{
  "recording_id": "qpsk_hw_tx_capture_001",
  "description": "Lab 11.38 hardware QPSK TX capture for offline reference RX",
  "created_utc": "YYYY-MM-DDTHH:MM:SSZ",
  "operator": "",
  "hardware": {
    "tx_board": "ZynqSDR A / xc7z020 + AD936x",
    "tx_build_commit": "<git-commit-sha>",
    "rx_device": "ZynqSDR B or RTL-SDR",
    "rf_path": "coax + attenuator or OTA",
    "attenuation_db": null
  },
  "rf": {
    "tx_center_frequency_hz": 868100000,
    "rx_center_frequency_hz": 868100000,
    "tx_gain_db": null,
    "rx_gain_mode": "manual",
    "rx_gain_db": null,
    "rf_bandwidth_hz": null
  },
  "sampling": {
    "sample_rate_hz": 3840000,
    "sample_count": 0,
    "iq_format": "ci16",
    "endianness": "little",
    "i_first": true
  },
  "signal": {
    "modulation": "QPSK",
    "symbol_rate_hz": 480000,
    "samples_per_symbol_tx": 8,
    "frame_symbols": 140
  },
  "packet": {
    "format": "known-course-frame",
    "sequence": null,
    "expected_payload_utf8": null,
    "expected_prbs_seed": null
  },
  "quality_notes": {
    "clipping_observed": false,
    "overload_warning": false,
    "comments": ""
  }
}