Chairman's Note: The following paper has been submitted by its authors to the British Royal Society of London and is reprinted here by permission of the Society.* Although its analysis is based on SPS parameters which differ somewhat from those of the current Reference System, its conclusions are similar to those of the working group. It is included here as an example of international concern over SPS effects on radio astronomy. The working group's brief discussion of this paper noted that the assumed parametric amplifier receiver first stage represents a worst case for out-of-passband overload sensitivity. While parametric amplifiers are extremely useful and widely used, and while all likely alternatives exhibit qualitatively similar overload phenomena, it seems likely that quantitative improvements in the overload performance of low noise receivers can be expected in the next two decades. * The present text was retyped at PNL to improve reproducibility and PNL accepts responsibility for any typographic errors.
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