Some Norsat terminals include local loop-back capability. If this applies, check that your transmitted signal appears in the built-in Transmit Spectrum Analyzer. If you are certain that your transmitter is functioning correctly, check that there is no visible damage to the dish that may affect the transmitted signal. In particular, check whether the boom arm might be bent, or if there is any damage to the waveguides.  Finally, make sure that you are pointed at the correct satellite, and that you have peaked the dish as much as possible.