standards but can still do comparable harm to the substantial amount of important radio astronomy observation that occurs at spectral lines and frequencies of opportunity outside the protected radio astronomy bands. Although a substantial basis already exists for quantitative evaluation of the SPS radio interference, specific uncertainties concerning properties of the SPS and of radio astronomy equipment still remain and in several cases preclude quantitative estimates of effects. The report of the radio working group offers those quantitative estimates that can be made now, makes a number of recommendations for further investigation, and urges that an ongoing panel be constituted to evaluate the impact of SPS as the design of the system evolves.
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