Kalendar UKV natjecanja za 2021. godinu
| Nadnevak | UTC | Natjecanje | Opseg | Napomena |
Siječanj |
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| 17. | 0700-1200 | 9A Activity Contest - 1. period | 50 MHz i viši | UKV |
Veljača |
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| 3. | 1700-2000 | 9A Digital Activity Contest - 2. period | 144 MHz | UKV |
| 10. | 1700-2000 | 9A Digital Activity Contest - 2. period | 432 MHz | UKV |
| 21. | 0700-1200 | 9A Activity Contest - 2. period | 50 MHz i viši | UKV |
| 21. | 0700-1200 | Brod | 144 MHz | UKV |
Ožujak |
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| 3. | 1700-2000 | 9A Digital Activity Contest - 3. period | 144 MHz | UKV |
| 6. - 7. | 1400-1400 | Hrvatski zimski UKV kup | 144 i viši | UKV |
| 10. | 1700-2000 | 9A Digital Activity Contest | 432 MHz | UKV |
| 21. | 0700-1200 | 9A Activity Contest - 3. period | 50 MHz i viši | UKV |
| 21. | 0700-1200 | Zagrebačko UKV natjecanje | 144 MHz | UKV |
Travanj |
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| 7. | 1700-2000 | 9A Digital Activity Contest - 4. period | 144 MHz | UKV |
| 14. | 1700-2000 | 9A Digital Activity Contest - 4. period | 432 MHz | UKV |
| 18. | 0700-1200 | 9A Activity Contest - 4. period | 50 MHz i viši | UKV |
| 18. | 0700-1200 | Podravina | 144 MHz | UKV |
Svibanj |
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| 1. - 2. | 1400-1400 | Hrvatski proljetni UKV kup | 144 i viši | UKV |
| 5. | 1700-2000 | 9A Digital Activity Contest - 5. period | 144 MHz | UKV |
| 12. | 1700-2000 | 9A Digital Activity Contest - 5. period | 432 MHz | UKV |
| 16. | 0700-1200 | 9A Activity Contest - 5. period | 50 MHz i viši | UKV |
| 16. | 0700-1200 | Pokuplje | 144, 432, 1 296 MHz | UKV |
Lipanj |
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| 2. | 1700-2000 | 9A Digital Activity Contest - 6. period | 144 MHz | UKV |
| 5. - 6. | 1400-1400 | 9A Microwave contest | 1,3 GHz i viši | UKV |
| 9. | 1700-2000 | 9A Digital Activity Contest - 6. period | 432 MHz | UKV |
| 19. - 20. | 1400-1400 | IARU R1 50 MHz contest | 50 MHz | UKV |
| 20. | 0700-1500 | 9A Activity Contest - 6. period | 50 MHz i viši | UKV |
| 20. | 0700-1500 | Antunovo | 144 MHz | UKV |
| 20. | 0700-1500 | Alpe Adria UHF/SHF Contest | 432 MHz i viši | UKV |
Srpanj |
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| 3. - 4. | 1400-1400 | Hrvatski ljetni UKV kup | 144 i viši | UKV |
| 3. - 4. | 1400-1400 | Croatian 50/70 MHz contest | 50 i 70 MHz | UKV |
| 7. | 1700-2000 | 9A Digital Activity Contest - 7. period | 144 MHz | UKV |
| 14. | 1700-2100 | 9A Digital Activity Contest - 7. period | 432 MHz | UKV |
| 17.-18. | 1400-1400 | IARU R1 70 MHz contest | 70 MHz | UKV |
| 18. | 0700-1200 | 9A Activity Contest - 7. period | 50 MHz i viši | UKV |
| 18. | 0700-1200 | Otok Ivanić | 144 MHz | UKV |
Kolovoz |
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| 4. | 1700-2000 | 9A Digital Activity Contest - 8. period | 144 MHz | UKV |
| 11. | 1700-2000 | 9A Digital Activity Contest - 8. period | 432 MHz | UKV |
| 8. | 0600-1359 | Alpe Adria VHF Contest | 144 MHz | UKV |
| 15. | 0700-1200 | 9A Activity Contest - 8. period | 50 MHz i viši | UKV |
| 15. | 0700-1200 | Bilogora | 144 MHz | UKV |
Rujan |
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| 1. | 1700-2000 | 9A Digital Activity Contest - 9. period | 144 MHz | |
| 4. - 5. | 1400-1400 | IARU I. region VHF Contest | 144 MHz | UKV |
| 8. | 1700-2000 | 9A Digital Activity Contest - 9. period | 432 MHz | UKV |
| 18. - 19. | 1800-1200 | IARU I. Region ATV Contest | 432 MHz i viši | UKV |
| 19. | 0700-1200 | 9A Activity Contest - 9. period | 50 MHz i viši | UKV |
| 19. | 0700-1200 | Kutinska Dunja | 144 MHz | UKV |
Listopad |
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| 2. - 3. | 1400-1400 | IARU I. region UHF/SHF Contest | 432 i viši | UKV |
| 6. | 1700-2000 | 9A Digital Activity Contest - 10. period | 144 MHz | UKV |
| 13. | 1700-2000 | 9A Digital Activity Contest - 10. period | 432 MHz | UKV |
| 17. | 0700-1200 | 9A Activity Contest - 10. period | 50 MHz i viši | UKV |
| 17. | 0700-1200 | Lipik | 144 MHz | UKV |
Studeni |
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| 3. | 1700-2000 | 9A Digital Activity Contest - 11. period | 144 MHz | UKV |
| 10. | 1700-2000 | 9A Digital Activity Contest - 11. period | 432 MHz | UKV |
| 6. - 7. | 1400-1400 | 9A CW VHF Contest | 144 MHz | UKV |
| 6. - 7. | 1400-1400 | Marconi Memorial VHF CW Contest | 144 MHz | UKV |
| 21. | 0700-1200 | 9A Activity Contest - 11. period | 50 MHz i viši | UKV |
Prosinac |
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| 1. | 1700-2000 | 9A Digital Activity Contest - 12. period | 144 MHz | UKV |
| 8. | 1700-2000 | 9A Digital Activity Contest - 12. period | 432 MHz | UKV |