Scope and limits

FEBRUARY 1978, MARKED PRELIMINARY DRAFT. The power distribution is not this document's own - it is Figure A after Reference R-39, for one 5 GW system. The edge-of-hemisphere density is 0.3 microwatt per square METRE; the document also prints it as 0.3 microwatts/cm2 two pages earlier and the two differ by 10,000 - see SRC-111's source row, where that and four other reading hazards are recorded. THE CATASTROPHIC END APPLIES TO MICROWAVE RECEIVERS AND MUST NOT BE QUOTED AS APPLYING TO ELECTRONICS GENERALLY; the same passage says other electronics would be shielded "to some degree" by their enclosures and could be operated with precautions, and it does not say receivers cannot be fixed: it says they could be modified, at a cost and effectiveness not determined. Nothing here establishes any effect at a stated distance for any modern design, and the register holds no more recent assessment of hemisphere-wide incidental exposure. THE POWER DISTRIBUTION BEHIND POINT I COMES FROM A DOCUMENT THE ARCHIVE DOES NOT HOLD, ESTABLISHED 2026-09-15. SRC-111's Figure A is after its reference R-39: R. M. Dickinson, "Satellite Power System (SPS) Microwave Subsystem Impacts and Benefits", JPL, 28 September 1977. Not held. Every distance in this record and in CLM-0926 - the 20 to 30 km, the 500 to 1000 km, the 15 km and the 7 km - is read against that distribution, and SRC-439 cites it by name for the same purpose: "see figure A, Battelle report". So two registered records and a third document all rest on one unheld 1977 JPL figure, and that is the single most load-bearing absence XC01's collection gap has surfaced. THE DOCUMENT IS NOW HELD, 2026-09-15, AND THIS FIELD'S STATEMENT THAT IT IS NOT IS SUPERSEDED. R-39 was acquired as SRC-450 - JPL 900-800, NASA-CR-157951, 105 pages, open on NTRS at no cost, identity confirmed from its title page rather than a catalogue entry. It is not yet read beyond the title page, so every distance in this record still rests on SRC-111's rendering of Figure A rather than on Figure A; what has changed is that the check is now possible and costs a read. FIGURE A IS NOW HELD AND READ, AND IT DOES NOT CARRY THE DISTANCES THIS RECORD READS AGAINST IT. ESTABLISHED 2026-09-15, VERIFIED FIRST-HAND. SRC-111's Figure A is SRC-450's Figure 1-9, "SPS 10-dB taper array pattern", PDF p.24 - identified by matching SRC-111's own figure text against it, both carrying km RADIUS AT EQUATOR, 10 m SUBARRAY, 1 min ARC ATTITUDE CONTROL, GRATING LOBES and % FAILURES. ITS AXES ARE GAIN IN dBi AND dB RELATIVE TO PEAK, AGAINST ANGLE FROM BORESIGHT IN DEGREES, with a secondary top scale in km radius at equator. THERE IS NO POWER-DENSITY AXIS. Power density appears only as four horizontal reference lines - 10 mW/cm2 OSHA, 1 mW/cm2 OVEN, 0.1 mW/cm2 LeRC-JSC, 0.01 mW/cm2 EE. SO ANY DISTANCE FOR A THRESHOLD OTHER THAN THOSE FOUR LINES REQUIRES A POWER BUDGET TO TURN GAIN INTO POWER DENSITY, AND SRC-439'S THRESHOLDS ARE FIELD STRENGTHS FROM MILITARY STANDARDS - 194 V/m, 135 dB uV/m, 100 dB uV/m - WHICH ARE NOT ON THIS FIGURE AT ALL. THE CORRECT AND WEAKER STATEMENT IS THAT THE FIGURE SUPPORTS THE GEOMETRY AND THAT THE SPECIFIC DISTANCES ARE DERIVED RATHER THAN READ. The geometry does check: 500 to 1000 km sits at roughly 0.8 to 1.6 degrees on the top scale, which is the grating-lobe region the figure labels and Dickinson's text treats as the whole problem, and 15 km sits near the 0.01 mW/cm2 line. What remains unchecked is the conversion, which neither SRC-111 nor SRC-439 shows.