Source: https://guthlabs.ai/docs/instruments/coax-cable-loss-power-handling-estimator/implementation/

instrument implementation / implementation-contract

# Coax Cable Loss & Power Handling Estimator implementation

A source-bound implementation contract for Coax Cable Loss & Power Handling Estimator; 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**: t7-084

**Effect**: Computation or source lookup only

## Input and validation requirements

The specification does not provide actual attenuation tables, valid frequency ranges, interpolation or extrapolation rules, explicit input units, or a defined response for out-of-domain frequencies. These omissions permit undefined results or materially different outputs, especially at zero frequency and when length or input power conventions are misread.

## 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": {
    "cable_type": "LMR-400",
    "length_ft": 100,
    "frequency_MHz": 150,
    "Pin_W": 10
  },
  "expected_outputs": {
    "total_loss_dB": 0.9,
    "Pout_W": 8.128305,
    "efficiency_percent": 81.28305
  },
  "reference_data": {
    "LMR-400_attenuation_dB_per_100ft_at_150MHz": 0.9,
    "source_convention": "widely tabulated standard value; Times Microwave Systems LMR-400 manufacturer attenuation-maximum table"
  },
  "working": "The lookup is exactly at the 150 MHz table row: attenuation = 0.9 dB/100 ft. length factor = 100/100 = 1. Total loss = 0.9 × 1 = 0.9 dB. Power ratio = 10^(-0.9/10) = 10^(-0.09) = 0.8128305. Pout = 10 W × 0.8128305 = 8.128305 W. Efficiency = 100 × 0.8128305 = 81.28305%."
}
````

## Other records

[01**Overview**](<https://guthlabs.ai/docs/instruments/coax-cable-loss-power-handling-estimator/>)[02**Mechanism**](<https://guthlabs.ai/docs/instruments/coax-cable-loss-power-handling-estimator/mechanism/>)[04**Qualification**](<https://guthlabs.ai/docs/instruments/coax-cable-loss-power-handling-estimator/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-tranche7/tranche7-results.json`