Eirp - Equivelent Isothropic Radiated power
- Equivelent Isothropic Radiated powerTransmitting (Radio) - Losses (cable,connector,arrestors) + Gains (Antennae) = 256mw
18 - 3db + 10 dbi = 256mw
3db = 2mw
6db = 4mw
9db = 8mw
18-3+10=25db
25db= 256mw approx.