Value chain · CLM-1104
In plain terms
The siting maps kept receivers 150 km from radio telescopes, 100 km from NASA's deep-space stations, 60 km from air traffic radars and 50 km from nuclear plants, on asserted distances; because those places are mostly excluded for other reasons too, the electromagnetic rules only cost about seven per cent of the country.
The claim as recorded
The 1980 siting study excluded land around electromagnetically sensitive facilities in seven classes by separation distance, absolute (A-150, A-100, A-50 km) and potential (P-150, P-100, P-60, P-50 km): radio astronomy at 150 km as a potential exclusion because "any rectenna location within 150 kilometers of a radio astronomy facility would" seriously impair it and the effect cannot be mitigated, "classified as a potential 150 notwithstanding the inability to mitigate the adverse effects of the SPS" because it does not involve human safety; optical astronomy at 60 km in the appendix text and Exhibit B-6 but tabulated under P-50 in Exhibit B-7; "All nuclear power plants are A-50 variables", 106 of them; civilian air-traffic-control radar at P-60, 125 facilities; Goldstone and Goddard at A-100; Exhibit B-7 totalling 273 facilities (A-150 6, A-100 4, A-50 118, P-150 4, P-100 2, P-60 125, P-50 14). The EMC variables collectively cover 11,700 cells but their net incremental exclusion is 3,600 cells, about 7 per cent of the land area.
Evidence behind this: T3-the siting study's own electromagnetic-compatibility exclusion classes, with the distances asserted, not derived, in the pages read.
Scope and limits
THE DISTANCES ARE ASSERTED IN THE APPENDIX WITHOUT A CALCULATION IN THE PAGES READ, AND THE TEXT AND THE EXHIBIT DISAGREE ON THE ABSOLUTE COUNT (126 in the text, 128 in Exhibit B-7: A-100 2 against 4, A-50 106 against 118, and the text's own parts sum to 114), AND OPTICAL ASTRONOMY IS CLASSED P-60 IN THE TEXT AND EXHIBIT B-6 BUT TABULATED UNDER P-50 IN EXHIBIT B-7 AND THE APPENDIX'S OWN COUNT. The same text-against-exhibit disagreement holds for Goldstone and Goddard: p.217 classes them A-100 and Exhibit B-6 prints them at 100 km, but Exhibit B-7's four A-100 entries are the two military rows (air defence 2, ballistic missile defence 2) and the two civilian space-communications facilities are tabulated under P-100 as special research, space communications, 2; the claim's Goldstone and Goddard at A-100 and its A-100 count of 4 are each true of their own page but not of each other (read at the render 2026-09-20). A 1980 facility list. The radio astronomy separation is a siting convenience, not an interference calculation; the register's interference records (CLM-0918 and the XC01 chain) are the physics.
What it assumes
No assumptions are recorded against this claim.
Where it comes from
PDF 214 / printed 205, normalised: "any rectenna location within 150 kilometers of a radio astronomy facility would" seriously impair it; "this variable has been classified as a potential 150 notwithstanding the inability to mitigate the adverse effects of the SPS"; "All nuclear power plants are A-50 variables"; optical astronomy's 60 km and the Goldstone and Goddard A-100 classification are render readings of PDF 214-217. PDF 217 / printed 208, normalised: "there are a total of 126 absolute exclusions, 6 of which are in the A-150 category, 2 in the A-100 category and 106 in the A-50 category"; raw: "125 in the P-60 category which includes all air traffic control radar". PDF 218 / printed 209, Exhibit B-7 (layer and render): totals 6, 4, 118, 4, 2, 125, 14 = 273, with nuclear power 106 and special material processing 12 in A-50, transportation safety 114 in P-60, radio astronomy 4 in P-150, optical astronomy 9 in P-50 (render read: the P-60 column is 11 + 114 = 125 and the P-50 column 1 + 4 + 9 = 14). PDF 12 / printed 3, Exhibit 1: the class names and "Numbers refer to minimum separation, in kilometers, from the nearest rectenna" (raw). PDF 18 / printed 9: the 11,700 and 3,600 cells (normalised, in CLM-1103).
Basis: km of separation from a rectenna; count of facilities per class
Related records
- Answers question
- QST-007 not published in this release
Cite this
energyaperture.com/c/clm-1104
CLM-1104, Energy Aperture, as of 1980-04.
Connected records
Other published records linked to this one. A list, not a judgement.
- Also from SRC-565
- CLM-1102The receiving station the siting maps were drawn for is an oval twelve kilometres wide and, in the middle of the United States, sixteen...CLM-1103Mapped at the scale of one receiver per cell, two-fifths of the country was not ruled out; look closer and seven in ten of those cells fail...