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How's Your SWR?

As everyone knows, the higher your SWR (Standing Wave Ratio) the less efficient your antenna is. I searched everywhere on the internet internet looking for a Chart or Excel spreadsheet that would tell me the power loss to expect for a given SWR. I own an Array Solutions AIM-4170b Antenna Analyzer, so I set out to create my own chart, as I have a bunch of antennas at my QTH, and I have several friends with antennas. I wanted to scan as many antennas as possible.

After scanning about a dozen HF antennas, I put the data into Excel and let Excel do it's magic.

So here is a Chart showing how SWR effects how much power you actually radiate from your antenna.

Chart showing Antenna Efficiency at different SWR

Here is the actual data:
(or click here for excel spreadsheet)

SWR %Reflected Power % Power Out
1.10 0.11 99.89
1.20 0.52 99.48
1.30 1.35 98.65
1.40 2.37 97.63
1.50 3.80 96.20
1.60 4.92 95.08
1.70 7.10 92.90
1.80 7.56 92.44
1.90 9.22 90.78
2.00 10.71 89.29
2.10 11.91 88.09
2.20 13.53 86.47
2.30 15.11 84.89
2.40 16.99 83.01
2.50 18.61 81.39
2.60 19.11 80.89
2.70 20.71 79.29
2.80 22.18 77.82
2.90 23.11 76.89
3.00 24.91 75.09
3.10 25.92 74.08
3.20 27.12 72.88
3.30 28.30 71.70
3.40 29.62 70.38
3.50 30.72 69.28
3.60 31.80 68.20
3.70 32.68 67.32
3.80 33.82 66.18
3.90 34.98 65.02
4.00 35.73 64.27
4.10 36.69 63.31
4.20 37.81 62.19
4.30 38.46 61.54
4.40 39.21 60.79
4.50 40.08 59.92
4.60 41.02 58.98
4.70 41.92 58.08
4.80 42.55 57.45
4.90 43.39 56.61
5.00 44.25 55.75
5.10 44.95 55.05
5.20 45.56 54.44
5.30 46.26 53.74
5.40 46.93 53.07
5.50 47.63 52.37
5.60 48.35 51.65
5.70 49.03 50.97
5.80 49.58 50.42
5.90 50.56 49.44
6.00 51.11 48.89
6.10 51.67 48.33
6.20 51.90 48.10
6.30 52.49 47.51
6.40 53.11 46.89
6.50 53.89 46.11
6.60 54.09 45.91
6.70 54.56 45.44
6.80 55.06 44.94
6.90 55.67 44.33
7.00 56.13 43.87
7.10 56.54 43.46
7.20 57.05 42.95
7.30 57.46 42.54
7.40 58.02 41.98
7.50 58.31 41.69
7.60 58.73 41.27
7.70 59.16 40.84
7.80 59.59 40.41
7.90 59.92 40.08
8.00 60.31 39.69
8.10 60.71 39.29
8.20 61.09 38.91
8.30 61.44 38.56
8.40 61.80 38.20
8.50 62.23 37.77
8.60 62.61 37.39
8.70 62.85 37.15
8.80 63.21 36.79
8.90 63.72 36.28
9.00 63.85 36.15
9.10 64.20 35.80
9.20 64.53 35.47
9.30 64.82 35.18
9.40 65.18 34.82
9.50 65.39 34.61
9.60 65.95 34.05
9.70 65.97 34.03
9.80 66.40 33.60
9.90 66.56 33.44
10.00 66.87 33.13
10.10 67.31 32.69
10.20 67.38 32.62
10.30 67.66 32.34
10.40 67.95 32.05
10.50 68.22 31.78
10.60 68.45 31.55
10.70 68.67 31.33
10.80 68.86 31.14
10.90 69.12 30.88
11.00 69.34 30.66
11.10 69.68 30.32
11.20 69.98 30.02
11.30 70.09 29.91
11.40 70.35 29.65
11.50 70.58 29.42
11.60 70.88 29.12
11.70 71.03 28.97
11.80 71.09 28.91
11.90 71.35 28.65
12.00 71.53 28.47
12.10 71.70 28.30
12.20 71.90 28.10
12.30 72.16 27.84
12.40 72.34 27.66
12.50 72.51 27.49
12.60 72.67 27.33
12.70 72.92 27.08
12.80 73.03 26.97
12.90 73.21 26.79
13.00 73.40 26.60
13.10 73.58 26.42
13.20 73.73 26.27
13.30 74.02 25.98
13.40 74.10 25.90
13.50 74.25 25.75
13.60 74.43 25.57
13.70 74.59 25.41
13.80 74.75 25.25
13.90 74.92 25.08
14.00 75.06 24.94
14.10 75.20 24.80
14.20 75.35 24.65
14.30 75.50 24.50
14.40 75.64 24.36
14.50 75.82 24.18
14.60 75.94 24.06
14.70 76.12 23.88
14.80 76.28 23.72
14.90 76.43 23.57
15.00 76.50 23.50
15.10 76.65 23.35
15.20 76.86 23.14
15.30 77.01 22.99
15.40 77.07 22.93
15.50 77.20 22.80
15.60 77.35 22.65
15.70 77.49 22.51
15.80 77.60 22.40
15.90 77.78 22.22
16.00 77.82 22.18
16.20 78.10 21.90
16.30 78.23 21.77
16.40 78.28 21.72
16.50 78.39 21.61
16.60 78.59 21.41
16.70 78.68 21.32
16.80 78.77 21.23
16.90 78.89 21.11
17.00 79.00 21.00
17.10 79.09 20.91
17.20 79.18 20.82
17.30 79.30 20.70
17.40 79.40 20.60
17.50 79.51 20.49
17.60 79.68 20.32
17.70 79.75 20.25
17.80 79.81 20.19
17.90 79.91 20.09
18.00 80.01 19.99
18.10 80.11 19.89
18.20 80.23 19.77
18.30 80.31 19.69
18.40 80.41 19.59
18.50 80.51 19.49
18.60 80.59 19.41
18.70 80.68 19.32
18.80 80.84 19.16
18.90 80.94 19.06
19.00 80.99 19.01
19.10 81.09 18.92
19.20 81.14 18.86
19.30 81.23 18.77
19.40 81.36 18.64
19.50 81.40 18.60
19.60 81.48 18.52
19.70 81.58 18.42
19.80 81.70 18.30
19.90 81.75 18.25
20.00 81.83 18.17
20.10 81.93 18.07
20.20 82.03 17.97
20.30 82.07 17.93
20.40 82.17 17.83
20.60 82.32 17.68
20.70 82.41 17.59
20.80 82.46 17.54
20.90 82.56 17.44
21.00 82.61 17.39
21.20 82.76 17.24
21.30 82.85 17.15
21.40 82.97 17.03
21.50 82.98 17.02
21.60 83.09 16.91
21.90 83.32 16.68
22.10 83.45 16.55
22.20 83.53 16.47
22.40 83.63 16.37
22.50 83.67 16.33
22.80 83.89 16.11
22.90 83.99 16.01
23.00 84.04 15.96
23.10 84.10 15.90
23.30 84.24 15.76
23.50 84.35 15.65
23.60 84.38 15.62
23.80 84.51 15.49
23.90 84.59 15.41
24.00 84.64 15.36
24.10 84.68 15.32
24.20 84.75 15.25
24.30 84.81 15.19
24.60 84.98 15.02
25.20 85.31 14.69
25.40 85.44 14.56
25.50 85.46 14.54
25.80 85.61 14.39
25.90 85.69 14.31
26.40 85.94 14.06
26.70 86.07 13.93
26.80 86.12 13.88
26.90 86.19 13.81
27.20 86.31 13.69
27.90 86.64 13.36
28.00 86.66 13.34
28.20 86.79 13.21
28.70 86.99 13.01
29.00 87.11 12.89
29.70 87.38 12.62
29.90 87.46 12.54
30.20 87.57 12.43
30.60 87.75 12.25
30.80 87.83 12.17
31.40 88.02 11.98
32.60 88.45 11.55
33.00 88.58 11.42
33.20 88.65 11.35
33.60 88.77 11.23
34.90 89.17 10.83
35.10 89.24 10.76
36.10 89.51 10.49
37.60 89.90 10.10
38.10 90.02 9.98
39.20 90.29 9.71
40.40 90.58 9.42
40.60 90.63 9.37
42.40 90.99 9.01
43.40 91.19 8.81
43.60 91.23 8.77
44.10 91.33 8.67
46.70 91.79 8.21
47.00 91.85 8.15
48.80 92.13 7.87
50.90 92.45 7.55
51.00 92.45 7.55
52.10 92.61 7.39
54.00 92.86 7.14
55.70 93.07 6.93
57.10 93.23 6.77
57.30 93.26 6.74
59.30 93.48 6.52
61.10 93.66 6.34
65.40 94.07 5.93
66.40 94.15 5.85
69.90 94.43 5.57
71.30 94.54 5.46
73.00 94.67 5.33
74.80 94.79 5.21
81.30 95.20 4.80
82.00 95.24 4.76
86.90 95.50 4.50
88.70 95.59 4.41
96.90 95.95 4.05
104.30 96.24 3.76
112.90 96.52 3.48
114.90 96.58 3.42
115.00 96.58 3.42
122.60 96.79 3.21
136.10 97.10 2.90
144.30 97.27 2.73
146.70 97.31 2.69
166.50 97.63 2.37
191.40 97.93 2.07
210.00 98.11 1.89
225.70 98.24 1.76
256.10 98.45 1.55
261.50 98.48 1.52
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My QTH
(Home Location)

Grid Square: FM18rv78rh

CQ Zone 5
I.T.U Zone 8

Latitude: 38.80785
Longitude: -76.67826

Latitude: N38° 48' 28''
Longitude: W76° 40' 42''

Latitude: 38.910°
Longitude: -76.519°

Find Your Longitude and Latitude here

Page last updated: October 3, 2013 15:15
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