| LNB VSWR | Feed VSWR | VSWR loss | Efective LNB NF |
| 3.5 : 1 | 1 : 1 | 75 K | 30 K + 75 K = 105 K |
| 3.0: 1 | 1 : 1 | 59 K | 30 K + 59 K = 89 K |
| 2.5 : 1 | 1 : 1 | 51 K | 30 K + 51 K = 81 K |
| 2.0 : 1 | 1 : 1 | 39 K | 30 K + 39 K = 69 K |
A Ku-band example using a measured figure of 0.8 dB would be:
| LNB VSWR | Feed VSWR | VSWR loss | Efective LNB NF |
| 3.5 : 1 | 1 : 1 | 1.6 dB | 0.8 dB + 1.6 dB = 2.4 dB |
| 3.0: 1 | 1 : 1 | 1.2 dB | 0.8 dB + 1.2 dB = 2.0 dB |
| 2.5 : 1 | 1 : 1 | 0.8 dB | 0.8 dB + 0.8 dB = 0.8 dB |
| 2.0 : 1 | 1 : 1 | 0.5 dB | 0.8 dB + 0.5 dB = 1.3 dB |
It is important to consider the effects of VSWR when making your LNB selection as the effect of VSWR on the noise figure of an LNB can be substantial.
