Public evidence

electrical.rf.fspl

Machine-checked verification for calculation version 1.0.0 · tier internally_reviewed

Open calculator API Capability Download JSON CVP Manifest MCP Review policy

CVP status

Free-space isotropic model; path_loss_dB is antenna-adjusted link loss (FSPL − Gt − Gr)

Declared partition coverage: PASS · 3/3 declared partitions (isotropic, with-gains, invalid-domain)
Versions: Calculation 1.0.0 · CVP protocol 1.0.0-proposed · Evidence 2026-10-28.meta-metrics-v2
Verification revision: 2026-10-28.meta-metrics-v2 · 4/4 property · digest 65f44b2222f8

Verification

Legacy regression suite: 10/10 calculation tests · Production surface contract 6/6

Three distinct suites: educational examples on the calculator page, this legacy regression count (10/10 golden + boundary), and the CVP verification suite below. They are not the same number. Property, metamorphic, round-trip, O3, and interface statuses/checks are recorded in the CVP Manifest . SKIP (0/0) means that suite has no published vectors.

This calculator CURRENT · Public schema 1.0.0 matches · Semantic contract ✓ · Production attested · Public/cache ✓ · Origin ✓

CVP verification suite

Protocol checks from the Evidence Manifest. Distinct from the legacy regression suite above. Verification revision 2026-10-28.meta-metrics-v2. Calculation version 1.0.0. CVP 1.0.0-proposed. 2/2 golden · 4/4 CVP boundary · 3/3 invalid · 4/4 property · 2/2 metamorphic · 2/2 cross-interface · 6/6 CVP contract. digest 65f44b2222f8.

Golden (oracle-backed) 2 / 2
CVP boundary 4 / 4
Invalid input 3 / 3
Property 4 / 4
Metamorphic 2 / 2
Cross-interface 2 / 2
CVP contract 6 / 6
Interfaces PASS · UI (SSR) / REST / MCP
Interface claim ui-ssr is query-result HTML, not a live browser session. CVP-UI-01: canonical SI is the only calculation source. Mixed share URLs (d_m + fsplDInput without fsplDUnit) must still yield FSPL. Live Chromium session is npm run test:fspl-live-e2e — not executed inside this SSR/REST/MCP probe.
Assurance Engineering

release artifacts aligned PASS
schema output required declared PASS
schema valid input executes PASS
engine success output validates schema PASS
schema rejects incomplete input PASS
rest success payload validates schema PASS

Fingerprint sha256:c7a8b2174f78935dc58ed709b0e1449baaa02910ae4df9cb845a1c5cacf381d1

Input schema sha256:15a38c2c350af9df0aa158b3922ecbf7bb4ca0c425c2052715ea6b2091759591 · Output schema sha256:05956bcab131a871e415bc3b8b424c44a4a6abdc6b6b8841cc85cef1533e09ad · Build-time SHA-256 digests prove published artifacts agree with each other (release_integrity.scope=workspace). Production attestation GETs canonical URLs twice (public/cached view and origin), including Capability HTML, via npm run attest:production --write (published at /.well-known/calculatorx-production-attestation.json) and fails if the public Capability page advertises a different calculation_version. This is artifact consistency, not an independent immutable release log.

Build & scope

Engine identity and declared limitations.

Tool: fspl
Engine: fspl
Engine build: 2026-09-13
Evidence core: 2026-09-13T01:10:14.255Z
Rendered: 2026-11-10T05:18:41.726Z
Last reviewed: 2026-08-08

Assumptions

Ideal free space; isotropic reference for FSPL.
c = 299792458 m/s.
Friis free-space equation assumes far-field propagation. For electrically large antennas or short separations, verify that the antenna separation exceeds the applicable far-field distance.

Limitations

Ideal free-space only — no atmosphere, multipath, or cable loss
d_m/f_Hz ≤ 0 → VALUE_MUST_BE_POSITIVE

Sources

Standards and references supporting this tool specification. Methods are listed separately — they are algorithms, not bibliographic sources.

Friis transmission equation — Free-space path loss form
Supports: FSPL from distance and wavelength/frequency
ITU-R P.525-5 (11/2024), Calculation of free-space attenuation — Free-space basic transmission loss
Supports: Standard FSPL formulation for radio links; version-locked recommendation

Verification disclosure

Aggregate outcomes, scope and artifact commitments are public. Complete test inputs, expected values, execution records and oracle infrastructure are retained privately. This summary does not independently reproduce the full verification run.