A NOTE ON CCIR REPORT 224-4 AND THE FUTURE Any interference generated by SPS will affect the radio astronomy measurements being made 20 years from now, not those of today. As an aid to understanding how these measurements might differ from today’s, Hein Hvatum has contributed the following section of an early draft of CCIR 224-4. Tables III and IV, given here, would have paralleled Tables I and II of the report, giving an estimate of what those tables would look like in an updated version of CCIR 224 written about 1990. However, it was judged inappropriate to display two values for each interference threshold, and the entire section containing Tables III and IV was deleted from the final draft of that report. Nonetheless, this section offers a valuable look at the future which can be summarized as follows: By the time SPS could be deployed, the sensitivity of Earthbound radio astronomy will have reached its fundamental limits. In the frequency range most likely to be affected by SPS, signal detection thresholds and the corresponding harmful interference thresholds will have decreased by no more than 4 dB.
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