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JD780A Series Analyzers
Appendix D – VSWR-Return loss conversion table
This information is for the Cable and Antenna Analyzer mode of the JD785A Base Station Analyzer
and the JD786A RF Analyzer.
Return Loss=20log
10
R.L./20
VSWR=(10
+1/10
VSWR
Return
Trans.
Loss
Loss
(dB)
(dB)
1.00
--
0.000
1.01
46.1
0.000
1.02
40.1
0.000
1.03
36.6
0.001
1.04
34.2
0.002
1.05
32.3
0.003
1.06
30.7
0.004
1.07
29.4
0.005
1.08
28.3
0.006
1.09
27.3
0.008
1.10
26.4
0.010
1.11
25.7
0.012
1.12
24.9
0.014
1.13
24.3
0.016
1.14
23.7
0.019
1.15
23.1
0.021
1.16
22.6
0.024
1.17
22.1
0.027
1.18
21.7
0.030
1.19
21.2
0.033
1.20
20.8
0.036
1.21
20.4
0.039
1.22
20.1
0.043
1.23
19.7
0.046
1.24
19.4
0.050
1.25
19.1
0.054
1.26
18.8
0.058
1.27
18.5
0.062
1.28
18.2
0.066
1.29
17.9
0.070
1.30
17.7
0.075
1.32
17.2
0.083
1.34
16.8
0.093
1.36
16.3
0.102
1.38
15.9
0.112
1.40
15.8
0.122
1.42
15.2
0.133
1.44
14.9
0.144
1.46
14.6
0.155
1.48
14.3
0.166
1.50
14.0
0.177
1.52
13.7
0.189
1.54
13.4
0.201
1.56
13.2
0.213
1.58
13.0
0.225
1.60
12.7
0.238
1.62
12.5
0.250
574
(VSWR+1/VSWR-1) (dB)
R.L./20
-1)
Volt.
Power
Power
Refl
Trans
Refl
Coeff
(%)
(%)
0.00
100.0
0.0
0.00
100.0
0.0
0.01
100.0
0.0
0.01
100.0
0.0
0.02
100.0
0.0
0.02
99.9
0.1
0.03
99.9
0.1
0.03
99.9
0.1
0.04
99.9
0.1
0.04
99.8
0.2
0.05
99.8
0.2
0.05
99.7
0.3
0.06
99.7
0.3
0.06
99.6
0.4
0.07
99.6
0.4
0.07
99.5
0.5
0.07
99.5
0.5
0.08
99.4
0.6
0.08
99.3
0.7
0.09
99.2
0.8
0.09
99.2
0.8
0.10
99.1
0.9
0.10
99.0
1.0
0.10
98.9
1.1
0.11
98.9
1.1
0.11
98.8
1.2
0.12
98.7
1.3
0.12
98.6
1.4
0.12
98.5
1.5
0.13
98.4
1.6
0.13
98.3
1.7
0.14
98.1
1.9
0.15
97.9
2.1
0.15
97.7
2.3
0.16
97.5
2.5
0.17
97.2
2.8
0.17
97.0
3.0
0.18
96.7
3.3
0.19
96.5
3.5
0.19
96.3
3.7
0.20
96.0
4.0
0.21
95.7
4.3
0.21
95.5
4.5
0.22
95.2
4.8
0.22
94.9
5.1
0.23
94.7
5.3
0.24
94.4
5.6
VSWR
Return
Loss
(dB)
1.64
12.3
1.66
12.1
1.68
11.9
1.70
11.7
1.72
11.5
1.74
11.4
1.76
11.2
1.78
11.0
1.80
10.9
1.82
10.7
1.84
10.6
1.86
10.4
1.88
10.3
1.90
10.2
1.92
10.0
1.94
9.9
1.96
9.8
1.98
9.7
2.00
9.5
2.50
7.4
3.00
6.0
3.50
5.1
4.00
4.4
4.50
3.9
5.00
3.5
5.50
3.2
6.00
2.9
6.50
2.7
7.00
2.5
7.50
2.3
8.00
2.2
8.50
2.1
9.00
1.9
9.50
1.8
10.00
1.7
11.00
1.6
12.00
1.5
13.00
1.3
14.00
1.2
15.00
1.2
16.00
1.1
17.00
1.0
18.00
1.0
19.00
0.9
20.00
0.9
25.00
0.7
30.00
0.6
Appendix
Trans.
Volt.
Power
Loss
Refl
Trans
(dB)
Coeff
(%)
0.263
0.24
94.1
0.276
0.25
93.8
0.289
0.25
93.6
0.302
0.26
93.3
0.315
0.26
93.0
0.329
0.27
92.7
0.342
0.28
92.4
0.356
0.28
92.1
0.370
0.29
91.8
0.384
0.29
91.5
0.398
0.30
91.3
0.412
0.30
91.0
0.426
0.31
90.7
0.440
0.31
90.4
0.454
0.32
90.1
0.468
0.32
89.8
0.483
0.32
89.5
0.497
0.33
89.2
0.512
0.33
88.9
0.881
0.43
81.6
1.249
0.50
75.0
1.603
0.56
69.1
1.938
0.60
64.0
2.255
0.64
59.5
2.553
0.67
55.6
2.834
0.69
52.1
3.100
0.71
49.0
3.351
0.73
46.2
3.590
0.75
43.7
3.817
0.76
41.5
4.033
0.78
39.5
4.240
0.79
37.7
4.437
0.80
36.0
4.626
0.81
34.5
4.807
0.82
33.1
5.149
0.83
30.6
5.466
0.85
28.4
5.762
0.86
26.5
6.040
0.87
24.9
6.301
0.88
23.4
6.547
0.88
22.1
6.780
0.89
21.0
7.002
0.89
19.9
7.212
0.90
19.0
7.413
0.90
18.1
8.299
0.92
14.8
9.035
0.94
12.5
Power
Refl
(%)
5.9
6.2
6.4
6.7
7.0
7.3
7.6
7.9
8.2
8.5
8.7
9.0
9.3
9.6
9.9
10.2
10.5
10.8
11.1
18.4
25.0
30.9
36.0
40.5
44.4
47.9
51.0
53.8
56.3
58.5
60.5
62.3
64.0
65.5
66.9
69.4
71.6
73.5
75.1
76.6
77.9
79.0
80.1
81.0
81.9
85.2
87.5
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