EIRP, Gain of antenna (Multiple choice Qn)

[kukumaluboy]

Homework Statement

The Effective Isotropic Radiated Power of an antenna is 60dBm. If the gain of the antenna is 30dB what is the input power to the antenna?


(a) 3W
(b) 2W
(c) 4W
(d) 5W

Homework Equations

EIRP = Power x Gain (in watts)
EIRP = Power + gain (in dbm)

The Attempt at a Solution

Sorry this is the first time i encounter a gain with unit dB. normally it would be dBi there fore i could just add it up.

 

[berkeman]

Homework Statement

The Effective Isotropic Radiated Power of an antenna is 60dBm. If the gain of the antenna is 30dB what is the input power to the antenna?


(a) 3W
(b) 2W
(c) 4W
(d) 5W

Homework Equations

EIRP = Power x Gain (in watts)
EIRP = Power + gain (in dbm)

The Attempt at a Solution

Sorry this is the first time i encounter a gain with unit dB. normally it would be dBi there fore i could just add it up.

dBm is dB above a milliwatt into 50 Ohms. Does that help?