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Author Topic: Ham Video on the ISS - Update  (Read 2006 times)
K6LCS
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« on: September 20, 2013, 11:27:53 AM »

Ham Video Campaign 2013

The ARISS DATV transmitter, dubbed  "Ham Video," already onboard
the International Space Station, will soon be installed in the
Columbus module and commissioned.

Commissioning will be done in several steps, each during a full pass
of the ISS over the Matera ground station. It is not yet known if
these passes will be chosen in close succession, or if they will cover
several weeks. ARISS proposes ESA to operate so called “blank”
transmissions during the commissioning period. If this is accepted, it
means that Ham Video will transmit permanently without camera. The
camera will not be used because it is fed on batteries and servicing
it would need prohibitive crew time. Transmitting recordings is part of
a future project, but not available presently.
 
Although ground stations will receive a black image without audio,
“blank” transmissions contain all information needed for the setting up
and the fine tuning of the station. Moreover, collected data will be
used for a performance study of the ARISS L/S-band antennas as well
as for an evaluation of the global system.

For this launch campaign, ARISS addresses a call for collaboration to
the amateur radio community, especially to the operators interested in
space communications. Several satellite operators have shown interest.

Ham Video technical characteristics are available at www.ariss-eu.org .
Look for the “Ham Video” link in the left sidebar. Suggestions and useful
addresses  for the setting up of a Ham Video ground station are also
provided.

Among the components of  a satellite ground station, the antenna
system is the most expensive. High gain antennas are needed, moved
by azimuth and elevation motors and driven by an appropriate computer
program. For Ham Video reception, a 1.2m dish with precision tracking is
recommended. A station compliant with the recommendations provided in
the aforementioned reference text should be capable of 3 to 4 minutes of
DATV reception during a pass of the ISS. AO-40 operators who still have
an S-band dish can now use it for Ham Video.

On the other hand, interesting data can be gathered by stations with a
much simpler setup. A dish with a self made helix feed could be used without
motors. This antenna could be positioned in a fixed direction, determined
before a pass of the ISS, pointing to the position of the ISS at closest
approach, which corresponds to the maximum elevation of the space station
during the pass. With the setup as described hereunder, 1 to 2 minutes of
solid reception of the Ham Video signal should be possible.

Call for participation to the Ham Video launch campaign

ARISS addresses a call to amateur radio experimenters who would like to
participate to the Ham Video launch campaign.

Data gathering during the initial “blank” transmissions is important and the
help of volunteering operators will be most appreciated. More details to follow.

It is to be noted that builders of the hereunder proposed “Simple Station”
could later update their equipment and add tracking motors. Chained stations
will be needed for ARISS Ham TV school contacts. Video and audio from the
ISS will be web streamed to the schools over the Internet.
 
We will keep you informed of these developments. For the time being, as a
starter, let us concentrate on receiving “blank” transmissions.

73,
Gaston Bertels – ON4WF
ARISS-Europe chairman

/end/
Logged

Clint Bradford, K6LCS
http://www.work-sat.com
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