Specifications

Chapter 15 161
Concepts
Stimulus Response Measurement Concepts
Concepts
Where: RL is the measured return loss value.
VSWR is sometimes stated as a ratio. For example: 1.2:1 “one point two
to one” VSWR. The first number is the VSWR value taken from the
table or calculated using the formula. The second number is always 1.
8.0 2.32 14.4 1.47 19.0 1.25 29.0 1.07 39.0 1.02
10.0 1.92 14.6 1.46 19.5 1.24 29.5 1.07 39.5 1.02
10.5 1.85 14.8 1.44 20.0 1.22 30.0 1.07 40.0 1.02
11.0 1.78 15.0 1.43 20.5 1.21 30.5 1.06 40.5 1.02
11.2 1.76 15.2 1.42 21.0 1.20 31.0 1.06 41.0 1.02
11.4 1.74 15.4 1.41 21.5 1.18 31.5 1.05 41.5 1.02
11.6 1.71 15.6 1.40 22.0 1.17 32.0 1.05 42.0 1.02
11.8 1.69 15.8 1.39 22.5 1.16 32.5 1.05 42.5 1.02
12.0 1.67 16.0 1.38 23.0 1.15 33.0 1.05 43.0 1.01
12.2 1.65 16.2 1.37 23.5 1.14 33.5 1.04 43.5 1.01
12.4 1.63 16.4 1.36 24.0 1.13 34.0 1.04 44.0 1.01
12.6 1.61 16.6 1.35 24.5 1.13 34.5 1.04 44.5 1.01
12.8 1.59 16.8 1.34 25.0 1.12 35.0 1.04 45.0 1.01
13.0 1.58 17.0 1.33 25.5 1.11 35.5 1.03 45.5 1.01
13.2 1.56 17.2 1.32 26.0 1.11 36.0 1.03 46.0 1.01
13.4 1.54 17.4 1.31 26.5 1.10 36.5 1.03 46.5 1.01
13.6 1.53 17.6 1.30 27.0 1.09 37.0 1.03 47.0 1.01
13.8 1.51 17.8 1.30 27.5 1.09 37.5 1.03 47.5 1.01
Table 15-6 Power to VSWR Conversion
Return
Loss
(dB)
VSWR Return
Loss
(dB)
VSWR Return
Loss
(dB)
VSWR Return
Loss
(dB)
VSWR Return
Loss
(dB)
VSWR
VSWR
110
RL–
20
----------
+
110
RL–
20
----------
–
-----------------------=