{
  "contest": {
    "id": "ok-dx-rtty",
    "name": "OK DX RTTY Contest",
    "sponsor": "CRK",
    "sponsor_home": "https://www.crk.cz/",
    "country": "CZ",
    "summary": "A one-day Baudot RTTY contest on the third full weekend of December, Saturday 0000-2400 UTC, exchanging RST and CQ zone.",
    "modes": [
      "RTTY"
    ],
    "bands": [
      "80m",
      "40m",
      "20m",
      "15m",
      "10m"
    ],
    "exchange": "RST + CQ Zone.",
    "power_categories": [
      {
        "name": "High Power",
        "max_watts": null
      },
      {
        "name": "Low Power",
        "max_watts": 100
      }
    ],
    "log_format": "Cabrillo",
    "log_deadline_days": null,
    "log_submit_url": "",
    "timezone": "",
    "local_rolling": false,
    "eligibility": {
      "scope": "worldwide",
      "verified": false,
      "note": "The rules state no entrant clause. The exchange is RST + CQ Zone with no home-country distinction and the categories are open, so worldwide is the strong reading -- but it is a reading, not a quote."
    },
    "active_from": null,
    "active_until": null,
    "note": "TWO PROBLEMS IN THE SPONSOR'S OWN TEXT, BOTH RECORDED RATHER THAN RECONCILED. First, the news item announcing the 19 December 2026 edition prints 'Deadline for log upload: 26. 12. 2025 23:59:59' -- the wrong year for a 2026 contest. Second, that 26 December date is not what the rules' own seven-day interval produces here: this catalog stores the end as 24:00 on the Saturday, i.e. 00:00 on the Sunday, and seven days from there is 27 December. log_deadline_days is therefore left unset and both statements are quoted, the same treatment given to JARL's All Asian DX Contest. ATTRIBUTION CAVEAT: neither the English nor the Czech rules page names an organising society. The sponsor is recorded as the Czech Radio Club on the strength of the crk.cz hosting domain and the okrtty-at-crk.cz log address, and that inference is stated here rather than hidden. BLOCKER: okrtty.crk.cz serves a TLS certificate issued for default.web4u.cz, so rules_url is http:// deliberately.",
    "verified": true,
    "rules_url": "http://okrtty.crk.cz/index.php?page=english",
    "rules_url_pattern": "",
    "rules_url_archived": "",
    "rules_url_checked": "2026-08-18",
    "source_note": "okrtty.crk.cz (OK DX RTTY Contest, English rules): '1) Date: 00:00 UTC to 24:00 UTC Saturday, 3rd full weekend in December.' '2) Mode: RTTY - Baudot'. '3) Bands: 10, 15, 20, 40 and 80 meters'. '6) Message: RST + CQ Zone'. Categories are High Power (over 100 W) and Low Power (under 100 W). Logs are due 'not later than 7th day after the contest'. The site's own news item independently gives the 2026 edition as '19. 12. 2026, 00:00-24:00 UTC'."
  },
  "rule": {
    "plain": "Third full weekend of December",
    "raw": {
      "type": "nth_full_weekend",
      "month": 12,
      "n": 3
    },
    "start": {
      "day_offset": 0,
      "time": "0000"
    },
    "end": {
      "day_offset": 0,
      "time": "2400"
    },
    "sessions": null
  },
  "next": [
    {
      "contest_id": "ok-dx-rtty",
      "name": "OK DX RTTY Contest",
      "start": "2026-12-19T00:00:00Z",
      "end": "2026-12-20T00:00:00Z",
      "start_wall": null,
      "end_wall": null,
      "local_rolling": false,
      "timezone": "",
      "duration_hours": 24,
      "modes": [
        "RTTY"
      ],
      "submodes": [
        "Baudot"
      ],
      "bands": [
        "80m",
        "40m",
        "20m",
        "15m",
        "10m"
      ],
      "bands_note": "",
      "sponsor": "CRK",
      "rules_url": "http://okrtty.crk.cz/index.php?page=english",
      "verified": true,
      "note": "TWO PROBLEMS IN THE SPONSOR'S OWN TEXT, BOTH RECORDED RATHER THAN RECONCILED. First, the news item announcing the 19 December 2026 edition prints 'Deadline for log upload: 26. 12. 2025 23:59:59' -- the wrong year for a 2026 contest. Second, that 26 December date is not what the rules' own seven-day interval produces here: this catalog stores the end as 24:00 on the Saturday, i.e. 00:00 on the Sunday, and seven days from there is 27 December. log_deadline_days is therefore left unset and both statements are quoted, the same treatment given to JARL's All Asian DX Contest. ATTRIBUTION CAVEAT: neither the English nor the Czech rules page names an organising society. The sponsor is recorded as the Czech Radio Club on the strength of the crk.cz hosting domain and the okrtty-at-crk.cz log address, and that inference is stated here rather than hidden. BLOCKER: okrtty.crk.cz serves a TLS certificate issued for default.web4u.cz, so rules_url is http:// deliberately.",
      "exchange": "RST + CQ Zone.",
      "country": "CZ",
      "rules_url_archived": "",
      "rules_url_checked": "2026-08-18",
      "can_enter": true,
      "eligibility_scope": "worldwide",
      "eligibility_reason": "",
      "works": "everyone",
      "practical": "",
      "log_due": null,
      "uid": "ok-dx-rtty-20261219T0000@contestcal",
      "start_date": "2026-12-19",
      "mode_families": [
        "RTTY",
        "Digital"
      ],
      "band_families": [
        "80m",
        "40m",
        "20m",
        "15m",
        "10m"
      ],
      "duration_bucket": "gte24"
    },
    {
      "contest_id": "ok-dx-rtty",
      "name": "OK DX RTTY Contest",
      "start": "2027-12-18T00:00:00Z",
      "end": "2027-12-19T00:00:00Z",
      "start_wall": null,
      "end_wall": null,
      "local_rolling": false,
      "timezone": "",
      "duration_hours": 24,
      "modes": [
        "RTTY"
      ],
      "submodes": [
        "Baudot"
      ],
      "bands": [
        "80m",
        "40m",
        "20m",
        "15m",
        "10m"
      ],
      "bands_note": "",
      "sponsor": "CRK",
      "rules_url": "http://okrtty.crk.cz/index.php?page=english",
      "verified": true,
      "note": "TWO PROBLEMS IN THE SPONSOR'S OWN TEXT, BOTH RECORDED RATHER THAN RECONCILED. First, the news item announcing the 19 December 2026 edition prints 'Deadline for log upload: 26. 12. 2025 23:59:59' -- the wrong year for a 2026 contest. Second, that 26 December date is not what the rules' own seven-day interval produces here: this catalog stores the end as 24:00 on the Saturday, i.e. 00:00 on the Sunday, and seven days from there is 27 December. log_deadline_days is therefore left unset and both statements are quoted, the same treatment given to JARL's All Asian DX Contest. ATTRIBUTION CAVEAT: neither the English nor the Czech rules page names an organising society. The sponsor is recorded as the Czech Radio Club on the strength of the crk.cz hosting domain and the okrtty-at-crk.cz log address, and that inference is stated here rather than hidden. BLOCKER: okrtty.crk.cz serves a TLS certificate issued for default.web4u.cz, so rules_url is http:// deliberately.",
      "exchange": "RST + CQ Zone.",
      "country": "CZ",
      "rules_url_archived": "",
      "rules_url_checked": "2026-08-18",
      "can_enter": true,
      "eligibility_scope": "worldwide",
      "eligibility_reason": "",
      "works": "everyone",
      "practical": "",
      "log_due": null,
      "uid": "ok-dx-rtty-20271218T0000@contestcal",
      "start_date": "2027-12-18",
      "mode_families": [
        "RTTY",
        "Digital"
      ],
      "band_families": [
        "80m",
        "40m",
        "20m",
        "15m",
        "10m"
      ],
      "duration_bucket": "gte24"
    },
    {
      "contest_id": "ok-dx-rtty",
      "name": "OK DX RTTY Contest",
      "start": "2028-12-16T00:00:00Z",
      "end": "2028-12-17T00:00:00Z",
      "start_wall": null,
      "end_wall": null,
      "local_rolling": false,
      "timezone": "",
      "duration_hours": 24,
      "modes": [
        "RTTY"
      ],
      "submodes": [
        "Baudot"
      ],
      "bands": [
        "80m",
        "40m",
        "20m",
        "15m",
        "10m"
      ],
      "bands_note": "",
      "sponsor": "CRK",
      "rules_url": "http://okrtty.crk.cz/index.php?page=english",
      "verified": true,
      "note": "TWO PROBLEMS IN THE SPONSOR'S OWN TEXT, BOTH RECORDED RATHER THAN RECONCILED. First, the news item announcing the 19 December 2026 edition prints 'Deadline for log upload: 26. 12. 2025 23:59:59' -- the wrong year for a 2026 contest. Second, that 26 December date is not what the rules' own seven-day interval produces here: this catalog stores the end as 24:00 on the Saturday, i.e. 00:00 on the Sunday, and seven days from there is 27 December. log_deadline_days is therefore left unset and both statements are quoted, the same treatment given to JARL's All Asian DX Contest. ATTRIBUTION CAVEAT: neither the English nor the Czech rules page names an organising society. The sponsor is recorded as the Czech Radio Club on the strength of the crk.cz hosting domain and the okrtty-at-crk.cz log address, and that inference is stated here rather than hidden. BLOCKER: okrtty.crk.cz serves a TLS certificate issued for default.web4u.cz, so rules_url is http:// deliberately.",
      "exchange": "RST + CQ Zone.",
      "country": "CZ",
      "rules_url_archived": "",
      "rules_url_checked": "2026-08-18",
      "can_enter": true,
      "eligibility_scope": "worldwide",
      "eligibility_reason": "",
      "works": "everyone",
      "practical": "",
      "log_due": null,
      "uid": "ok-dx-rtty-20281216T0000@contestcal",
      "start_date": "2028-12-16",
      "mode_families": [
        "RTTY",
        "Digital"
      ],
      "band_families": [
        "80m",
        "40m",
        "20m",
        "15m",
        "10m"
      ],
      "duration_bucket": "gte24"
    },
    {
      "contest_id": "ok-dx-rtty",
      "name": "OK DX RTTY Contest",
      "start": "2029-12-15T00:00:00Z",
      "end": "2029-12-16T00:00:00Z",
      "start_wall": null,
      "end_wall": null,
      "local_rolling": false,
      "timezone": "",
      "duration_hours": 24,
      "modes": [
        "RTTY"
      ],
      "submodes": [
        "Baudot"
      ],
      "bands": [
        "80m",
        "40m",
        "20m",
        "15m",
        "10m"
      ],
      "bands_note": "",
      "sponsor": "CRK",
      "rules_url": "http://okrtty.crk.cz/index.php?page=english",
      "verified": true,
      "note": "TWO PROBLEMS IN THE SPONSOR'S OWN TEXT, BOTH RECORDED RATHER THAN RECONCILED. First, the news item announcing the 19 December 2026 edition prints 'Deadline for log upload: 26. 12. 2025 23:59:59' -- the wrong year for a 2026 contest. Second, that 26 December date is not what the rules' own seven-day interval produces here: this catalog stores the end as 24:00 on the Saturday, i.e. 00:00 on the Sunday, and seven days from there is 27 December. log_deadline_days is therefore left unset and both statements are quoted, the same treatment given to JARL's All Asian DX Contest. ATTRIBUTION CAVEAT: neither the English nor the Czech rules page names an organising society. The sponsor is recorded as the Czech Radio Club on the strength of the crk.cz hosting domain and the okrtty-at-crk.cz log address, and that inference is stated here rather than hidden. BLOCKER: okrtty.crk.cz serves a TLS certificate issued for default.web4u.cz, so rules_url is http:// deliberately.",
      "exchange": "RST + CQ Zone.",
      "country": "CZ",
      "rules_url_archived": "",
      "rules_url_checked": "2026-08-18",
      "can_enter": true,
      "eligibility_scope": "worldwide",
      "eligibility_reason": "",
      "works": "everyone",
      "practical": "",
      "log_due": null,
      "uid": "ok-dx-rtty-20291215T0000@contestcal",
      "start_date": "2029-12-15",
      "mode_families": [
        "RTTY",
        "Digital"
      ],
      "band_families": [
        "80m",
        "40m",
        "20m",
        "15m",
        "10m"
      ],
      "duration_bucket": "gte24"
    },
    {
      "contest_id": "ok-dx-rtty",
      "name": "OK DX RTTY Contest",
      "start": "2030-12-21T00:00:00Z",
      "end": "2030-12-22T00:00:00Z",
      "start_wall": null,
      "end_wall": null,
      "local_rolling": false,
      "timezone": "",
      "duration_hours": 24,
      "modes": [
        "RTTY"
      ],
      "submodes": [
        "Baudot"
      ],
      "bands": [
        "80m",
        "40m",
        "20m",
        "15m",
        "10m"
      ],
      "bands_note": "",
      "sponsor": "CRK",
      "rules_url": "http://okrtty.crk.cz/index.php?page=english",
      "verified": true,
      "note": "TWO PROBLEMS IN THE SPONSOR'S OWN TEXT, BOTH RECORDED RATHER THAN RECONCILED. First, the news item announcing the 19 December 2026 edition prints 'Deadline for log upload: 26. 12. 2025 23:59:59' -- the wrong year for a 2026 contest. Second, that 26 December date is not what the rules' own seven-day interval produces here: this catalog stores the end as 24:00 on the Saturday, i.e. 00:00 on the Sunday, and seven days from there is 27 December. log_deadline_days is therefore left unset and both statements are quoted, the same treatment given to JARL's All Asian DX Contest. ATTRIBUTION CAVEAT: neither the English nor the Czech rules page names an organising society. The sponsor is recorded as the Czech Radio Club on the strength of the crk.cz hosting domain and the okrtty-at-crk.cz log address, and that inference is stated here rather than hidden. BLOCKER: okrtty.crk.cz serves a TLS certificate issued for default.web4u.cz, so rules_url is http:// deliberately.",
      "exchange": "RST + CQ Zone.",
      "country": "CZ",
      "rules_url_archived": "",
      "rules_url_checked": "2026-08-18",
      "can_enter": true,
      "eligibility_scope": "worldwide",
      "eligibility_reason": "",
      "works": "everyone",
      "practical": "",
      "log_due": null,
      "uid": "ok-dx-rtty-20301221T0000@contestcal",
      "start_date": "2030-12-21",
      "mode_families": [
        "RTTY",
        "Digital"
      ],
      "band_families": [
        "80m",
        "40m",
        "20m",
        "15m",
        "10m"
      ],
      "duration_bucket": "gte24"
    }
  ]
}