OK/OM DX Contest, SSB

The Czech and Slovak national DX contest, phone leg: 24 hours on the second weekend of April, OK and OM stations sending a three-letter county code.

Rules at okomdx.crk.czThe rules are the sponsor's. This page holds the dates and the facts.

When it runs

Second full weekend of April

1200Z Saturday → 1159Z Sunday

Times are UTC, as the sponsor states them.

Next runnings

1200Z Sat 10 Apr → 1159Z Sun 11 Apr · 23h 59m2027
in 191 days
Logs due 1159Z Sun 18 Apr
1200Z Sat 8 Apr → 1159Z Sun 9 Apr · 23h 59m2028
in 555 days
Logs due 1159Z Sun 16 Apr
1200Z Sat 14 Apr → 1159Z Sun 15 Apr · 23h 59m2029
in 926 days
Logs due 1159Z Sun 22 Apr
1200Z Sat 13 Apr → 1159Z Sun 14 Apr · 23h 59m2030
in 1290 days
Logs due 1159Z Sun 21 Apr

Operating

Modes: SSB
Bands: 160m80m40m20m15m10m
1.8 through 28 MHz, WARC bands excluded
Exchange: Non-Czech and Slovak stations send a signal report + a QSO number starting with 001; Czech and Slovak stations send a signal report + their three-letter county code.
Power categories: High PowerLow Power 100 WQRP 5 W
Logs: Cabrillo · due 7 days after the end
Who can enter: Anyone, anywhere.
Rule 5.1 provides an exchange for 'Non-Czech and Slovak stations' and the categories are open to them, so entry is worldwide with OK/OM stations as the target.

Where this comes from

Checked against the sponsor: Yes. The rule on this page was read off CRK / SARA's own published rules. Link last confirmed 2026-08-18.
What the source says: okomdx.crk.cz (OK/OM DX Contest SSB rules, English): 'The Czech Radio Club, CRK in cooperation with Slovak radioclub SARA'. '2. Contest Period -- second weekend in April, i.e. 1200 UTC 11 April - 1159 UTC 12 April 2026'. 'All bands, 1.8 through 28 MHz, WARC bands excluded'. '5.1 Non-Czech and Slovak stations: signal report + QSO number, starting with 001. / 5.2 Czech and Slovak stations: signal report + County code (three letters).' '11.1 Logs must be submitted to the contest sponsors within 7 days after the end of the contest .. (APRIL 19, 2026, 2359 UTC)'.
Recorded caveats: The parenthetical deadline (19 April 2026, 2359 UTC) is the right date for the seven-day interval but 23:59 rather than the 11:59 that end-plus-7-days gives; the interval is the stated rule, so the interval is encoded. WORDING DIFFERENCE, RECORDED RATHER THAN RECONCILED: the SSB rules say 'second weekend in April' where the CW rules say 'Second (full) weekend in November'. The two readings cannot diverge at n = 2 -- the second Saturday of a month is at most the 14th, so its Sunday is always in the same month -- so no choice between them was needed. BLOCKER RECORDED, NOT WORKED AROUND: okomdx.crk.cz serves a TLS certificate issued for default.web4u.cz, so HTTPS fails validation and the rules are reachable only over plain HTTP. rules_url is therefore http:// deliberately; it is not an oversight, and the link checker will keep reporting it as such until the Czech Radio Club fixes the host.

Something wrong? How to report it — a link to the sponsor's own page is all it takes.

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