electrical.rf.antenna_length

Three distinct suites: educational examples on the calculator page, this legacy regression count (28/28 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 1.0.3 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 1.0.3. CVP 1.0.0-proposed. 4/4 golden · 9/9 CVP boundary · 9/9 invalid · 13/13 property · 2/2 metamorphic · 10/10 O3 · 5/5 cross-interface · 6/6 CVP contract. digest 053a5d12c9c6. ≤2 ULP vs O3 applies only to the published tabulated vectors (half, quarter, wavelength/full alias, k≠1, HF/VHF/UHF/LF). It is not a whole-domain antenna-model guarantee.

• Golden (oracle-backed) 4 / 4
• CVP boundary 9 / 9
• Invalid input 9 / 9
• Property 13 / 13
• Metamorphic 2 / 2
• O3 high-precision 10 / 10
• Cross-interface 5 / 5
• CVP contract 6 / 6
• Interfaces PASS · UI (SSR) / REST / MCP
• Interface claim ui-ssr is query-result HTML, not a live browser session. Error-path engine·REST·MCP 1/1 (status, code, calculation_version). SSR compared on URL-canonical requested calculations; empty query is idle (not an error) and JSON-typed object/array inputs are REST/MCP-only.
• 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:fc89c239085f6e1a743b3d35d8b7e8fdeafe47ae9c4f6238ce467904272f741d

Input schema sha256:75b65082e2c05ac7dbf5c781b5ff86c212308cf737ff4a604ac9cac9ac8f98e1 · Output schema sha256:ff32ffc407c1a9cc313e7e4d0ad861649ee2505fe640584d39ae92091a39b93c · 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.

Tool

antenna-length

Engine

antenna-length

Engine build

2026-09-10

Evidence core

2026-09-05T07:47:40.374Z

Rendered

2026-11-10T05:18:41.751Z

Last reviewed

2026-09-05

Assumptions

• Straight idealized antenna element.
• Frequency is the intended resonant/design frequency.
• No loading coils or distributed reactive loading.
• No explicit ground, nearby-object, conductor-diameter, or end-effect model.
• Correction factor k is a scalar length adjustment, not a transmission-line velocity factor.
• Quarter-wave mode is the ideal monopole radiator length over a perfect image plane / ground plane (≈ λ₀/4); radials and real soil are not modeled.
• Wavelength mode returns L = k·λ₀ (corrected 1λ), which equals free-space λ₀ only when k=1.
• S = k·λ₀ is a corrected design length scale, not a physical EM wavelength in a medium.

Limitations

• Not a full antenna model — no ground, diameter, end-effect, loading coils, or NEC geometry.