{
 "generated_utc": "2026-08-04T11:27:36Z",
 "gfs_cycle_utc": "2026-08-04T06:00:00Z",
 "model": {
  "source": "NCEP GFS 0.50 degree",
  "vertical_coordinate": "constant density (isopycnic)",
  "horizon_hours": 485.5,
  "output_interval_min": 30,
  "integration_step_s": 900,
  "wind_field_interval_h": 3
 },
 "staleness": {
  "fresh_seed_max_h": 24.0,
  "served_until_h": 336.0,
  "track_max_age_h": 72.0,
  "region_spread_deg": 60.0,
  "note": "A trajectory is served for 336 h after the last real fix and then the flight disappears. That matches the archive's own bridging limit: 23% of flights go quiet for over a week and are then heard again, so a shorter window drops balloons that are still flying. Past dead_reckoned flights the balloon has not been heard from since seed_time, so its present position is a prediction too -- the silent period is reconstructed from GFS analyses of weather that has already happened, which is why wind_source distinguishes analysis from forecast. Use display_as, not seed_age_h, to decide how to draw a flight: 'track' means the members still agree and a line is meaningful, 'region' means draw the member envelope instead because the nominal member is no better than any other."
 },
 "members": {
  "offsets_m": [
   -2000,
   -1500,
   -1000,
   -500,
   0,
   500,
   1000,
   1500,
   2000
  ],
  "nominal_offset_m": 0,
  "note": "Each member is seeded at the last observed altitude plus its offset and then conserves the density it started with. The ladder is a sensitivity fan, not a probability distribution: adjacent members diverge by roughly 1,200 km over seven days. levels_spanned reports how many GFS levels the fan actually straddles, usually 2 or 3."
 },
 "files": {
  "trajectories_csv_gz": "PBA_forecast_20260804_06Z.csv.gz",
  "trajectories_geojson_gz": "PBA_forecast_20260804_06Z.geojson.gz"
 },
 "counts": {
  "flights": 37,
  "members": 9,
  "rows": 183879
 },
 "flights": [
  {
   "callsign": "AG6NS-23",
   "flight_id": "AG6NS-23_2026-02-07",
   "payload_type": "WSPR",
   "seed_time": "2026-08-03 21:43:40",
   "seed_lat": -43.64584,
   "seed_lon": -84.62499,
   "seed_alt_m": 12360.0,
   "seed_age_h": 13.61,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-11 05:45:00",
    "lat": -53.30038,
    "lon": 178.96722,
    "alt_m": 12818.2
   },
   "member_spread_deg": {
    "lat": 17.61,
    "lon": 358.84
   },
   "member_spread_now_deg": {
    "lat": 2.67,
    "lon": 3.16
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS52",
   "flight_id": "BSS52_2025-12-25",
   "payload_type": "WSPR",
   "seed_time": "2026-07-24 17:39:48",
   "seed_lat": 59.97917,
   "seed_lon": 4.08333,
   "seed_alt_m": 13000.0,
   "seed_age_h": 257.67,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-11 05:45:00",
    "lat": 66.42409,
    "lon": -122.65855,
    "alt_m": 13051.8
   },
   "member_spread_deg": {
    "lat": 29.27,
    "lon": 154.9
   },
   "member_spread_now_deg": {
    "lat": 32.91,
    "lon": 339.01
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "BSS53",
   "flight_id": "BSS53_2026-03-09",
   "payload_type": "WSPR",
   "seed_time": "2026-08-04 07:40:19",
   "seed_lat": 79.79167,
   "seed_lon": -155.16667,
   "seed_alt_m": 12420.0,
   "seed_age_h": 3.66,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-11 07:15:00",
    "lat": 40.33244,
    "lon": -1.28261,
    "alt_m": 13044.4
   },
   "member_spread_deg": {
    "lat": 39.91,
    "lon": 146.5
   },
   "member_spread_now_deg": {
    "lat": 1.14,
    "lon": 7.12
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS54",
   "flight_id": "BSS54_2026-07-09",
   "payload_type": "WSPR",
   "seed_time": "2026-08-04 10:25:19",
   "seed_lat": 36.9375,
   "seed_lon": -22.54167,
   "seed_alt_m": 14320.0,
   "seed_age_h": 0.91,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-11 10:00:00",
    "lat": 54.08204,
    "lon": 116.89123,
    "alt_m": 14110.7
   },
   "member_spread_deg": {
    "lat": 22.92,
    "lon": 39.09
   },
   "member_spread_now_deg": {
    "lat": 0.32,
    "lon": 0.28
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-23",
   "flight_id": "DG2GG-23_2026-05-23",
   "payload_type": "WSPR",
   "seed_time": "2026-08-04 04:01:30",
   "seed_lat": 28.33333,
   "seed_lon": -171.70833,
   "seed_alt_m": 13070.0,
   "seed_age_h": 7.31,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-11 05:30:00",
    "lat": 38.18414,
    "lon": -61.77984,
    "alt_m": 13154.6
   },
   "member_spread_deg": {
    "lat": 16.75,
    "lon": 77.26
   },
   "member_spread_now_deg": {
    "lat": 0.66,
    "lon": 3.41
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-25",
   "flight_id": "DG2GG-25_2026-06-15",
   "payload_type": "WSPR",
   "seed_time": "2026-07-25 07:22:00",
   "seed_lat": 68.97917,
   "seed_lon": 68.16667,
   "seed_alt_m": 12990.0,
   "seed_age_h": 243.97,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-11 05:45:00",
    "lat": 68.83835,
    "lon": 50.12961,
    "alt_m": 12541.0
   },
   "member_spread_deg": {
    "lat": 35.2,
    "lon": 284.86
   },
   "member_spread_now_deg": {
    "lat": 44.87,
    "lon": 205.98
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DG2GG-27",
   "flight_id": "DG2GG-27_2026-07-04",
   "payload_type": "WSPR",
   "seed_time": "2026-08-04 01:23:00",
   "seed_lat": 24.875,
   "seed_lon": -146.33333,
   "seed_alt_m": 13840.0,
   "seed_age_h": 9.95,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-11 05:30:00",
    "lat": 21.13648,
    "lon": -122.56513,
    "alt_m": 13927.1
   },
   "member_spread_deg": {
    "lat": 39.33,
    "lon": 62.33
   },
   "member_spread_now_deg": {
    "lat": 2.95,
    "lon": 4.29
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-29",
   "flight_id": "DG2GG-29_2026-07-28",
   "payload_type": "WSPR",
   "seed_time": "2026-08-04 04:57:00",
   "seed_lat": 46.91667,
   "seed_lon": 165.25,
   "seed_alt_m": 13380.0,
   "seed_age_h": 6.38,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-11 05:30:00",
    "lat": 25.57154,
    "lon": -134.58986,
    "alt_m": 13565.5
   },
   "member_spread_deg": {
    "lat": 22.32,
    "lon": 85.68
   },
   "member_spread_now_deg": {
    "lat": 2.07,
    "lon": 8.97
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DJ2DS-34",
   "flight_id": "DJ2DS-34_2026-04-22",
   "payload_type": "WSPR",
   "seed_time": "2026-07-28 14:41:00",
   "seed_lat": 30.70833,
   "seed_lon": -70.5,
   "seed_alt_m": 9190.0,
   "seed_age_h": 164.65,
   "float_reliable": false,
   "dead_reckoned": true,
   "levels_spanned": 4,
   "nominal_end": {
    "valid_time": "2026-08-11 05:45:00",
    "lat": 32.75103,
    "lon": 61.2786,
    "alt_m": 9138.5
   },
   "member_spread_deg": {
    "lat": 47.49,
    "lon": 231.5
   },
   "member_spread_now_deg": {
    "lat": 40.47,
    "lon": 133.49
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DL0MMZ",
   "flight_id": "DL0MMZ_2026-07-24",
   "payload_type": "OTHER",
   "seed_time": "2026-07-25 15:59:04",
   "seed_lat": 36.60802,
   "seed_lon": 30.46457,
   "seed_alt_m": 8441.0,
   "seed_age_h": 235.35,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 4,
   "nominal_end": {
    "valid_time": "2026-08-11 05:30:00",
    "lat": 41.88461,
    "lon": -29.07632,
    "alt_m": 8564.1
   },
   "member_spread_deg": {
    "lat": 31.93,
    "lon": 295.37
   },
   "member_spread_now_deg": {
    "lat": 27.34,
    "lon": 303.52
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DL0MZ-493",
   "flight_id": "DL0MZ-493_2026-07-25",
   "payload_type": "WSPR",
   "seed_time": "2026-07-29 07:36:01",
   "seed_lat": 64.20833,
   "seed_lon": 58.16667,
   "seed_alt_m": 12170.0,
   "seed_age_h": 147.73,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-11 05:30:00",
    "lat": 64.81831,
    "lon": 68.78083,
    "alt_m": 12188.7
   },
   "member_spread_deg": {
    "lat": 30.41,
    "lon": 279.79
   },
   "member_spread_now_deg": {
    "lat": 36.35,
    "lon": 340.58
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DL0MZ-493e",
   "flight_id": "DL0MZ-493e_2026-07-25",
   "payload_type": "WSPR",
   "seed_time": "2026-07-29 07:27:02",
   "seed_lat": 64.15625,
   "seed_lon": 58.08889,
   "seed_alt_m": 12170.0,
   "seed_age_h": 147.88,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-11 05:30:00",
    "lat": 65.12469,
    "lon": 68.69751,
    "alt_m": 12188.6
   },
   "member_spread_deg": {
    "lat": 31.18,
    "lon": 190.14
   },
   "member_spread_now_deg": {
    "lat": 35.23,
    "lon": 348.31
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DN3LEO-13",
   "flight_id": "DN3LEO-13_2026-04-12",
   "payload_type": "WSPR",
   "seed_time": "2026-08-04 09:18:00",
   "seed_lat": 59.58333,
   "seed_lon": 131.5,
   "seed_alt_m": 12210.0,
   "seed_age_h": 2.03,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-11 08:45:00",
    "lat": 61.3141,
    "lon": 39.71858,
    "alt_m": 12143.1
   },
   "member_spread_deg": {
    "lat": 28.48,
    "lon": 199.14
   },
   "member_spread_now_deg": {
    "lat": 0.32,
    "lon": 0.69
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DO3GU-40",
   "flight_id": "DO3GU-40_2026-06-19",
   "payload_type": "WSPR",
   "seed_time": "2026-07-24 12:15:47",
   "seed_lat": 71.20833,
   "seed_lon": 93.16667,
   "seed_alt_m": 15164.0,
   "seed_age_h": 263.07,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-11 05:45:00",
    "lat": 71.69467,
    "lon": -66.23956,
    "alt_m": 15036.0
   },
   "member_spread_deg": {
    "lat": 25.25,
    "lon": 341.31
   },
   "member_spread_now_deg": {
    "lat": 23.29,
    "lon": 290.36
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "EI6BFW-18",
   "flight_id": "EI6BFW-18_2026-07-25",
   "payload_type": "WSPR",
   "seed_time": "2026-08-04 04:03:00",
   "seed_lat": 64.5625,
   "seed_lon": -157.70833,
   "seed_alt_m": 12700.0,
   "seed_age_h": 7.28,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-11 05:30:00",
    "lat": 31.13978,
    "lon": -79.3668,
    "alt_m": 13560.1
   },
   "member_spread_deg": {
    "lat": 34.48,
    "lon": 172.42
   },
   "member_spread_now_deg": {
    "lat": 2.83,
    "lon": 15.15
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "K0PEA-28",
   "flight_id": "K0PEA-28_2026-01-07",
   "payload_type": "WSPR",
   "seed_time": "2026-07-23 12:15:25",
   "seed_lat": 49.85411,
   "seed_lon": 24.91668,
   "seed_alt_m": 13360.0,
   "seed_age_h": 287.08,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-11 05:45:00",
    "lat": 52.40296,
    "lon": -58.94283,
    "alt_m": 13467.1
   },
   "member_spread_deg": {
    "lat": 83.38,
    "lon": 263.59
   },
   "member_spread_now_deg": {
    "lat": 36.05,
    "lon": 244.17
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "K5NOT-11",
   "flight_id": "K5NOT-11_2026-06-20",
   "payload_type": "WSPR",
   "seed_time": "2026-08-03 14:10:37",
   "seed_lat": 43.77078,
   "seed_lon": 25.08333,
   "seed_alt_m": 13060.0,
   "seed_age_h": 21.16,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-11 05:45:00",
    "lat": 21.09614,
    "lon": -153.40661,
    "alt_m": 13547.0
   },
   "member_spread_deg": {
    "lat": 65.47,
    "lon": 313.72
   },
   "member_spread_now_deg": {
    "lat": 3.84,
    "lon": 7.81
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "K9YO-23",
   "flight_id": "K9YO-23_2026-07-13",
   "payload_type": "WSPR",
   "seed_time": "2026-07-27 06:25:49",
   "seed_lat": 52.5833,
   "seed_lon": 125.16663,
   "seed_alt_m": 12840.0,
   "seed_age_h": 196.9,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-11 05:30:00",
    "lat": 16.38512,
    "lon": -158.50968,
    "alt_m": 13267.2
   },
   "member_spread_deg": {
    "lat": 52.35,
    "lon": 349.94
   },
   "member_spread_now_deg": {
    "lat": 66.9,
    "lon": 309.57
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "KC3LBR-449",
   "flight_id": "KC3LBR-449_2026-07-06",
   "payload_type": "WSPR",
   "seed_time": "2026-08-04 03:40:33",
   "seed_lat": 57.0,
   "seed_lon": -112.875,
   "seed_alt_m": 13280.0,
   "seed_age_h": 7.66,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-11 05:45:00",
    "lat": 58.98789,
    "lon": -6.65521,
    "alt_m": 13354.5
   },
   "member_spread_deg": {
    "lat": 29.54,
    "lon": 85.36
   },
   "member_spread_now_deg": {
    "lat": 2.26,
    "lon": 1.43
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "KC3LBR-485",
   "flight_id": "KC3LBR-485_2026-03-19",
   "payload_type": "WSPR",
   "seed_time": "2026-07-28 09:08:18",
   "seed_lat": 50.14583,
   "seed_lon": 23.375,
   "seed_alt_m": 12850.0,
   "seed_age_h": 170.2,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-11 05:45:00",
    "lat": 43.41283,
    "lon": -169.01154,
    "alt_m": 13150.9
   },
   "member_spread_deg": {
    "lat": 37.3,
    "lon": 357.76
   },
   "member_spread_now_deg": {
    "lat": 20.67,
    "lon": 235.82
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "KC5TRB-1",
   "flight_id": "KC5TRB-1_2026-06-20",
   "payload_type": "WSPR",
   "seed_time": "2026-08-02 11:30:43",
   "seed_lat": 67.33328,
   "seed_lon": 65.58336,
   "seed_alt_m": 12840.0,
   "seed_age_h": 47.82,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-11 05:30:00",
    "lat": 64.26514,
    "lon": 43.79464,
    "alt_m": 12286.9
   },
   "member_spread_deg": {
    "lat": 40.96,
    "lon": 211.14
   },
   "member_spread_now_deg": {
    "lat": 8.78,
    "lon": 29.28
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "KD7FXO-1",
   "flight_id": "KD7FXO-1_2026-08-02",
   "payload_type": "WSPR",
   "seed_time": "2026-08-04 04:00:00",
   "seed_lat": 37.02083,
   "seed_lon": -150.04167,
   "seed_alt_m": 12800.0,
   "seed_age_h": 7.33,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-11 05:30:00",
    "lat": 53.64751,
    "lon": 65.70239,
    "alt_m": 12611.1
   },
   "member_spread_deg": {
    "lat": 32.87,
    "lon": 190.8
   },
   "member_spread_now_deg": {
    "lat": 1.03,
    "lon": 1.07
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "KE8RES-8",
   "flight_id": "KE8RES-8_2026-06-20",
   "payload_type": "WSPR",
   "seed_time": "2026-08-03 23:36:00",
   "seed_lat": 52.47917,
   "seed_lon": -108.5,
   "seed_alt_m": 12260.0,
   "seed_age_h": 11.73,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-11 05:30:00",
    "lat": 58.03578,
    "lon": -93.2532,
    "alt_m": 12015.2
   },
   "member_spread_deg": {
    "lat": 4.29,
    "lon": 30.07
   },
   "member_spread_now_deg": {
    "lat": 1.26,
    "lon": 3.06
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
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  },
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  },
  {
   "callsign": "KI6DS-11",
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   "payload_type": "WSPR",
   "seed_time": "2026-08-04 05:55:45",
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  },
  {
   "callsign": "N0MPM-31",
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   "payload_type": "WSPR",
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   "display_as": "region",
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  },
  {
   "callsign": "PC4L-11",
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   "seed_time": "2026-07-26 12:46:26",
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  },
  {
   "callsign": "SP0LND-6",
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   "payload_type": "APRS",
   "seed_time": "2026-07-26 13:19:17",
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   "nominal_end": {
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   "display_as": "region",
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  },
  {
   "callsign": "SP2ROC-1",
   "flight_id": "SP2ROC-1_2026-03-14",
   "payload_type": "APRS",
   "seed_time": "2026-07-22 14:00:27",
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   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "SP2ROC-41",
   "flight_id": "SP2ROC-41_2026-01-25",
   "payload_type": "WSPR",
   "seed_time": "2026-08-04 09:51:00",
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   "nominal_end": {
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  },
  {
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   "display_as": "region",
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  {
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  },
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  },
  {
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   "display_as": "region",
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  },
  {
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   "payload_type": "WSPR",
   "seed_time": "2026-07-31 04:34:00",
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  },
  {
   "callsign": "ZS6SRC-84",
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   "payload_type": "WSPR",
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  }
 ]
}