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Boom Correction

BOOM CORRECTION AS PER DL6WU FORMULA

144 MHz
BOOM DIAMETER NOT INSULATED THROUGH THE BOOM INSULATED THROUGH THE BOOM
IN [ mm ] CORRECTION IN [ mm ] CORRECTION IN [ mm ]
10 1.7 0.8
12 2.2 1.1
14 2.9 1.4
15 3.2 1.6
16 3.6 1.8
18 4.4 2.2
20 5.2 2.6
22 6.1 3.0
24 7.0 3.5
25 7.5 3.7
26 8.0 4.0
28 9.0 4.5
30 10.1 5.0
32 11.2 5.6
34 12.4 6.2
35 13.0 6.5
36 13.6 6.8
38 14.9 7.5
40 16.2 8.1
42 17.6 8.8
45 19.7 9.9
48 21.9 11.0
50 23.4 11.7

 

432 MHz

BOOM DIAMETER

NOT INSULATED THROUGH THE BOOM

INSULATED THROUGH THE BOOM

IN [ mm ]

 CORRECTION IN [ mm ] CORRECTION IN [ mm ]

10

3.4

1.7

12

4.5

2.3

14

5.9

2.9

15

6.6

3.3

16

7.3

3.7

18

8.9

4.4

20

10.6

5.3

22

12.3

6.2

24

14.2

7.1

25

15.2

7.6

26

16.3

8.1

28

18.4

9.2

30

20.6

10.3

32

22.9

11.4

34

25.3

12.6

35

26.5

13.3

36

27.8

13.9

38

30.4

15.2

40

33.1

16.5

42

35.8

17.9

45

40.2

20.1

48

44.7

22.3

50

47.8

23.9

 

If you are in doubt or this information is not enough to understand what and how to  to do it, You may go to web pages of DG7YBN who did extensive and very detailed study of boom correction issue. He has even developed useful and comprehensive program to help You calculate right correction for Your type of antenna construction.

http://dg7ybn.de/BC_numbers/BC.htm