Source: https://guthlabs.ai/docs/instruments/antenna-length-calculator-dipole-monopole-whip/implementation/

instrument implementation / implementation-contract

# Antenna Length Calculator (dipole/monopole/whip) implementation

A source-bound implementation contract for Antenna Length Calculator (dipole/monopole/whip); deployment and executable qualification remain separate.

Status: **VERIFIED_CLEAN**Lifecycle: **implementation-contract**

## Binding contract

This record describes what an executable surface must bind and validate. It does not claim that a public calculator, package, or production route is deployed.

**Record owner**: Guth Instruments

**Lifecycle**: verified-clean

**Evidence ID**: t5-050

**Effect**: Computation or source lookup only

## Input and validation requirements

Zero frequency produces undefined wavelength and antenna length, requiring rejection. Negative frequency also exposes an unresolved sign convention: literal arithmetic returns negative physical lengths, while a magnitude convention returns positive lengths.

## Required corrections

No binding erratum is attached to this unique-name record. Implementers must still preserve the declared units, domain, and failure behavior.

## Inspectable interface fixture

The sample below is evidence for interface and validation tests, not a production implementation.

````
{
  "inputs": {
    "frequency": 14.2,
    "frequency_unit": "MHz",
    "antenna_type": "dipole",
    "velocity_factor": 0.95
  },
  "expected_outputs": {
    "wavelength_m": 21.11214493,
    "total_length_ft": 32.95774648,
    "per_element_length_ft": 16.47887324
  },
  "working": "Convert frequency: 14.2 MHz = 14,200,000 Hz. Wavelength = 299,792,458 / 14,200,000 = 21.11214493 m. Dipole total = 468 / 14.2 = 32.95774648 ft. Each half = 32.95774648 / 2 = 16.47887324 ft."
}
````

## Other records

[01**Overview**](<https://guthlabs.ai/docs/instruments/antenna-length-calculator-dipole-monopole-whip/>)[02**Mechanism**](<https://guthlabs.ai/docs/instruments/antenna-length-calculator-dipole-monopole-whip/mechanism/>)[04**Qualification**](<https://guthlabs.ai/docs/instruments/antenna-length-calculator-dipole-monopole-whip/qualification/>)

## Sources and evidence

These pointers bind the page to evidence. They do not grant authority or collapse verification into deployment.

- `VERIFIED_LEDGER.json`

- `evidence-tranche5/tranche5-results.json`