# Ham Radio Calculator Suite

Ham Radio Calculator Suite provides field-ready calculators, reference tools, and blog articles for amateur radio operators.

Use the human site for interactive calculators:
- English: /en
- Simplified Chinese: /zh-CN
- Traditional Chinese: /zh-TW
- German: /de
- Spanish: /es
- French: /fr
- Italian: /it
- Japanese: /ja

Machine-readable API:
- GET /api/tools
- POST /api/calculate

POST /api/calculate JSON body:
```json
{
  "tool": "wavelength",
  "inputs": {
    "frequencyMHz": 14.2,
    "velocityFactor": 0.95
  }
}
```

Initial API tools:
- wavelength: frequencyMHz, velocityFactor
- dipole: frequencyMHz, shorteningFactor
- fspl: frequencyMHz, distanceKm
- erp: transmitterPowerW, lineLossDb, antennaGainDbd

Interactive calculator index:
- Antennas: /en/dipole, /en/yagi, /en/j-pole, /en/gp, /en/magloop, /en/quad-loop, /en/delta-loop, /en/hexbeam, /en/efhw, /en/moxon, /en/log-periodic, /en/inverted-v, /en/sloper, /en/beverage, /en/loaded-element
- Circuits: /en/matching-network, /en/stub, /en/balun, /en/quarter-wave-transformer, /en/gamma-match, /en/hairpin-match, /en/inductor, /en/filter-designer, /en/transistor-bias, /en/noise-figure, /en/toroid-inductor, /en/lc-resonance, /en/op-amp, /en/timer-555, /en/attenuator-pad, /en/smith-chart, /en/component-helpers
- Propagation: /en/erp, /en/rf-exposure, /en/fspl, /en/hf-map, /en/nvis, /en/voacap-helper, /en/gray-line, /en/aurora-indicator
- Operations and utilities: /en/grid-square, /en/power-planner, /en/digital-audio, /en/exam-practice, /en/qso-template, /en/morse-trainer, /en/contest-scorer, /en/wavelength, /en/swr, /en/coax-loss, /en/rf-power, /en/unit-conversion, /en/q-codes, /en/band-plan, /en/frequency-allocation, /en/prefix-index, /en/dxcc-prefix, /en/emergency-checklist

Blog index:
- /en/blog/001-how-to-build-dipole - How to Build and Tune a Dipole Antenna
- /en/blog/002-understanding-swr - Understanding Standing Wave Ratio (SWR)
- /en/blog/003-using-smith-chart-for-matching - Smith Chart Impedance Matching Guide

The same blog slugs are localized under /zh-CN/blog/, /zh-TW/blog/, /de/blog/, /es/blog/, /fr/blog/, /it/blog/, and /ja/blog/.