Mark, XE1B will be active as XF4B from Socorro Island, Revillagigedo Islands, IOTA NA - 030, starting 25 October 2025.
He will operate on 80 - 6m, SSB, FT8, during 36 hours.
QSL via ClubLog OQRS.
Planned freqs:
| Band | SSB | FT8 F/H | |
| 80m | 3790 kHz | 3567 kHz | |
| 60m | - | 5357 kHz | |
| 40m | 7182 kHz | 7056 kHz | |
| 30m | - | 10131 kHz | |
| 20m | 14195 kHz | 14091 kHz | |
| 17m | 18130 kHz | 18095 kHz | |
| 15m | 21295 kHz | 21091 kHz | |
| 12m | 24930 kHz | 24911 kHz | |
| 10m | 28495 kHz | 28091 kHz | |
| 6m | - | 50310 kHz |