |
16.9 |
17 |
135 |
139 |
1980 |
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56.5 |
15 |
17.1 |
18 |
134 |
139 |
2120 |
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56 |
15.2 |
17.4 |
19 |
134 |
139 |
2259 |
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56 |
15.4 |
17.6 |
20 |
133 |
139 |
2399 |
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55.5 |
15.6 |
17.8 |
21 |
132 |
139 |
2538 |
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55 |
15.8 |
18 |
22 |
132 |
139 |
2678 |
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55 |
16 |
18.2 |
23 |
132 |
139 |
2817 |
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55 |
16.2 |
18.3 |
24 |
131 |
139 |
2956 |
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54.5 |
16.4 |
18.5 |
25 |
131 |
139 |
3096 |
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54.5 |
16.5 |
18.7 |
26 |
130 |
139 |
3235 |
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54 |
16.7 |
18.8 |
27 |
130 |
139 |
3375 |
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54 |
16.8 |
19 |
28 |
130 |
139 |
3514 |
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54 |
17 |
19.1 |
29 |
129 |
139 |
3654 |
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53.5 |
17.1 |
19.2 |
30 |
129 |
139 |
3793 |
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53.5 |
17.2 |
19.4 |
31 |
129 |
139 |
3933 |
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53.5 |
17.3 |
19.5 |
32 |
129 |
139 |
4072 |
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53.5 |
17.5 |
19.6 |
33 |
128 |
139 |
4211 |
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53 |
17.6 |
19.7 |
34 |
128 |
139 |
4351 |
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53 |
17.7 |
19.8 |
35 |
128 |
139 |
4490 |
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53 |
17.8 |
19.9 |
36 |
128 |
139 |
4630 |
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53 |
17.9 |
20 |
37 |
128 |
139 |
4769 |
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53 |
18 |
20.1 |
38 |
128 |
139 |
4909 |
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53 |
18.1 |
20.2 |
39 |
127 |
139 |
5048 |
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52.5 |
18.2 |
20.3 |
40 |
127 |
139 |
5187 |
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52.5 |
18.3 |
20.4 |
41 |
127 |
139 |
5327 |
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52.5 |
18.4 |
20.5 |
42 |
127 |
139 |
5466 |
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52.5 |
18.5 |
20.6 |
43 |
127 |
139 |
5606 |
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52.5 |
18.5 |
20.7 |
44 |
127 |
139 |
5745 |
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52.5 |
18.6 |
20.8 |
45 |
127 |
139 |
5885 |
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52.5 |
18.7 |
20.9 |
46 |
127 |
139 |
6024 |
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52.5 |
18.8 |
20.9 |
47 |
127 |
139 |
6164 |
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52.5 |
18.9 |
21 |
48 |
127 |
139 |
6303 |
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52.5 |
18.9 |
21.1 |
49 |
127 |
139 |
6442 |
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52.5 |
19 |
21.2 |
50 |
126 |
139 |
6582 |
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52 |
19.1 |
21.2 |
51 |
126 |
139 |
6721 |
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52 |
19.2 |
21.3 |
52 |
126 |
139 |
6861 |
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52 |
19.2 |
21.4 |
53 |
126 |
139 |
7000 |
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52 |
19.3 |
21.5 |
54 |
126 |
139 |
7140 |
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52 |
19.4 |
21.5 |
55 |
126 |
139 |
7279 |
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52 |
19.4 |
21.6 |
56 |
126 |
139 |
7418 |
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52 |
19.5 |
21.7 |
57 |
126 |
139 |
7558 |
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52 |
19.6 |
21.7 |
58 |
126 |
139 |
7697 |
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52 |
19.6 |
21.8 |
59 |
126 |
139 |
7837 |
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52 |
19.7 |
21.8 |
60 |
126 |
139 |
7976 |
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52 |
19.7 |
21.9 |
61 |
126 |
139 |
8116 |
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52 |
19.8 |
22 |
62 |
126 |
139 |
8255 |
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52 |
19.9 |
22 |
63 |
126 |
139 |
8395 |
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52 |
19.9 |
22.1 |
64 |
126 |
139 |
8534 |
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52 |
20 |
22.1 |
65 |
126 |
139 |
8673 |
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52 |
20 |
22.2 |
66 |
126 |
139 |
8813 |
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52 |
20.1 |
22.2 |
67 |
126 |
139 |
8952 |
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52 |
20.1 |
22.3 |
68 |
126 |
139 |
9092 |
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52 |
20.2 |
22.3 |
69 |
126 |
139 |
9231 |
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52 |
20.2 |
22.4 |
70 |
126 |
139 |
9371 |
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52 |
20.3 |
22.4 |
71 |
126 |
139 |
9510 |
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52 |
20.3 |
22.5 |
72 |
126 |
139 |
9649 |
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52 |
20.4 |
22.5 |
73 |
126 |
139 |
9789 |
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52 |
20.4 |
22.6 |
74 |
126 |
139 |
9928 |
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52 |
20.5 |
22.6 |
75 |
126 |
139 |
10068 |
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52 |
20.5 |
22.7 |
76 |
126 |
139 |
10207 |
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52 |
20.6 |
22.7 |
77 |
126 |
139 |
10347 |
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52 |
20.6 |
22.8 |
78 |
126 |
139 |
10486 |
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52 |
20.7 |
22.8 |
79 |
126 |
139 |
10626 |
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52 |
20.7 |
22.9 |
80 |
126 |
139 |
10765 |
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52 |
20.8 |
22.9 |
81 |
126 |
139 |
10904 |
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52 |
20.8 |
23 |
82 |
126 |
139 |
11044 |
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52 |
20.9 |
23 |
83 |
126 |
139 |
11183 |
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52 |
20.9 |
23 |
84 |
126 |
139 |
11323 |
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52 |
20.9 |
23.1 |
85 |
126 |
139 |
11462 |
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52 |
21 |
23.1 |
86 |
126 |
139 |
11602 |
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52 |
21 |
23.2 |
87 |
126 |
139 |
11741 |
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52 |
21.1 |
23.2 |
88 |
126 |
139 |
11880 |
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52 |
21.1 |
23.3 |
89 |
126 |
139 |
12020 |
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52 |
21.1 |
23.3 |
90 |
126 |
139 |
12159 |
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52 |
21.2 |
23.3 |
91 |
126 |
139 |
12299 |
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52 |
21.2 |
23.4 |
92 |
126 |
139 |
12438 |
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52 |
21.3 |
23.4 |
93 |
126 |
139 |
12578 |
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52 |
21.3 |
23.4 |
94 |
126 |
139 |
12717 |
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52 |
21.3 |
23.5 |
95 |
126 |
139 |
12857 |
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52 |
21.4 |
23.5 |
96 |
126 |
139 |
12996 |
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52 |
21.4 |
23.6 |
97 |
126 |
139 |
13135 |
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52 |
21.4 |
23.6 |
98 |
126 |
139 |
13275 |
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52 |
21.5 |
23.6 |
99 |
126 |
139 |
13414 |
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52 |
21.5 |
23.7 |
100 |
126 |
139 |
13554 |
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52 |
21.6 |
23.7 |
101 |
126 |
139 |
13693 |
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52 |
21.6 |
23.7 |
102 |
126 |
139 |
13833 |
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52 |
21.6 |
23.8 |
103 |
126 |
139 |
13972 |
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52 |
21.7 |
23.8 |
104 |
126 |
139 |
14112 |
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52 |
21.7 |
23.8 |
105 |
126 |
139 |
14251 |
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52 |
21.7 |
23.9 |
106 |
126 |
139 |
14390 |
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52 |
21.8 |
23.9 |
107 |
126 |
139 |
14530 |
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52 |
21.8 |
23.9 |
108 |
126 |
139 |
14669 |
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52 |
21.8 |
24 |
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COMMENTS |
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The abbreviation "IT" means "Insert To", it is the construction distance from the element tip to the edge of the boom for through boom mounting |
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Spacings measured centre to centre from previous element |
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Tolerance for element lengths is +/- 1 mm |
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Boom position is the mounting point for each element as measured from the rear of the boom and includes the 30 mm overhang.The total boom length is 14699 mm including two overhangs of 30 mm |
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The beam's estimated 3dB beamwidth is 13 deg |
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A half wave 4:1 balun uses 0.66 velocity factor RG-58 (PE) and is 115 mm long plus leads |
FOLDED DIPOLE CONSTRUCTION |
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Measurements are taken from the inside of bends |
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Folded dipole length measured tip to tip = 178mm |
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Total rod length =387mm |
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Centre of rod=193mm |
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Distance BC=CD=72mm |
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Distance HI=GF=67mm |
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Distance HA=GE=94mm |
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Distance HB=GD=122mm |
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Distance HC=GC=193mm |
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Gap at HG=10mm |
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Bend diameter BI=DF=35mm |
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