the transmitting array and because rectenna scattering and noise generation will have to be taken into account. Such effects will require careful study if the observatory's research is not to be unnecessarily affected. This discussion is based on current operations at the Arecibo Observatory. The present 1000-ft telescope is a general-purpose instrument with enormous pressure for observing time from its widely-diversified user community. There are at present no plans to duplicate this facility; and as a unique instrument it is expected to continue in operation for many decades. Extrapolating into the future, there are plans to erect a 100-m aperture all-sky telescope, with wavelength coverage extending down to 1 cm. The SPS therefore poses a very real threat if out-of-band radiation cannot be controlled to the required strict thresholds stated in CCIR 224-4.
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