A It all depends on whose transmitter you have bought. An Invacom 2W transmitter can be operated at 2W without any problems. This is because it will meet all the Eutelsat & Intelsat specifications when working at its rated power. However, when many manufacturers rate their transmitter at 2W they mean the P1dB ( the output power where the gain has compressed by 1dB) is 2W. If you were to operate the transmitter at this level, you would splatter unwanted power into adjacent satellite channels. Typically a transmitter will need to be operated around 1.5dB below it's P1dB power. The typical P1dB for an Invacom 2W transmitter is +35dBm (3W) allowing the unit to meet full specification at 2W