The present disclosure is directed to a method for calibrating a communications device. The method may include the step of determining a first coefficient based on correction data obtained by the transition from an initial open loop power operation to a power level of a closed loop operation. The method may also include the step of determining a second coefficient of transmitter gain based on the power of one or more transmissions by the communications device. A further step of the method may include determining a strength of a downlink signal received by the communications device from a satellite computed from knowledge of a receiver gain represented by the first coefficient. The method may also include the step of determining a transmit power level for the communications device based on the strength of the downlink signal, the first coefficient, and the second coefficient of transmitter gain.