{"id": "card_n_e8186ce33d19", "kind": "note", "title": "GPS (UHF) — a constellation of clocks at 19 centimeters", "body": "L1 = 154 × 10.23 MHz = 1575.42 MHz EXACTLY — the whole system is integer multiples of\none 10.23 MHz atomic clock; sealed, with the 19 cm wavelength: https://narrowhighway.com/s/d6211f4efb2518c6de145decf57f27b131a01c24ce7841853f395b7bc986c323 . A plausible-wrong\nconstant (154 × 10.22) seals BROKEN with residual −1.54 MHz: https://narrowhighway.com/s/88297f0c4371cf9c8f0f61d082270237fc02b13a6672789eb29d17828d59fa8f . What GPS transmits is\nTIME; your position is triangulated delay. The honest boundary: the satellite clocks must be\ncorrected ~38 µs/day for special and general relativity — real, measured, and the reason\nyour map works; deriving it needs Einstein's field equations, not a one-line seal.", "source": {"label": "Concordance assay — 2026-07-09", "url": "https://narrowhighway.com/s/d6211f4efb2518c6de145decf57f27b131a01c24ce7841853f395b7bc986c323", "ref": "spectrum_walk", "authority_tier": "engine_derived"}, "shelf": "science", "box": "radio_spectrum", "bands": ["gps", "l1", "1575.42 mhz", "10.23 mhz", "atomic clock", "uhf", "navigation", "relativity"], "connections": [], "author": "engine", "created_at": "2026-07-10T01:06:08.948754+00:00", "updated_at": "2026-07-10T01:06:08.948754+00:00", "visibility": "public", "lifecycle_stage": "public", "volatility": "permanent", "surface": "secular", "metrics": {"paperclips_count": 0, "helpful_count": 0, "not_helpful_count": 0, "cite_count": 0, "walks_through_count": 0, "flagged_count": 0}, "source_hash": "2b8fb9d17de44489243bd726bd4354b6648d9c4f1999e0a19a837a2d0cd7fe6a"}