Quote Originally Posted by Fredrick View Post
The maximun output power for the transmitter is 14DBm or 25.11mW
Is that correct?
No.

From ELECTRICAL SPECIFICATIONS/TRANSMITTER SECTION/Output Power:

At 2.1V the power is - 4dBm = 0.398 mW
At 3.0V the power is 0dBm = 1 mW
At 3.6V the power is 4dBm = 2.511 mW

Do not modify the hardware you got from Parallax.
1 mW or 2.5 mW do not make any difference.