Satellite Communications (SATCOM) Practice Test

If transmitter power Pt increases by 3 dB with all else constant, what happens to EIRP?

3 dB 1 dB 6 dB 0 dB

Correct Answer:

3 dB

Explanation:

EIRP represents the power radiated in a given direction, accounting for the antenna’s directional gain. In dB terms, EIRP is the sum of the transmitter power (in dB) and the antenna gain (in dB): EIRP(dB) = Pt(dB) + Gt(dBi). If the transmitter power increases by 3 dB and the gain stays the same, the EIRP also increases by 3 dB. So the radiated power in the main direction goes up by 3 dB (roughly a doubling of power). The other options would require different changes in Pt or gain, which aren’t present here.

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