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Antenna Loss in % based on SWR

by on Jul.30, 2014, under Ham Radio

 

SWR READING % OF POWER LOSS OUTPUT TO ANTENNA*
1.0:1 0.0% 100.0%
1.1:1 0.3% 99.7%
1.2:1 0.8% 99.2%
1.3:1 1.7% 98.3%
1.4:1 2.7% 97.3%
1.5:1 3.0% 97.0%
1.6:1 5.0% 95.0%
1.7:1 6.0% 94.0%
1.8:1 8.0% 92.0%
2.0:1* 11.0% 89.0%
2.2:1 14.0% 86.0%
2.4:1 17.0% 83.0%
2.6:1 20.0% 80.0%
3.0:1 25.0% 75.0%
4.0:1 38.0% 62.0%
5.0:1 48.0% 52.0%
6.0:1 55.0% 45.0%
10.0:1 70.0% 30.0%

*Percentage of OUTPUT Power with perfect antenna load
and no other losses in the antenna system!
*SWR 2.0:1* Most transceivers start to reduce power at this SWR level

A Yaesu FT-857 starts to turn down the power at a 3:1 SWR.


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