Not trying to create any drama between ARISS and AMSAT, but the detailed sharing of info about this issue with ISS hardware is exactly the kind of thing I would like to see about RadFxSat-2.
It explains what happened, what has been done so far, and what will be done next, and tells us more info will be shared as they learn it. I don't think that's too much to ask for about our new sat.
73, John Brier KG4AKV
On Thu, Jan 28, 2021, 21:40 David Jordan [email protected] wrote:
*ARISS News Release No. 21-06*
*Dave Jordan, AA4KN *
*ARISS PR*
*[email protected] [email protected]*
*FORIMMEDIATE RELEASE*
*ARISS Operations Situation*
January 28, 2021
All,
Today was a tough one for ARISS. Let me explain.
As you all know, an EVA (spacewalk) was conducted yesterday to install cabling on the exterior of Columbus to support the commissioning of the Bartolomeo attached payload capability mounted on the Columbus module. On January 26, prior to the EVA, our Columbus next generation radio system was shut off and the ISS-internal coaxial cable to the antenna was disconnected from the ARISS radio as a safety precaution for the EVA. During the EVA, our current external antenna coaxial cable, installed in 2009, was replaced with another one built by ESA/Airbus with four RF connectors included, as compared to the current 2 RF connections. This change was made to allow ESA to connect ARISS and 3 additional customers to Bartolomeo, as compared to ARISS and one additional RF customer. As you might have seen yesterday, the EVA was conducted and our cable connection was swapped out. This morning, the crew restarted the radio system. Not hearing any Voice Repeater reports, we requested a switch to APRS packet. We still did not hear any downlink reports. At 1746 UTC we had a planned ARISS school contact between our certified telebridge station ON4ISS, operated by Jan in Belgium, and Mike Hopkins on ISS. No downlink signal was heard during the contact. The crew radioed down “no joy” on the contact about halfway through the contact and the Newcastle High School, Newcastle Wyoming, USA contact attempt ended.
Clearly, there is an issue. More troubleshooting will be required. It may be the new external RF cable that was installed during yesterday’s EVA. It might also be from the connect and disconnect of the interior coaxial (RF) cable. So the interior cable cannot not be totally discounted yet. The crew took pictures of the coaxial cable and connector attached to the ARISS radio inside the ISS. Because the exterior cable is a Bartolomeo cable and not an ARISS cable, we are working with ESA and NASA on a way forward. NASA has opened a Payload Anomaly Report on this issue. We have talked to both the NASA and ESA representatives. These are the same folks that worked with us on previous ARISS hardware systems as well as the ESA Bartolomeo integration initiative. We have also asked our Russian team lead, Sergey Samburov, if we can temporarily use the radio in the Service Module for school contacts until we are able to resolve this issue. As we gather more information, we will share it with you.
On behalf of the ARISS International Board, the Delegates and the entire team, I want to thank all of you for your tremendous volunteer support to ARISS. We WILL get through this and be more resilient as a result.
73, Frank
Frank H. Bauer, KA3HDO
ARISS-USA Executive Director
ARISS International Chair
ISS Ham Radio Program Manager & PI
*ARISS – Celebrating 20 Years of Continuous Amateur Radio Operations on the ISS*
About ARISS:
Amateur Radio on the International Space Station (ARISS) is a cooperative venture of international amateur radio societies and the space agencies that support the International Space Station (ISS). In the United States, sponsors are the Radio Amateur Satellite Corporation (AMSAT), the American Radio Relay League (ARRL), the ISS National Lab-Space Station Explorers, and NASA’s Space Communications and Navigation program. The primary goal of ARISS is to promote exploration of science, technology, engineering, the arts, and mathematics topics by organizing scheduled contacts via amateur radio between crew members aboard the ISS and students. Before and during these radio contacts, students, educators, parents, and communities learn about space, space technologies, and amateur radio. For more information, see www.ariss.org
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Media Contact:
Dave Jordan, AA4KN
ARISS PR
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