Hej!
Vi körde ett litet nät idag på 3740 KHz klockan 10.00
*HAM TV igång på Rymdstationen.
ISS HamTV Success (3-8-2014)
On Saturday, March 8 test transmissions were made on 2422.0 MHz
using the HamTV equipment on the International Space Station (ISS).
The Digital TV signal was successfully received and web streamed to
a global audience via the Britsh Amateur Television Club (BATC)
server at http://batc.tv/ch_live.php?ch=4 There were four live web
streams each from different receivers.
The HamTV transmitter is the culmination of over ten years work by
dedicated volunteers to establish an amateur radio TV transmitter on
the ISS. It uses patch antennas fixed on the Meteorite Debris Panels
(MDP) protecting the hull of the ISS Columbus module. These antennas
were installed while the Columbus module was being constructed. A
fund-raising campaign took place during 2005-7 to raise over 65,000
Euros for the antennas. Individual radio amateurs from around the
world donated generously as did several organisations including AMSAT-
UK and the RSGB.
The main mission of HamTV is to perform contacts between the
astronauts on the ISS and school students, not only by voice as now,
but also by unidirectional video from the ISS to the ground.
HamVideo is the name of the onboard DATV S-band transmitter. HamTV
is the name of the complete system, comprising DATV downlink and VHF
voice uplink. Kaiser Italia SRL was the prime-contractor for the
design and development of the flight and ground segment
http://www.kayser.it/index.php/exploration-2/ham-tv
Read the HamTV overview by Gaston Bertels ON4WF
http://tinyurl.com/HamTVoverview
Join the ISS HamTV Yahoo Group
http://groups.yahoo.com/group/HamTV
Webstream of the TV transmissions
http://batc.tv/ch_live.php?ch=4
ARISS-EU HamTV Bulletins
http://www.ariss-eu.org/
HamTV on Facebook
https://www.facebook.com/Hamtvproject
ISS Ham Video now installed and ready for commissioning (3-6-2014)
The Ham Video transmitter was installed in the Columbus module of
the International Space Station (ISS) on March 6, 2014 at
approximately 10.00 UT.
The transmitter was powered on briefly and all control LEDs were
nominal. Ham Video is declared ready for Commissioning.
The first Commissioning step is planned March 8, 2014. Using call
sign OR4ISS, crew will power on the Ham Video transmitter in
configuration 1:
– ARISS antenna 41
– Frequency 2.422 GHz
– Symbol rate 1.3 Ms/s
The transmission will start shortly before the pass of the ISS over
Western Europe at approximately 13.27 UT.
Acquisition of signal (AOS) at Matera ground station in south Italy
will be at approximately 13.29 UT.
Matera will receive the Ham Video signals with 3 different
receivers. The output of each receiver will be web streamed over BATC
channels ISS1, ISS2 and ISS3.
The ARISS ground station IK1SLD, located in Northern Italy, will
also receive the Ham Video signals and stream the video over BATC
channel ISS4.
*AO-73 Funcube
FUNcube-1 (AO-73) 100+ days in orbit
Last weekend FUNcube-1 (AO-73) reached the milestone of having been
in space for 100 days ? actually that should be clarified to mean
?terrestrial? days as the spacecraft itself has been subjected to
more than 1500 day/night cycles during this time.
We are very grateful to the 500+ stations who have been providing
FUNcube-1 telemetry data to our Data Warehouse. We now have more than
1GB of data in the repository ? this is an amazing effort and
achievement from a spacecraft which is only transmitting at 1200bps.
Thanks everyone and please keep it coming:)
From all the telemetry we can see that the spin rate decreased for a
time but now is speeding up again. External temperatures span a range
of 50C between the end of the sunlit phase and the end of the eclipse
period. Even inside the spacecraft the temperatures range over 25C.
All the subsystems continue to work well and are ?well in the green?.
The increased solar activity is certainly having an effect on the
downlinked signal on many occasions. During such disturbances the
signal appears to be being affected by ionospheric scintillation
which distorts the BPSK stream and makes decoding much harder for
some minutes at a time. This effect is not just apparent near the
magnetic poles as can be seen in this paper:
http://waas.stanford.edu/papers/IWG/sbas_iono_scintillations_white_pap
er.pdf
Users in the Northern hemisphere will have noticed that the evening
passes in amateur mode are becoming shorter as the spacecraft enters
sunlight again near the pole. This effect will increase as the season
progresses and we will be testing a plan to change the operating
schedule in a few weeks time. This test will involve placing the
spacecraft into continuous amateur/transponder mode for a number of
orbits ? probably over a weekend.
Especially for educational users of FUNcube, we have placed all our
schools outreach material on one page for easy reference. It can now
all be found here:
http://funcube.org.uk/education-outreach/
*Massutsläpp av satelliter
The largest ever launch of 437 MHz satellites is planned for March
16 at 0841 UT when 128 Sprite satellites will fly on the SpaceX
Falcon 9 CRS 3 mission to be deployed into a 325?315 km 51.5 degree
inclination orbit. You should be able to watch the launch live on
NASA TV.
The project was originally conceived by AMSAT-UK member Michael
Johnson M0MJJ at Cornell University. Michael was the first project
manager who specified many aspects of the project, making it
technically and financially viable. He left the project in 2012 to
found PocketSpacecraft.com.
A Sprite is a tiny, 3.5 by 3.5 cm, single-board spacecraft that was
developed by Zac Manchester KD2BHC.
Each Sprite has a microcontroller, radio, and solar cells and is
capable of carrying single-chip sensors, such as thermometers,
magnetometers, gyroscopes, and accelerometers.
The 128 Sprites are carried in a 3U CubeSat called KickSat. They are
stacked atop a spring-loaded pusher and secured by a nichrome burn
wire system.
On reaching orbit KickSat will perform a de-tumble maneuver and
establish communication with Cornell University?s ground station.
After check-out, the spacecraft will be put in a sun-pointing
attitude and spun up to maintain that attitude.
A command signal from the ground station will then trigger the
deployment and the Sprites will be released as free-flying
spacecraft. After deployment, telemetry and sensor measurements from
the individual Sprites will be received through Cornell?s ground
station in Ithaca, NY, as well as several other amateur ground
stations around the world.
Due to the low orbit Sprites will have a short lifetime before they
reenter the atmosphere and burn up. In the best-case scenario the
orbital lifetime could be six weeks but realistically it may be
considerably shorter depending on atmospheric conditions, maybe a
matter of days.
All the Sprites operate on a single frequency of 437.240 MHz and use
Code Division Multiple Access (CDMA). The transmitter runs 10 mW
output of Minimum Shift Keying (MSK) modulated binary data with each
data bit modulated as a 511 bit Pseudo-Random Number (PRN) sequence.
The ITU emission designator is 50K0G1D.
The KickSat CubeSat has downlinks on 437.505 MHz and 2401-2436.2 MHz.
KickSat Sprite Ground Station by Andy Thomas G0SFJ
http://kicksat.wordpress.com/support/kicksat-ground-station/
British Interplanetary Society: Sprite Technical Summary
http://www.bis-space.com/2013/03/09/9301/kicksat-technical-summary
KickSat project information
http://zacinaction.github.io/kicksat/
BBC Worldwide TV interview with Zak Manchester KD2BHC. Unfortunately
this is censored in the UK only overseas viewers can see it. A proxy
server may be a way around it.
http://www.bbc.com/future/story/20140128-the-smallest-spacecraft-in-
orbit
Check this site for the latest CRS 3 launch date
http://spaceflightnow.com/tracking/
Pocket Spacecraft
http://www.pocketspacecraft.com/
*Årsmöte
Som Lars tidigare informerat så kör vi årsmöte på onsdag.
73 Håkan SM7WSJ
