A DATV (digital amateur television) transmitter is installed in the Columbus module of the International Space Station (ISS). This transmitter is dubbed “Ham Video”.
Main characteristics :
Ham Video operates with a Canon XF-305 camera.
Commissioning of the Ham Video transmitter was performed April – March 2014. All four frequencies and two symbol rates were checked with each of the two antennas.
For each commissioning step, US astronaut Michael Hopkins transmitted video and audio during a pass over the Matera ground station. The Matera VLBI station is located at the Italian Space Ageny’s ‘Centro di Geodesia Spaziale G. Colombo’ (CGS) near Matera, a small town in the south of Italy.
The final commissioning test was performed by JAXA astronaut Koichi wakata, using configuration 4 for optimum results:
The signals were received by several ground stations and streamed to the BATC server (British Amateur Television Club).
Ham TV streams are identified ISS1 – 5. The BATC server is available at http://www.batc.tv
When "Blank Transmission" is operational, Ham Video transmits a continuous DATV signal with the camera turned off. Ground stations receive a black image and audio at zero level. This Blank Transmission will go on till August 6, 2014.
A « blank » DVB-S signal contains all the data of normal DVB-S. The information tables describing the content and the content itself, i.e. the video (black) and the audio (silence), are the same as for the image and the sound produced by a camera.
Receiving a black image and silent sound may seem uninteresting but, from a technical perspective, the digital signal offers an important source of information.
Even without decoding, several measurements of the received signal provide valuable information:
Ground stations with S-band capability can provide valuable information.
Basic data such as:
can be reported by ground stations without the need of DATV hard- and software. A reporting facility is available here : Ham Video Reporting
Windows computer with TechnoTrend TT S2-1600 card and Tutioune software
A Windows computer with TT S2-1600 receiver card can be used for Ham Video reception.
The Tutioune software, developed by Jean Pierre Courjaud F6DZP, measures and records the Ham Video signals second per second:
The recorded file can be examined and forwarded to ARISS.
Better even, the data can be forwarded during an ISS pass to the TiouneMonitor on the www.vivadatv.org website. In other words, the data can be observed worldwide, real time.
Tutioune also shows the constellations during signal reception (see HamTV Bulletin #4). The TS stream can be recorded, but this is less interesting since richer information is already available.
Tutioune also decodes the DVB tables and provides the PIDs and the channel name (« HAMTV ») recovered from theSDT table.
ARISS ANTENNAS INSTALLED
1. Columbus : the main European contribution to the International Space Station (ISS)
Mankind's outpost in Space, the International Space Station, is a common scientific exploration effort of 16 nations: the United States , Canada , Japan , Russia , 11 nations of the European Space Agency ( Belgium , Denmark , France , Germany , Italy , the Netherlands , Norway , Spain , Sweden , Switzerland , United Kingdom ) and Brazil .
Several modules have already been installed: Zarya (the Russian functional cargo block), Swesda (the Russian service module), Destiny (the American laboratory). These modules constitute a pressurized ensemble.
The European Space Agency (ESA) is presently building Columbus , a Space laboratory, which will be attached to the ISS in the near future.
2. Amateur radio on the International Space Station (ARISS)
The first element of the ISS, Zarya the Functional Cargo Block, was launched from Baïkonour , Kazakhstan in 1998. Two years later, the ARISS initial station gear went into space and William Shepherd--who dubbed the ISS "Space Station Alpha"--made the first ARISS school group contact on December 21, 2000 .
As the Space Station grows, the amateur radio station on board also evolves. The initial ham station Phase 1 is located on Zarya and ham station Phase2 is located on Swesda, both on Russian territory.
During several EVA's (Extravehicular Activities), four antennas have been fixed on handrails outside Swesda. The primary function of these antennas is to provide microwave communications for the astronauts when they work outside the ISS. These antennas are multiplexed to antenna elements covering several amateur radio bands, HF, VHF, UHF and L-band.
Presently the amateur station is running as Packet Radio (VHF) or as FM crossband repeater (VHF downlink, UHF uplink).
Licensed astronauts and cosmonauts also use the VHF station for QSO's with amateur radio ground stations.
Most significant is the use of the VHF station for educational outreach. ARISS has developed a very efficient organisation for setting up School Contacts, allowing students and schoolchildren to ask questions to astronauts and get their answer direct from Space. Volunteering amateur radio operators provide the ground station for the selected school when a contact is scheduled. In principle, NASA allows one contact per week. ARISS-Europe has also an arrangement with ESA for European astronauts and a similar agreement is under discussion with Energia, the Russian Space agency. ARISS School Contacts energize youngsters' interest in science, technology, and learning. In Germany and in France , participating students have become licensed radioamateurs. Moreover these radio contacts are widely covered by the news media and contribute to show the general public a positive image of amateur radio.
3. An amateur radio station on Columbus
November 2002, ARISS Europe extended a request to ESA's Directorate for Manned Space Flight and Microgravity, asking for ham radio facilities on the European Space Laboratory. In 2003, ESA's Columbus division agreed on the principle. October 2007, the antennes have been installed on the module.
Columbus will be transported in the bay of an American Shuttle. Therefore, since little room is left between the module and the Shuttle bay, the ARISS antennas are patch antennas, flat planes ten millimeters thick.
The patch antennas are fixed on the Meteorite Debris Panels (MDP) protecting the hull of Columbus. On the port cone of the module, where it attaches to the ISS main structure, feedthroughs have been installed for the ARISS antennas and coax cables are run from the feedthroughs to the nadir.
The development of the antennas has been taken care of by the Institute of Telecommunications and Acoustics of the Wroclaw University of Technology. The Columbus antennas will work on L-band and S-band. UHF was initially considered also, but was abandoned by lack of funding.
4. The benefits of adding ARISS antennas to the Columbus module
The existing ARISS antennas on the Service Module are shared through diplexers and will not be especially effective on the microwave bands. Using the dedicated antennas on Columbus will, for the first time, permit viable ARISS operations on these useful bands.
With the Columbus module being located at some considerable distance from the other two ARISS stations, this will permit parallel operations on the new bands at the same time as the existing operations.
The availability of these new frequencies will enable us to establish wideband and video operations for the first time. This facility will provide ATV facilities for School contacts and, additionally, continuous transponder operation.
The Columbus module is designed to undertake experiments but may also be used as temporary sleeping accommodation for the European astronauts. It is anticipated that most, if not all of them, will be licensed amateurs.
To summarise, the addition of these new antennas will provide greatly enhanced opportunities for amateur radio operations on the ISS and an additional emergency communication facility for the astronauts.
5. Funding the ARISS antennas on Columbus
The construction of Columbus has reached its final stage. The ARISS antennas have been installed in October 2007. A most important aspect has still to be solved : funding.
The installation cost of the ARISS antennas on Columbus exceeds 100.000 euro (coaxial feedthroughs, coax cables on the hull of the module, etc.). ESA initially offered to support 50.000 euro of this amount. Presently ESA has decided to cover the installation cost completely .
The Wroclaw University of Technology has obtained a special funding for the ARISS antennas from the Polish Ministry of Research and Development. This helps cover the total cost and limits our effort to 86.000 euro.
69.000 euro has already be paid by ARISS.
We still have to pay 17.000 euro to finish the work.
Presently our goal has been set to 100.000 euro, but it will most probably be reconsidered. After Columbus is attached to the ISS, we will still need to build the onboard equipment.
6. Call for donations
ARISS-Europe renews the call for donations to the IARU and AMSAT societies as well as to their members individually.
A financial account has been opened by AMSAT Belgium. Donators within the European Union will not have to pay any additional banking costs (beyond the costs of a national money transfer) if they use the following international banking number (IBAN) and mention the international identification code (BIC):
IBAN BE63 0012 3065 9208
Without any additional cost for international money transfer, even the smallest donation is useful and will be most appreciated.
Please don't forget to reference the transfer as “ Donation Columbus ”.
If you have a PayPal account you can easily make a donation by using the "Donate" button in the left column.
Even if you don't have a PayPal account you can use your creditcard to make a Paypal donation for the Columbus project.
Simply click the "Donate" button and follow instructions.
On the ARISS-Europe website a special Columbus page has been added.
Donations are listed from societies as well as from individuals.
Taking into account the regulations on privacy protection, donations are listed as anonymous, unless the donator states his identity as reference for the transfer.
This list is permanently updated and distance from the target shown.
On behalf of all the volunteering parties involved in the project, we extend thanks to all donators.
This is a great goal for amateur radio at its best.
October 20, 2007
Gaston Bertels, ON4WF