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.
Author: NA4DA
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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.
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Guide to Prepping for ARRL Field Day 2026: Part 1, Coaxial Cables
The 2026 edition of ARRL Field Day will be June 27-28. Your fellow hams at OnAllBands want to make sure you’re fully prepared for one of the most active and exciting weekends on the amateur radio calendar.
As we’ve said before, Field Day is whatever you or your club want to make of it:
- A contest
- Serious practice for emergency operations
- An outdoor laboratory for antenna experimentation
- The opportunity to try out an alternate power source
- The chance to promote the amateur radio service to the community
- A weekend celebration that combines good friends, QSOs, and BBQ
- All of the above…and more!

Tom, KB8UUZ, DX Engineering technical writer, and George, K3GP, DX Engineering customer/technical support specialist, at Field Day 2022. (Image/DX Engineering) 
Scott, N3RA, DX Engineering sales manager, handling CW duties.
(Image/DX Engineering)While operators may approach the event differently, most would agree that getting your stations in top shape and being ready for the unexpected are keys to a successful weekend. Over the next couple of months, OnAllBands will be presenting suggestions on ways to make this year’s Field Day a memorable one for your group.
We begin our Field Day prep guide with one of our favorite topics: coaxial cable.
Before you consider purchasing a new transceiver, a more efficient antenna, or a strong portable telescoping mast, take the time to assess your coaxial cable well before Field Day rears its unpredictable head. Here are a few reasons to make your coax a priority:
- Coaxial cable that has seen years of use or shows signs of damage can seriously affect on-air performance.
- Cheaper coaxial cable may appear to be doing a decent job, but you’re missing out on vastly improved performance, additional QSOs, and a lot more fun on Field Day by not investing in a higher grade of cable.
- This annual gathering of hams offers a chance to test your emergency operating capabilities—the event’s main purpose since the first Field Day in 1933. That means you should have reliable gear that performs well. If your coax does what’s it’s supposed to on Field Day, you’ll know it will be ready when you’re called on for critical communication.
- It’s a relatively small investment in peace of mind and better results. Further, purchase upgraded coaxial cable for Field Day and enjoy its benefits for all your POTA and other activations for years to come.
Why Choose DX Engineering Coaxial Cable?
DX Engineering coaxial cable is trusted by amateur operators everywhere. Select DX Engineering branded coax and you’ll be using the same products relied on by high-profile DXpeditioners who have one shot to get every detail right when traveling halfway around the world. DX Engineering coaxial cable was used on these recent activations and continues to make a difference for hams just like you (see customer quotes from five-star reviews below):
- Bouvet Island 3Y0K: DX Engineering 400MAX PL-259 Low-Loss 50-ohm Coax
“400MAX has the low loss that meets my needs perfectly when running QRP and you want to maximize power to the antenna. I’ve found it to be very durable as well.”
Dudley, DX Engineering customer
- Desecheo Island KP5/NP3VI: DX Engineering RG-213U PL-259 Low-Loss 50-ohm Coax
“None better. Have used DX Engineering coax assemblies for years for both short and long runs, indoors and outdoors, running legal limit. Nicely assembled with premium PL-259s.”
John, DX Engineering customer
- Sable Island CY0S: DX Engineering RG-8X PL-259 Low-Loss 50-ohm Coax
“The best assembled coax I know of. When I want excellent preassembled coax, DX Engineering is the best choice. Durable jacket, excellent connectors, very pliable.”
Tim, DX Engineering customer

The 2023 Swains Island W8S team holds coaxial cable assemblies from DX Engineering. (Image/Swains W8S) Assistance from Field Day Pros
DX Engineer’s support team has a combined 1,000-plus years of amateur radio experience. If you’re not sure what coaxial cable is right for your setup, you’ll receive knowledgeable advice to make sure you get precisely what you need.
Premade Coaxial Cable Assembly Options
DX Engineering coax assemblies are available in lengths from 1.5 to 200 feet (length options vary per type of coax). They either come with DX Engineering’s patented Next Generation crimp/solder 8U or 8X PL-259 (UHF male), Amphenol 83-1SP PL-259, Type-N male, or BNC male connectors on both ends. Assemblies also come with a PL-259 connector on one end and Type-N or BNC male connector on the other (check specific cable types for availability). DX Engineering coaxial cable can also be purchased by the foot and by the roll up to 1,000 feet.
DX Engineering coax is assembled, hi-pot tested, and heat-shrink weather-sealed for long life by our own experienced technicians. Plus, you typically receive same-day shipping on in-stock orders placed before 9 pm ET Monday-Friday.

(Image/DX Engineering) Easy Online Ordering
Ordering premade cable assemblies is fast and simple at DXEngineering.com. Choose from these DX Engineering coaxial cables:
- RG-214 Double-Shielded 50-ohm
- RG-400 High-Isolation Double-Shielded 50-ohm
- 400MAX Low-Loss Cable 50-ohm
- RG-8U Low-Loss 50-ohm Foam Dielectric
- RG-8X Low-Loss 50-ohm Foam Dielectric
- RG-6/U 75-ohm Quad-Shield
- RG-58A/U 52-ohm
- RG-11U 75-ohm Bulk
- RG-213U Low-Loss Mil-Spec 50-ohm
Make Sure Others See Your Coax on Field Day!
Also choose DX Engineering high-visibility RG-8X cable with an orange PVC jacket. Assemblies come with DX Engineering’s patented PL-259 connectors or BNC male connectors on both ends (1.5 to 100 feet) or with a PL-259 on one end and a BNC male on the other (3 to 100 feet). High-visibility RG-8X is also available in spools of 1,000 feet or by the foot.
Also check out high-visibility BNC male RG-174 cable assemblies from 1.5 to 50 feet.

(Image/DX Engineering) Watch this DX Engineering video on the many benefits of DX Engineering high-visibility coaxial cable for Field Day and other outdoor activations:
Cables Made to Order
DX Engineering’s online Custom Cable Builder lets you select made-to-order coaxial cables that meet your precise needs (type of coax, type of connectors on both ends, length up to 300 feet).

(Image/DX Engineering) These custom-ordered cables are professionally assembled, hi-pot tested, and typically shipped within two business days after purchase. In addition to DX Engineering branded cable, you can order customized Times Microwave Systems® LMR®-400, LMR®-400UF, LMR®-400DB, LMR®-600, LMR®-600UF, and LMR®-600DB cable assemblies. Also available is DX Engineering Tinned Copper Braid for safely grounding your stations.
Ready to upgrade? Check out this OnAllBands article: Everything You Wanted to Know About Coax but Were Afraid to Ask
Stay tuned! OnAllBands will be featuring more Field Day essentials leading up to the big weekend, including:
- Tool kits for preparing your coaxial cable
- Power supplies
- Headsets
- LiFePO4 battery and charger combos
- Wire antennas
- Foldable and rollable solar panels
The post Guide to Prepping for ARRL Field Day 2026: Part 1, Coaxial Cables appeared first on OnAllBands.
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IK8VRQ/ID9 & IK8QQM/ID9 – Stromboli, EU-017
[INFO by Angelo, IK8VRQ] – During the weekend of June 6-8, my friend Gino IK8QQM and I will be active from the island of Stromboli, IOTA EU-017. We will work in QRP mode HF bands & 6m. If the weather and the activities of the volcano allow, we will also carry out a short POTA […]