{
  "contest": {
    "id": "cq-ww-rtty",
    "name": "CQ Worldwide DX Contest, RTTY",
    "sponsor": "CQ Magazine",
    "sponsor_home": "https://cqwwrtty.com/",
    "country": "US",
    "summary": "Worldwide RTTY contest working CQ zones, DXCC countries and, uniquely among the CQ WW family, W/VE states and provinces as a third multiplier.",
    "modes": [
      "RTTY"
    ],
    "bands": [
      "80m",
      "40m",
      "20m",
      "15m",
      "10m"
    ],
    "exchange": "RST report plus CQ zone number; continental USA and Canada also send state or province",
    "power_categories": [
      {
        "name": "High Power",
        "max_watts": 1500
      },
      {
        "name": "Low Power",
        "max_watts": 100
      },
      {
        "name": "QRP",
        "max_watts": 5
      }
    ],
    "log_format": "Cabrillo",
    "log_deadline_days": 2,
    "log_submit_url": "https://cqwwrtty.com/logs.htm",
    "timezone": "",
    "local_rolling": false,
    "eligibility": {
      "scope": "worldwide",
      "verified": true,
      "note": "CQ WW RTTY rules I: 'For amateurs around the world to contact as many other amateurs in as many CQ zones, countries and W/VE QTHs as possible.'"
    },
    "active_from": null,
    "active_until": null,
    "note": "",
    "verified": true,
    "rules_url": "https://cqwwrtty.com/rules.htm",
    "rules_url_pattern": "",
    "rules_url_archived": "",
    "rules_url_checked": "2026-08-16",
    "source_note": "cqwwrtty.com states the period ('Starts 00:00:00 UTC Saturday -- Ends 23:59:59 UTC Sunday') and the year's dates ('September 26-27') but no recurrence rule. Last full weekend of September reproduces all eleven CQ-published runnings 2016-2026, each read from that year's archived rules PDF on cqwwrtty.com, including 2018 (Sep 29-30, a fifth Saturday). Verified 2026-08-16."
  },
  "rule": {
    "plain": "Last full weekend of September",
    "raw": {
      "type": "nth_full_weekend",
      "month": 9,
      "n": -1
    },
    "start": {
      "day_offset": 0,
      "time": "0000"
    },
    "end": {
      "day_offset": 1,
      "time": "2359"
    },
    "sessions": null
  },
  "next": [
    {
      "contest_id": "cq-ww-rtty",
      "name": "CQ Worldwide DX Contest, RTTY",
      "start": "2027-09-25T00:00:00Z",
      "end": "2027-09-26T23:59:00Z",
      "start_wall": null,
      "end_wall": null,
      "local_rolling": false,
      "timezone": "",
      "duration_hours": 47.98,
      "modes": [
        "RTTY"
      ],
      "submodes": [],
      "bands": [
        "80m",
        "40m",
        "20m",
        "15m",
        "10m"
      ],
      "bands_note": "Five bands only: 3.5, 7, 14, 21 and 28 MHz",
      "sponsor": "CQ Magazine",
      "rules_url": "https://cqwwrtty.com/rules.htm",
      "verified": true,
      "note": "",
      "exchange": "RST report plus CQ zone number; continental USA and Canada also send state or province",
      "country": "US",
      "rules_url_archived": "",
      "rules_url_checked": "2026-08-16",
      "can_enter": true,
      "eligibility_scope": "worldwide",
      "eligibility_reason": "",
      "works": "everyone",
      "practical": "",
      "log_due": "2027-09-28T23:59:00Z",
      "uid": "cq-ww-rtty-20270925T0000@contestcal",
      "start_date": "2027-09-25",
      "mode_families": [
        "RTTY",
        "Digital"
      ],
      "band_families": [
        "80m",
        "40m",
        "20m",
        "15m",
        "10m"
      ],
      "duration_bucket": "gte24"
    },
    {
      "contest_id": "cq-ww-rtty",
      "name": "CQ Worldwide DX Contest, RTTY",
      "start": "2028-09-23T00:00:00Z",
      "end": "2028-09-24T23:59:00Z",
      "start_wall": null,
      "end_wall": null,
      "local_rolling": false,
      "timezone": "",
      "duration_hours": 47.98,
      "modes": [
        "RTTY"
      ],
      "submodes": [],
      "bands": [
        "80m",
        "40m",
        "20m",
        "15m",
        "10m"
      ],
      "bands_note": "Five bands only: 3.5, 7, 14, 21 and 28 MHz",
      "sponsor": "CQ Magazine",
      "rules_url": "https://cqwwrtty.com/rules.htm",
      "verified": true,
      "note": "",
      "exchange": "RST report plus CQ zone number; continental USA and Canada also send state or province",
      "country": "US",
      "rules_url_archived": "",
      "rules_url_checked": "2026-08-16",
      "can_enter": true,
      "eligibility_scope": "worldwide",
      "eligibility_reason": "",
      "works": "everyone",
      "practical": "",
      "log_due": "2028-09-26T23:59:00Z",
      "uid": "cq-ww-rtty-20280923T0000@contestcal",
      "start_date": "2028-09-23",
      "mode_families": [
        "RTTY",
        "Digital"
      ],
      "band_families": [
        "80m",
        "40m",
        "20m",
        "15m",
        "10m"
      ],
      "duration_bucket": "gte24"
    },
    {
      "contest_id": "cq-ww-rtty",
      "name": "CQ Worldwide DX Contest, RTTY",
      "start": "2029-09-29T00:00:00Z",
      "end": "2029-09-30T23:59:00Z",
      "start_wall": null,
      "end_wall": null,
      "local_rolling": false,
      "timezone": "",
      "duration_hours": 47.98,
      "modes": [
        "RTTY"
      ],
      "submodes": [],
      "bands": [
        "80m",
        "40m",
        "20m",
        "15m",
        "10m"
      ],
      "bands_note": "Five bands only: 3.5, 7, 14, 21 and 28 MHz",
      "sponsor": "CQ Magazine",
      "rules_url": "https://cqwwrtty.com/rules.htm",
      "verified": true,
      "note": "",
      "exchange": "RST report plus CQ zone number; continental USA and Canada also send state or province",
      "country": "US",
      "rules_url_archived": "",
      "rules_url_checked": "2026-08-16",
      "can_enter": true,
      "eligibility_scope": "worldwide",
      "eligibility_reason": "",
      "works": "everyone",
      "practical": "",
      "log_due": "2029-10-02T23:59:00Z",
      "uid": "cq-ww-rtty-20290929T0000@contestcal",
      "start_date": "2029-09-29",
      "mode_families": [
        "RTTY",
        "Digital"
      ],
      "band_families": [
        "80m",
        "40m",
        "20m",
        "15m",
        "10m"
      ],
      "duration_bucket": "gte24"
    },
    {
      "contest_id": "cq-ww-rtty",
      "name": "CQ Worldwide DX Contest, RTTY",
      "start": "2030-09-28T00:00:00Z",
      "end": "2030-09-29T23:59:00Z",
      "start_wall": null,
      "end_wall": null,
      "local_rolling": false,
      "timezone": "",
      "duration_hours": 47.98,
      "modes": [
        "RTTY"
      ],
      "submodes": [],
      "bands": [
        "80m",
        "40m",
        "20m",
        "15m",
        "10m"
      ],
      "bands_note": "Five bands only: 3.5, 7, 14, 21 and 28 MHz",
      "sponsor": "CQ Magazine",
      "rules_url": "https://cqwwrtty.com/rules.htm",
      "verified": true,
      "note": "",
      "exchange": "RST report plus CQ zone number; continental USA and Canada also send state or province",
      "country": "US",
      "rules_url_archived": "",
      "rules_url_checked": "2026-08-16",
      "can_enter": true,
      "eligibility_scope": "worldwide",
      "eligibility_reason": "",
      "works": "everyone",
      "practical": "",
      "log_due": "2030-10-01T23:59:00Z",
      "uid": "cq-ww-rtty-20300928T0000@contestcal",
      "start_date": "2030-09-28",
      "mode_families": [
        "RTTY",
        "Digital"
      ],
      "band_families": [
        "80m",
        "40m",
        "20m",
        "15m",
        "10m"
      ],
      "duration_bucket": "gte24"
    }
  ]
}