Radio amateurs around the world have been listening for signals from the four new amateur radio CubeSats that were deployed from the ISS on Thursday, October 4.
The small satellites were transported to the ISS in the HTV-3 (Kounotori 3) cargo vessel that blasted off on an H-IIB rocket from the Tanegashima Space Center on Saturday, July 21 at 0206 UT.
The cargo vessel arrived at the ISS on July 27 and the ISS Canadarm2 robotic arm was used to install the HTV-3 to its docking port on the Earth-facing side of the Harmony module at 1434 UT. The CubeSats were then unloaded by the Expedition 32 crew
The CubeSats were mounted in a JEM-Small Satellite Orbital Deployer (J-SSOD). In one pod were TechEdSat, F-1 and FITSAT-1 while in the second pod were WE-WISH and a scientific CubeSat RAIKO.
Japanese astronaut Akihiko Hoshide KE5DNI put the J-SSOD into an airlock, which was depressurised and exposed to the vacuum of space via an automatic door. The Kibo robotic arm was then be used to grapple the J-SSOD in the airlock and move it out away from the station so the satellites could be deployed.
WE-WISH and RAIKO were first to deploy at 1437 followed by TechEdSat, F-1 and FITSAT-1 at 1544 GMT. They could have a life-time of 4 or 5 months before they burn-up in the Earth’s atmosphere.
FITSat-1, built by students at the Fukuoka Institute of Technology, has several downlinks a CW beacon on 437.250 MHz, 1200 bps AX.25 packet radio on 437.445 MHz and a high-speed (115.2 kbps) data transmitter on 5840.0 MHz. Additionally there is an optical communications experiment comprising a bank of high power LEDs that will be driven with 200W pulses to produce extremely bright flashes that may be visible to the unaided eye of observers on Earth.
F-1 was built by the FSpace team of young engineers and students at the FPT University in Vietnam. The satellite’s callsign is XV1VN and the communications subsystem is built around two Yaesu VX-3R amateur radio handheld transceivers. One will transmit 1200 bps packet radio every 30 seconds on 145.980 MHz while in darkness. The other will operate only in sunlight sending a 20 second FM transmission of a CW tone on 437.485 MHz followed by a 60 second gap.
TechEdSat, built by students at the San Jose State University, carries a 1200 bps packet radio transmitter on 437.465 MHz.
WE-WISH, from the Meisei Amateur Radio Club, has an infrared camera for environmental studies. The 320 by 256 pixels images of the Earth’s surface will be transmitted in approx 110 secs using SSTV. The callsign is JQ1ZIJ and the 100mW downlink on 437.505 MHz can operate in CW (A1A), AX.25 1200 bps packet radio (F2D) or SSTV (F3F). Reports indicate the frequency may be 9 kHz high at 437.514 MHz.
It should be possible to receive the Cubesats on up to 6 passes each day. Due to the effects of Doppler shift the 437 MHz downlink frequencies will vary by +/- 10 kHz during an 8 minute pass.
Previous deployments of amateur radio satellites have only been possible when astronauts have performed an Extravehicular Activity (EVA). The Kibo robot arm and the J-SSOD could enable a larger number of satellite deployments in the future.
Further information on the amateur radio CubeSats can be found at http://www.uk.amsat.org/?p=10119
Tracking the CubeSats
Initially the CubeSats will be in virtually the same orbit as the International Space Station (ISS) and the latest ISS Keplerian Two Line Elements can be used to determine their position. See the ISS Fan Club real-time tracking at http://www.issfanclub.com/
Keplerian Two Line Elements (TLEs) ‘Keps’ for new satellites launched in past 30 days
Initial thoughts are
1998-067CS WE WISH