Coax Cable Loss & Power Handling Estimator implementation

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

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