A scientist budgeting a capture that may outlive GPS lock needs a numeric holdover drift rate. There is none published. docs/METROLOGY.md §4.5 ranks T1 ("coasting on the GPSDO") with const offset at snapshot + 0 drift and its prose calls it "a degraded holdover, not a steady operating point" — but zero drift is an idealisation of an A1 timebase that is ppb-stable, not perfect, and no doc, config comment or issue in the repo gives a µs/hour figure to budget against (grepped hf-timestd/docs/*.md, 2026-08-23: the only 1.44 hits are the ionospheric foE coefficient). The authority manager already persists per-cycle records to /var/lib/timestd/authority_history.db, so the number is measurable from data the station already keeps; publishing it (or the measurement method) would let a client decide whether an unanchored hour is usable.
Docs page(s) blocked/affected: sigmond/docs/scientist/station-capabilities.md §Timing, sigmond/docs/scientist/data-and-timing.md
Provenance: docs-gap ledger row 33, HamSCI/sigmond docs/contributor/docs-gap-ledger.md (2026-08 documentation program, Phase 2).
Related: #25
A scientist budgeting a capture that may outlive GPS lock needs a numeric holdover drift rate. There is none published.
docs/METROLOGY.md§4.5 ranks T1 ("coasting on the GPSDO") withconst offset at snapshot + 0 driftand its prose calls it "a degraded holdover, not a steady operating point" — but zero drift is an idealisation of an A1 timebase that is ppb-stable, not perfect, and no doc, config comment or issue in the repo gives a µs/hour figure to budget against (greppedhf-timestd/docs/*.md, 2026-08-23: the only1.44hits are the ionosphericfoEcoefficient). The authority manager already persists per-cycle records to/var/lib/timestd/authority_history.db, so the number is measurable from data the station already keeps; publishing it (or the measurement method) would let a client decide whether an unanchored hour is usable.Docs page(s) blocked/affected: sigmond/docs/scientist/station-capabilities.md §Timing, sigmond/docs/scientist/data-and-timing.md
Provenance: docs-gap ledger row 33, HamSCI/sigmond
docs/contributor/docs-gap-ledger.md(2026-08 documentation program, Phase 2).Related: #25