{
 "generated_utc": "2026-08-03T23:27:39Z",
 "gfs_cycle_utc": "2026-08-03T18:00:00Z",
 "model": {
  "source": "NCEP GFS 0.50 degree",
  "vertical_coordinate": "constant density (isopycnic)",
  "horizon_hours": 494.5,
  "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_20260803_18Z.csv.gz",
  "trajectories_geojson_gz": "PBA_forecast_20260803_18Z.geojson.gz"
 },
 "counts": {
  "flights": 38,
  "members": 9,
  "rows": 193662
 },
 "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": 1.61,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-10 21:15:00",
    "lat": -53.04777,
    "lon": 171.37853,
    "alt_m": 12962.6
   },
   "member_spread_deg": {
    "lat": 17.77,
    "lon": 347.62
   },
   "member_spread_now_deg": {
    "lat": 0.16,
    "lon": 0.23
   },
   "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": 245.67,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-10 17:45:00",
    "lat": 64.22565,
    "lon": -123.00868,
    "alt_m": 13070.8
   },
   "member_spread_deg": {
    "lat": 50.59,
    "lon": 157.11
   },
   "member_spread_now_deg": {
    "lat": 31.65,
    "lon": 333.77
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "BSS53",
   "flight_id": "BSS53_2026-03-09",
   "payload_type": "WSPR",
   "seed_time": "2026-08-03 22:15:18",
   "seed_lat": 77.58333,
   "seed_lon": 176.20833,
   "seed_alt_m": 12330.0,
   "seed_age_h": 1.08,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-10 21:45:00",
    "lat": 58.64573,
    "lon": -21.85133,
    "alt_m": 12781.1
   },
   "member_spread_deg": {
    "lat": 38.24,
    "lon": 71.79
   },
   "member_spread_now_deg": {
    "lat": 0.23,
    "lon": 359.64
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "BSS54",
   "flight_id": "BSS54_2026-07-09",
   "payload_type": "WSPR",
   "seed_time": "2026-08-03 18:59:49",
   "seed_lat": 28.125,
   "seed_lon": -33.70833,
   "seed_alt_m": 14500.0,
   "seed_age_h": 4.34,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-10 18:30:00",
    "lat": 43.07762,
    "lon": 107.74119,
    "alt_m": 14164.0
   },
   "member_spread_deg": {
    "lat": 14.12,
    "lon": 94.76
   },
   "member_spread_now_deg": {
    "lat": 2.0,
    "lon": 3.06
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-23",
   "flight_id": "DG2GG-23_2026-05-23",
   "payload_type": "WSPR",
   "seed_time": "2026-08-03 21:59:00",
   "seed_lat": 29.04167,
   "seed_lon": -171.875,
   "seed_alt_m": 13130.0,
   "seed_age_h": 1.35,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-10 21:30:00",
    "lat": 46.79421,
    "lon": -53.27888,
    "alt_m": 13077.7
   },
   "member_spread_deg": {
    "lat": 22.81,
    "lon": 85.48
   },
   "member_spread_now_deg": {
    "lat": 0.09,
    "lon": 0.67
   },
   "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": 231.97,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-10 17:45:00",
    "lat": 68.86839,
    "lon": 39.68695,
    "alt_m": 12580.2
   },
   "member_spread_deg": {
    "lat": 23.21,
    "lon": 276.58
   },
   "member_spread_now_deg": {
    "lat": 32.37,
    "lon": 199.64
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DG2GG-27",
   "flight_id": "DG2GG-27_2026-07-04",
   "payload_type": "WSPR",
   "seed_time": "2026-08-03 22:45:30",
   "seed_lat": 24.45833,
   "seed_lon": -146.91667,
   "seed_alt_m": 13780.0,
   "seed_age_h": 0.58,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-10 22:15:00",
    "lat": 12.86643,
    "lon": -118.40017,
    "alt_m": 13941.7
   },
   "member_spread_deg": {
    "lat": 45.74,
    "lon": 106.4
   },
   "member_spread_now_deg": {
    "lat": 0.06,
    "lon": 0.31
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-29",
   "flight_id": "DG2GG-29_2026-07-28",
   "payload_type": "WSPR",
   "seed_time": "2026-08-03 22:57:00",
   "seed_lat": 42.9375,
   "seed_lon": 157.20833,
   "seed_alt_m": 13300.0,
   "seed_age_h": 0.38,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-10 23:00:00",
    "lat": 48.80828,
    "lon": -58.466,
    "alt_m": 13234.1
   },
   "member_spread_deg": {
    "lat": 31.42,
    "lon": 149.91
   },
   "member_spread_now_deg": {
    "lat": 0.64,
    "lon": 0.33
   },
   "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": 152.65,
   "float_reliable": false,
   "dead_reckoned": true,
   "levels_spanned": 4,
   "nominal_end": {
    "valid_time": "2026-08-10 17:45:00",
    "lat": 38.29012,
    "lon": 55.98391,
    "alt_m": 9155.0
   },
   "member_spread_deg": {
    "lat": 34.4,
    "lon": 138.31
   },
   "member_spread_now_deg": {
    "lat": 45.73,
    "lon": 127.26
   },
   "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": 223.35,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 4,
   "nominal_end": {
    "valid_time": "2026-08-10 17:30:00",
    "lat": 62.95181,
    "lon": -97.37624,
    "alt_m": 8700.3
   },
   "member_spread_deg": {
    "lat": 42.83,
    "lon": 357.15
   },
   "member_spread_now_deg": {
    "lat": 27.33,
    "lon": 297.83
   },
   "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": 135.73,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-10 17:30:00",
    "lat": 53.20372,
    "lon": -22.3966,
    "alt_m": 12344.1
   },
   "member_spread_deg": {
    "lat": 28.22,
    "lon": 207.76
   },
   "member_spread_now_deg": {
    "lat": 26.3,
    "lon": 339.86
   },
   "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": 135.88,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-10 17:30:00",
    "lat": 29.98315,
    "lon": -85.02109,
    "alt_m": 12784.5
   },
   "member_spread_deg": {
    "lat": 33.88,
    "lon": 160.77
   },
   "member_spread_now_deg": {
    "lat": 16.98,
    "lon": 355.7
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DN3LEO-13",
   "flight_id": "DN3LEO-13_2026-04-12",
   "payload_type": "WSPR",
   "seed_time": "2026-08-03 10:18:00",
   "seed_lat": 61.10417,
   "seed_lon": 103.33333,
   "seed_alt_m": 12370.0,
   "seed_age_h": 13.03,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-10 17:45:00",
    "lat": 59.15529,
    "lon": 7.25229,
    "alt_m": 11940.2
   },
   "member_spread_deg": {
    "lat": 42.72,
    "lon": 356.07
   },
   "member_spread_now_deg": {
    "lat": 4.13,
    "lon": 4.63
   },
   "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": 251.07,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-10 17:45:00",
    "lat": 70.46215,
    "lon": -79.58936,
    "alt_m": 14978.6
   },
   "member_spread_deg": {
    "lat": 37.51,
    "lon": 336.65
   },
   "member_spread_now_deg": {
    "lat": 27.89,
    "lon": 276.94
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "EI6BFW-18",
   "flight_id": "EI6BFW-18_2026-07-25",
   "payload_type": "WSPR",
   "seed_time": "2026-08-03 22:28:00",
   "seed_lat": 60.64583,
   "seed_lon": -161.125,
   "seed_alt_m": 12730.0,
   "seed_age_h": 0.87,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-10 22:00:00",
    "lat": 34.25607,
    "lon": -98.11354,
    "alt_m": 13455.7
   },
   "member_spread_deg": {
    "lat": 43.14,
    "lon": 148.38
   },
   "member_spread_now_deg": {
    "lat": 0.57,
    "lon": 0.45
   },
   "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": 275.08,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-10 17:45:00",
    "lat": 47.08553,
    "lon": -120.50327,
    "alt_m": 14010.4
   },
   "member_spread_deg": {
    "lat": 95.08,
    "lon": 318.23
   },
   "member_spread_now_deg": {
    "lat": 38.93,
    "lon": 344.49
   },
   "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": 9.16,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-10 17:45:00",
    "lat": 50.37864,
    "lon": -136.07375,
    "alt_m": 12946.7
   },
   "member_spread_deg": {
    "lat": 53.06,
    "lon": 343.31
   },
   "member_spread_now_deg": {
    "lat": 0.73,
    "lon": 3.46
   },
   "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": 184.9,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-10 17:30:00",
    "lat": 40.80252,
    "lon": 179.0454,
    "alt_m": 13102.1
   },
   "member_spread_deg": {
    "lat": 62.43,
    "lon": 348.07
   },
   "member_spread_now_deg": {
    "lat": 58.67,
    "lon": 295.76
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "KC3LBR-449",
   "flight_id": "KC3LBR-449_2026-07-06",
   "payload_type": "WSPR",
   "seed_time": "2026-08-03 22:52:33",
   "seed_lat": 58.20833,
   "seed_lon": -114.08333,
   "seed_alt_m": 13293.0,
   "seed_age_h": 0.46,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-10 23:00:00",
    "lat": 60.39173,
    "lon": -14.23078,
    "alt_m": 13501.5
   },
   "member_spread_deg": {
    "lat": 18.86,
    "lon": 35.05
   },
   "member_spread_now_deg": {
    "lat": 0.12,
    "lon": 0.1
   },
   "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": 158.2,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-10 17:45:00",
    "lat": 59.33004,
    "lon": -174.66379,
    "alt_m": 13044.3
   },
   "member_spread_deg": {
    "lat": 33.23,
    "lon": 344.9
   },
   "member_spread_now_deg": {
    "lat": 13.94,
    "lon": 241.61
   },
   "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": 35.82,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-10 17:30:00",
    "lat": 64.80559,
    "lon": 63.35345,
    "alt_m": 12441.2
   },
   "member_spread_deg": {
    "lat": 30.01,
    "lon": 344.87
   },
   "member_spread_now_deg": {
    "lat": 7.12,
    "lon": 25.19
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "KD7FXO-1",
   "flight_id": "KD7FXO-1_2026-08-02",
   "payload_type": "WSPR",
   "seed_time": "2026-08-03 22:55:00",
   "seed_lat": 36.27083,
   "seed_lon": -152.08333,
   "seed_alt_m": 12850.0,
   "seed_age_h": 0.42,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-10 23:00:00",
    "lat": 59.50378,
    "lon": 59.41025,
    "alt_m": 12680.3
   },
   "member_spread_deg": {
    "lat": 32.11,
    "lon": 209.97
   },
   "member_spread_now_deg": {
    "lat": 0.04,
    "lon": 0.08
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "KE8RES-8",
   "flight_id": "KE8RES-8_2026-06-20",
   "payload_type": "WSPR",
   "seed_time": "2026-08-03 22:31:00",
   "seed_lat": 52.6875,
   "seed_lon": -109.0,
   "seed_alt_m": 12260.0,
   "seed_age_h": 0.82,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-10 22:00:00",
    "lat": 49.18763,
    "lon": -38.30548,
    "alt_m": 12606.1
   },
   "member_spread_deg": {
    "lat": 12.51,
    "lon": 61.73
   },
   "member_spread_now_deg": {
    "lat": 0.24,
    "lon": 0.08
   },
   "display_as": "track",
   "display_reason": "fresh"
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   "seed_time": "2026-08-03 18:46:00",
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  },
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   "flight_id": "KI1TEN-1_2026-07-23",
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   "seed_time": "2026-08-01 22:55:27",
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  },
  {
   "callsign": "KI6DS-11",
   "flight_id": "KI6DS-11_2026-02-03",
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   "seed_time": "2026-08-03 21:35:45",
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  },
  {
   "callsign": "N0MPM-31",
   "flight_id": "N0MPM-31_2026-04-16",
   "payload_type": "WSPR",
   "seed_time": "2026-07-21 23:53:19",
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  },
  {
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  },
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   "display_as": "region",
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  },
  {
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   "flight_id": "SP2ROC-1_2026-03-14",
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   "seed_time": "2026-07-22 14:00:27",
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   "display_as": "region",
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  },
  {
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   "flight_id": "SP2ROC-41_2026-01-25",
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   "display_as": "track",
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  },
  {
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   "seed_time": "2026-07-21 03:17:00",
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   "display_as": "region",
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  {
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  },
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  },
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  },
  {
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  },
  {
   "callsign": "ZS6SRC-37",
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   "seed_time": "2026-07-31 04:34:00",
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  {
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   "payload_type": "WSPR",
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  }
 ]
}