raise the pointing standard to ±3 arcmin and still be in the 0.001 mW/cm power density range. The analysis also indicates the grating lobe peaks are very sensitive to changes in antenna or systematic tilt but are relatively insensitive to random or subarray tilts. Hence, the ±3 arcmin subarray tilt requirement is independent of the phase control level. In summarizing the advantages of phase controlling at the power tube level, the grating lobe peaks are wider spaced and the magnitudes are 1/10 to 1/100 of those for 10-m subarrays. Proper rectenna sitings should exclude radio astronomy observatories from grating lobe locations.
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