A new operator, Herve F4MER, is currently QRV from New Caledonia as FK/F4MER. He uses and multiband HF antenna and tends to operate 40m. More info on QRZ.com regarding Herve’s activity.
Author: NA4DA
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KD7WPJ – Santa Cruz Island, NA-144
Oleh KD7WPJ informs DX-World that he will be active from Santa Cruz Island, NA-144 during May 9-10, 2026. QRV on all bands; mainly CW with some SSB. QSL via H/c.
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OX3LX – Greenland
Bo, OZ1DJJ will again be QRV from Aasiaat Island, NA-134 as OX3LX during May 12-22, 2026. Grid: GP38NQ. This is a work trip so only active when time permits mainly on 30-10m; always checking 6m Es. QSL via OZ0J.
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Rhizomatica Releases Mercury, a Fully Open-Source Modem for Digital on HF
The following is a press release from Rhizomatica:
May 2026 — Rhizomatica is pleased to officially launch Mercury, a completely open-source Digital Radio OFDM protocol for HF broadcast and peer-to-peer ARQ connections with compatible TCP interfaces, built for reliable store-and-forward email and file transfer over HF radio links. Mercury is the newest element of the HERMES software suite, actively developed by Rhizomatica since 2017, with generous funding from ARDC and others.
Mercury is written in C, released under a GPL-3.0 license, and features a modular architecture with per-direction mode selection, hybrid SNR + delivery feedback-based gear-shifting, split control/data channel design, and uses field-proven FreeDV digital data modes, with each mode kept resident in a pool, eliminating codec re-initialization overhead. Pre-built binaries are available for Windows and Debian operating systems and Mercury is suitable for use with most HF transceivers and completely compliant for amateur use.
In early tests, compared to the commercial alternative, Mercury has performed well and is nearly at parity in optimal SNR conditions and outperforms the alternative in poor SNR conditions.
Not only has Rhizomatica developed a fully open-source software modem, they have done so to empower communities in need of their own communication infrastructure. We are proud to have supported Rhizomatica in this work, and very excited to see it now available to the amateur community and others around the world using HF for critical communication. —Rosy Schechter (KJ7RYV), Executive Director of ARDC.
I am very pleased to see Rhizomatica using the FreeDV data modes combined with their own custom ARQ protocol to send data over low SNR HF channels. It is great to see Rhizomatica embracing those waveforms, and spreading the use of open source in HF Data. —David Rowe (VK5DGR), inventor of Codec 2 and FreeDV.
More information can be found from the following sources, or by contacting Rhizomatica directly using the Contact information provided below.
- MAILING LIST https://lists.riseup.net/www/info/hermes-general
- SOURCE CODE https://github.com/Rhizomatica/mercury
- YOUTUBE DEMOS https://www.youtube.com/@rhizomatica_communications/playlists
CONTACT
- Peter Bloom – General Coordinator of Rhizomatica. peter@rhizomatica.org
- Dr. Rafael Diniz (PU2UIT) – HERMES Lead Developer & Project Coordinator. rafael@rhizomatica.org
ABOUT
Rhizomatica Communications is a US-based non-profit with the mission to support communities to build and maintain self-governed and owned communication and energy infrastructure. https://www.rhizomatica.orgHERMES
is an open-source software stack created by Rhizomatica to make it easier to use HF/shortwave radio for digital communications. Since 2017, together with social organizations and remote communities around the world, Rhizomatica has been designing, building and testing HERMES to create reliable, secure, long-range, autonomous voice and digital communications. https://hermes.radio/Source: Rhizomatica
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VJ2L – Lord Howe Island
A team of 7 operators will activate Lord Howe Island from 1 – 14 June 2026. This will be a DX-Marathon activation, and we will be aiming to work as many DXCC entities and Zones as possible in the 2026 DX Marathon contest. Of course, this will be a great opportunity for DX-Marathon contestants to […]
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JW/G1VAQ – Svalbard
Tom, G1VAQ will be operating from Svalbard as JW/G1VAQ for a short period in May 2026. Portable – QRP 5W – CW – 20m. Equipment: (tr)uSDX, EFHW antenna. Please be patient with his CW, says Tom. QSOs will be confirmed via LoTW and QRZ.com upon his return home.
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Time is Running Out to Apply for a Chance to Contact a Ham in Space in 2027
Act today. There are only a couple of weeks left to submit your group’s application to talk with a crewmember on the International Space Station (ISS) in 2027
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Space—the final frontier for mankind and ham-kind alike.
While OnAllBands has been talking a lot lately about making QSOs with rare DXCC entities (Bouvet Island, Desecheo Island, et. al.), there’s no doubt that contacting the International Space Station ranks pretty high on the list of cool things you can do with ham radio. And if you want to make this happen in 2027, there’s still time for your organization to apply to host an amateur radio contact with a crewmember on board the ISS.
Estimated to begin around January 1 and run until June 30, 2027, crewmembers on the ISS will take part in 10-minute-long (give or take) voice-only communications with students. The Q&A will give insight about what it is like to work and live in space. Other topics that can be discussed include research being conducted on the station, satellite communication, wireless technology, and radio science. Of course, available spots depend on crew scheduling and the ISS’s orbit.
These ISS amateur radio events are hosted by Amateur Radio on the International Space Station (ARISS). The deadline to submit a proposal is May 22, 2026, 11:59 pm Pacific Time.
To maximize these radio contacts, the ARISS program looks for organizations that will draw large numbers of participants and integrate the radio contact into a well-developed education plan. Because of the nature of human spaceflight and the complexity of scheduling activities aboard the ISS, organizations must demonstrate flexibility to accommodate changes in contact dates and times, according to the official ARISS proposal page. You can find out more on how to apply here.
Amateur radio and space travel go together like french fries and a Wendy’s Frosty. It’s confusing at first, but when they merge, you’ll be wanting to come back for seconds. In fact, there were three hams on NASA’s Artemis II mission—a test flight that laid the foundation for the organization’s return to the moon. Those hams are Reid Wiseman, KF5LKT; Victor Glover, KI5BKC; and Jeremy Hansen, KF5LKU. Artemis II crewmember Christina Koch is not a licensed operator.

Artemis II crew (Image/NASA) Sadly, there was no ham radio equipment on board, according to ARISS.
The goal of this mission was to test the Orion spacecraft’s life-support, navigation, and communication systems with astronauts on board. It was the first crewed lunar flyby in about 50 years. It began on April 1, when the Orion launched from the Kennedy Space Center in Florida. The astronauts orbited around the moon and eventually returned home on April 11.
The last time we went to the moon was in 1972, when astronauts Eugene Cernan and Harrison Schmitt spent three days exploring the Taurus-Littrow valley. Cernan was the last human to set foot on the moon. Subsequent missions to the moon solely featured unmanned probes.
Here’s a fun fact: Besides the benefits of having an ocean nearby to catch spacecraft debris, NASA uses its base in Florida as a launch point for space missions because of its proximity to the equator. That’s because the Earth’s eastward rotation spins faster the closer you get to that line, which offers a speed boost plus fuel savings. The closer you are, the more benefits you get.
From all of us at OnAllBands, best of luck in your pursuit of helping youngsters contact the ISS, providing a memory that will undoubtedly inspire them to explore beyond our world. Let us know if your organization gets one of the coveted spots; we’d love to hear about it and write about your experience!
Read this OnAllBands article by Katie, KE8LQR, about her YOTA group’s experience contacting NASA astronaut Nichole Ayers, KJ5GWI, on the ISS.

(Image/NASA) The post Time is Running Out to Apply for a Chance to Contact a Ham in Space in 2027 appeared first on OnAllBands.
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DX-World Weekly Bulletin
[#662] The latest FREE NON-SUBSCRIPTION DX-World Weekly Bulletin written by Bjorn ON9CFG is available to download. Click below to get the newest jam-packed edition which this week runs to 16 pages. Previous bulletins can all be found here. Please contact Bjorn with any updates or errors. DOWNLOAD THE LATEST BULLETIN =====
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C5R – The Gambia
[NEWS UPDATE] – Following on from last year’s activity, team C5R will again be active from The Gambia (QTH: Tanji town) at the beginning of October ’26. Full details to follow in due course. Check out detailed info, pics and soundbite from 2025 below. [OCTOBER 24, 2025] – Lui, YT3PL reports: “We had bad storm […]
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T88PB – Palau
Nobu JA0JHQ will again be active from Palau as T88PB during May 27-31 and June 20-22, 2026. Participation in both the CQ WPX CW and the All Asian DX CW contests. QSL via H/c, LoTW. QTH: Palau Radio Club, Koror.