{
  "contest": {
    "id": "ref-ddfm-50mhz",
    "name": "DDFM 50 MHz",
    "sponsor": "REF",
    "sponsor_home": "https://www.r-e-f.org/",
    "country": "FR",
    "summary": "REF's national 6-metre contest, 24 hours from the second Saturday of June, exchanging department or serial plus a six-character locator.",
    "modes": [
      "SSB",
      "CW",
      "FM"
    ],
    "bands": [
      "6m"
    ],
    "exchange": "French metropolitan stations send RS(T) + department + a six-character locator (e.g. 59 75 JN18DU); all other stations send RS(T) + serial number + locator (e.g. 59 001 KN04FG).",
    "power_categories": [],
    "log_format": "IARU REG1TEST",
    "log_deadline_days": 3,
    "log_submit_url": "http://concours.r-e-f.org/tools/upload/thf.php",
    "timezone": "",
    "local_rolling": false,
    "eligibility": {
      "scope": "worldwide",
      "verified": true,
      "note": "Section 6 establishes 'Un classement F (toutes categories confondues). Un classement etranger.' -- a French ranking and a foreign ranking -- and section 4 gives foreign stations their own exchange format."
    },
    "active_from": null,
    "active_until": null,
    "note": "FM is recorded as a submode because the catalog's mode vocabulary has no FM token; REF lists 'SSB, CW, FM' as the permitted modes and all three are worked on the same 6 m band. log_deadline_days is derived from 'le premier mercredi qui suit le concours': the contest ends 1400 UTC Sunday and the following Wednesday is exactly three days later, in every year. CONTRADICTION RECORDED RATHER THAN RECONCILED: REF's 2025 contest calendar listed this contest with a 15:00 start, while this rules PDF and REF's 2026 calendar both say 14:00. The rules are encoded. Separately, REF's 2026 calendar prints the 'Coupe du REF - OM complet' row with its end before its start (27/06/2026 06:00 to 07/06/2026 14:00); no record here depends on it.",
    "verified": true,
    "rules_url": "https://concours.r-e-f.org/reglements/actuels/reg_ddfm50_fr_20250312.pdf",
    "rules_url_pattern": "",
    "rules_url_archived": "",
    "rules_url_checked": "2026-08-18",
    "source_note": "concours.r-e-f.org, 'DDFM 50 MHz -- REGLEMENT', 2: 'DATE ET HORAIRE -- Le concours debute le deuxieme samedi de juin 1400 UTC et s'acheve le dimanche a 1400 UTC.' 3: 'FREQUENCES ET MODES -- SSB, CW, FM.' 4: 'ECHANGES -- Les stations francaises de metropole passent : RS(T) + Departement + QRA locator sur 6 caracteres ... Toutes les autres stations passent : RS(T) + numero de serie + QRA locator sur 6 caracteres'. 7: 'COMPTES RENDUS -- Informatise : compte-rendu au format IARU « reg1test ».' 8: 'ENVOI -- Au plus tard le premier mercredi qui suit le concours'. REF published 13-14 June 2026 and 14-15 June 2025; the second-Saturday rule reproduces both."
  },
  "rule": {
    "plain": "Second Saturday of June",
    "raw": {
      "type": "nth_weekday",
      "month": 6,
      "n": 2,
      "weekday": 5
    },
    "start": {
      "day_offset": 0,
      "time": "1400"
    },
    "end": {
      "day_offset": 1,
      "time": "1400"
    },
    "sessions": null
  },
  "next": [
    {
      "contest_id": "ref-ddfm-50mhz",
      "name": "DDFM 50 MHz",
      "start": "2027-06-12T14:00:00Z",
      "end": "2027-06-13T14:00:00Z",
      "start_wall": null,
      "end_wall": null,
      "local_rolling": false,
      "timezone": "",
      "duration_hours": 24,
      "modes": [
        "SSB",
        "CW",
        "FM"
      ],
      "submodes": [],
      "bands": [
        "6m"
      ],
      "bands_note": "",
      "sponsor": "REF",
      "rules_url": "https://concours.r-e-f.org/reglements/actuels/reg_ddfm50_fr_20250312.pdf",
      "verified": true,
      "note": "FM is recorded as a submode because the catalog's mode vocabulary has no FM token; REF lists 'SSB, CW, FM' as the permitted modes and all three are worked on the same 6 m band. log_deadline_days is derived from 'le premier mercredi qui suit le concours': the contest ends 1400 UTC Sunday and the following Wednesday is exactly three days later, in every year. CONTRADICTION RECORDED RATHER THAN RECONCILED: REF's 2025 contest calendar listed this contest with a 15:00 start, while this rules PDF and REF's 2026 calendar both say 14:00. The rules are encoded. Separately, REF's 2026 calendar prints the 'Coupe du REF - OM complet' row with its end before its start (27/06/2026 06:00 to 07/06/2026 14:00); no record here depends on it.",
      "exchange": "French metropolitan stations send RS(T) + department + a six-character locator (e.g. 59 75 JN18DU); all other stations send RS(T) + serial number + locator (e.g. 59 001 KN04FG).",
      "country": "FR",
      "rules_url_archived": "",
      "rules_url_checked": "2026-08-18",
      "can_enter": true,
      "eligibility_scope": "worldwide",
      "eligibility_reason": "",
      "works": "everyone",
      "practical": "",
      "log_due": "2027-06-16T14:00:00Z",
      "uid": "ref-ddfm-50mhz-20270612T1400@contestcal",
      "start_date": "2027-06-12",
      "mode_families": [
        "CW",
        "SSB",
        "FM"
      ],
      "band_families": [
        "6m"
      ],
      "duration_bucket": "gte24"
    },
    {
      "contest_id": "ref-ddfm-50mhz",
      "name": "DDFM 50 MHz",
      "start": "2028-06-10T14:00:00Z",
      "end": "2028-06-11T14:00:00Z",
      "start_wall": null,
      "end_wall": null,
      "local_rolling": false,
      "timezone": "",
      "duration_hours": 24,
      "modes": [
        "SSB",
        "CW",
        "FM"
      ],
      "submodes": [],
      "bands": [
        "6m"
      ],
      "bands_note": "",
      "sponsor": "REF",
      "rules_url": "https://concours.r-e-f.org/reglements/actuels/reg_ddfm50_fr_20250312.pdf",
      "verified": true,
      "note": "FM is recorded as a submode because the catalog's mode vocabulary has no FM token; REF lists 'SSB, CW, FM' as the permitted modes and all three are worked on the same 6 m band. log_deadline_days is derived from 'le premier mercredi qui suit le concours': the contest ends 1400 UTC Sunday and the following Wednesday is exactly three days later, in every year. CONTRADICTION RECORDED RATHER THAN RECONCILED: REF's 2025 contest calendar listed this contest with a 15:00 start, while this rules PDF and REF's 2026 calendar both say 14:00. The rules are encoded. Separately, REF's 2026 calendar prints the 'Coupe du REF - OM complet' row with its end before its start (27/06/2026 06:00 to 07/06/2026 14:00); no record here depends on it.",
      "exchange": "French metropolitan stations send RS(T) + department + a six-character locator (e.g. 59 75 JN18DU); all other stations send RS(T) + serial number + locator (e.g. 59 001 KN04FG).",
      "country": "FR",
      "rules_url_archived": "",
      "rules_url_checked": "2026-08-18",
      "can_enter": true,
      "eligibility_scope": "worldwide",
      "eligibility_reason": "",
      "works": "everyone",
      "practical": "",
      "log_due": "2028-06-14T14:00:00Z",
      "uid": "ref-ddfm-50mhz-20280610T1400@contestcal",
      "start_date": "2028-06-10",
      "mode_families": [
        "CW",
        "SSB",
        "FM"
      ],
      "band_families": [
        "6m"
      ],
      "duration_bucket": "gte24"
    },
    {
      "contest_id": "ref-ddfm-50mhz",
      "name": "DDFM 50 MHz",
      "start": "2029-06-09T14:00:00Z",
      "end": "2029-06-10T14:00:00Z",
      "start_wall": null,
      "end_wall": null,
      "local_rolling": false,
      "timezone": "",
      "duration_hours": 24,
      "modes": [
        "SSB",
        "CW",
        "FM"
      ],
      "submodes": [],
      "bands": [
        "6m"
      ],
      "bands_note": "",
      "sponsor": "REF",
      "rules_url": "https://concours.r-e-f.org/reglements/actuels/reg_ddfm50_fr_20250312.pdf",
      "verified": true,
      "note": "FM is recorded as a submode because the catalog's mode vocabulary has no FM token; REF lists 'SSB, CW, FM' as the permitted modes and all three are worked on the same 6 m band. log_deadline_days is derived from 'le premier mercredi qui suit le concours': the contest ends 1400 UTC Sunday and the following Wednesday is exactly three days later, in every year. CONTRADICTION RECORDED RATHER THAN RECONCILED: REF's 2025 contest calendar listed this contest with a 15:00 start, while this rules PDF and REF's 2026 calendar both say 14:00. The rules are encoded. Separately, REF's 2026 calendar prints the 'Coupe du REF - OM complet' row with its end before its start (27/06/2026 06:00 to 07/06/2026 14:00); no record here depends on it.",
      "exchange": "French metropolitan stations send RS(T) + department + a six-character locator (e.g. 59 75 JN18DU); all other stations send RS(T) + serial number + locator (e.g. 59 001 KN04FG).",
      "country": "FR",
      "rules_url_archived": "",
      "rules_url_checked": "2026-08-18",
      "can_enter": true,
      "eligibility_scope": "worldwide",
      "eligibility_reason": "",
      "works": "everyone",
      "practical": "",
      "log_due": "2029-06-13T14:00:00Z",
      "uid": "ref-ddfm-50mhz-20290609T1400@contestcal",
      "start_date": "2029-06-09",
      "mode_families": [
        "CW",
        "SSB",
        "FM"
      ],
      "band_families": [
        "6m"
      ],
      "duration_bucket": "gte24"
    },
    {
      "contest_id": "ref-ddfm-50mhz",
      "name": "DDFM 50 MHz",
      "start": "2030-06-08T14:00:00Z",
      "end": "2030-06-09T14:00:00Z",
      "start_wall": null,
      "end_wall": null,
      "local_rolling": false,
      "timezone": "",
      "duration_hours": 24,
      "modes": [
        "SSB",
        "CW",
        "FM"
      ],
      "submodes": [],
      "bands": [
        "6m"
      ],
      "bands_note": "",
      "sponsor": "REF",
      "rules_url": "https://concours.r-e-f.org/reglements/actuels/reg_ddfm50_fr_20250312.pdf",
      "verified": true,
      "note": "FM is recorded as a submode because the catalog's mode vocabulary has no FM token; REF lists 'SSB, CW, FM' as the permitted modes and all three are worked on the same 6 m band. log_deadline_days is derived from 'le premier mercredi qui suit le concours': the contest ends 1400 UTC Sunday and the following Wednesday is exactly three days later, in every year. CONTRADICTION RECORDED RATHER THAN RECONCILED: REF's 2025 contest calendar listed this contest with a 15:00 start, while this rules PDF and REF's 2026 calendar both say 14:00. The rules are encoded. Separately, REF's 2026 calendar prints the 'Coupe du REF - OM complet' row with its end before its start (27/06/2026 06:00 to 07/06/2026 14:00); no record here depends on it.",
      "exchange": "French metropolitan stations send RS(T) + department + a six-character locator (e.g. 59 75 JN18DU); all other stations send RS(T) + serial number + locator (e.g. 59 001 KN04FG).",
      "country": "FR",
      "rules_url_archived": "",
      "rules_url_checked": "2026-08-18",
      "can_enter": true,
      "eligibility_scope": "worldwide",
      "eligibility_reason": "",
      "works": "everyone",
      "practical": "",
      "log_due": "2030-06-12T14:00:00Z",
      "uid": "ref-ddfm-50mhz-20300608T1400@contestcal",
      "start_date": "2030-06-08",
      "mode_families": [
        "CW",
        "SSB",
        "FM"
      ],
      "band_families": [
        "6m"
      ],
      "duration_bucket": "gte24"
    }
  ]
}