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XF4B

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.
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XF4B Log search 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

XF4B Socorro IslandSocorro Island, Revillagigedo Islands, Mexico. Author - Mathieu Chardonnet.

XF4B. Where is Socorro Island located. Map.

XF4B. Sunrise 11-13-2025 at 13:29 GMT sunset at 00:47 GMT
XF4B comments forum

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5 Comments

100%
Rating: 5 of 5
Don
  • Callsign: N1DG
  • 2025-10-30 15:46:03
XF4B Socorro Island News The ship departs 8 AM local XF4 time back to Manzanillo. Mark is QRT. Full report after he returns home and logs will be posted to Clublog after he sends them to me. Don N1DG
100%
Rating: 5 of 5
Don
  • Callsign: N1DG
  • 2025-10-29 23:10:27
Mark reports that due to lack of internet and PC issues he has been unable to get on FT8. All those stations signing FT8 as XF4B are Socorro Pirates. Don N1DG
100%
Rating: 5 of 5
Don
  • Callsign: N1DG
  • 2025-10-28 04:26:24
XF4B Socorro Island News. Mark arrived around 17:00Z today and was on 14220 around 21:30. He has no internet so information will be spotty.
100%
Rating: 5 of 5
Mark
  • Callsign: XE1B
  • 2025-10-24 02:22:05
On October 25, 2025 Mark, XE1B, is returning to Revillagigedo for a short visit to meet the new base commander and set the conditions for an international team with remote capabilities for the future. Access to the base is severely restricted and only via a Navy battleship making supply runs from Manzanillo, Mexico. The next Navy trip is scheduled for a 25 October departure from . Mark expects to be active from Socorro for 5 days operating (it’s a 36 hour trip) starting on the 27th. The Zapoteco will be Mark's transport: Mark is a 3 time veteran of trips there, having activated XF4 in 1999, 2011, and 2018. He has a new license for this trip (the callsign will be released when he is QRV). He also has permission from the Navy and the other two regulatory agencies to visit the island and operate. This is a self funded trip using Mark’s personal equipment and some purchases in the US by N1DG. It will be a low profile, low geographic impact operation showing the Commander that a DXpedition can be conducted without a major impact on the Island’s mission. Use of remote operators via the NCDXF RIB technology will also be discussed. Accordingly, do not expect a Mega DXpedition this time. Mark’s intent is to make as many ATNO contacts and lower XF4’s rank of 24th most wanted (12th in Europe) by as much as one operator can do in 5 days. Mark will bring 4 antennas, 2 radios and one linear covering 80 to 6 meters. He will operate SSB and FT8 at the same time. There will be No automated FT8 QSOs. He is unsure of internet availability so there will be no streaming online logs. QSL after the operation using clublog only. N1DG will handle the QSL processing. LOTW QSOs will be uploaded as OQRS requests are processed. After postage and QSL printing costs, all excess proceeds will be donated to the Northern California DX Foundation.
100%
Rating: 5 of 5
Mark
  • Callsign: XE1B
  • 2025-10-23 20:14:07
XF4B News For Immediate Release The return to Socorro Island Next week (October 25) Mark, XE1B, is returning to Revillagigedo for a short visit to meet the new base commander and set the conditions for an international team with remote capabilities for the future. Access to the base is severely restricted and only via a Navy battleship making supply runs from Baja, Mexico. The next Navy trip is scheduled for a 23 October departure from Socorro and a return on the 30th of October. That will allow Mark a 5 day window of operating (it’s a 36 hour trip). Mark is a 3 time veteran of trips there, having activated XF4 in 1999, 2011, and 2018. He has a new license for this trip (the callsign will be released when he is QRV). He also has permission from the Navy and the other two regulatory agencies to visit the island and operate. This is a self funded trip using Mark’s personal equipment and some purchases in the US by N1DG. It will be a low profile, low geographic impact operation showing the Commander that a DXpedition can be conducted without a major impact on the Island’s mission. Use of remote operators via the NCDXF RIB technology will also be discussed. Accordingly, do not expect a Mega DXpedition this time. Mark’s intent is to make as many ATNO contacts and lower XF4’s rank of 24th most wanted (12th in Europe) by as much as one operator can do in 5 days. Mark will bring 4 antennas, 2 radios and one linear covering 80 to 6 meters. He will operate SSB and FT8 at the same time. There will be No automated FT8 QSOs. He is unsure of internet availability so there will be no streaming online logs. QSL after the operation using Club Log only. N1DG will handle the QSL processing. LOTW QSOs will be uploaded as OQRS requests are processed. After postage and QSL printing costs, all excess proceeds will be donated to the Northern California DX