Antenna Error Degradations The reference SPS system has an error budget of 10° RMS phase error for the phase control system, ± 0.1 dB amplitude error per power module, 2% failure rate of the d.c.-RF power converter tubes, 1 arcmin antenna mechanical alignment error due to attitude control system errors, and 3 arcmin subarray mechanical alignment errors due to surface warpage. These errors scatter energy from the main beam into the sidelobes. The degradation in energy transmission efficiency due to these electri-
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