UBAKUSAT linear transponder satellite

UBAKUSAT Amateur Radio CubeSat

UBAKUSAT Amateur Radio CubeSat

Turkey’s 3U CubeSat UBAKUSAT carrying an amateur radio 145/435 MHz SSB/CW transponder is planned to be deployed from the ISS in 2017.

The linear transponder is almost the same as that on the TURKSAT-3USAT which was launched on April 26, 2013.



The satellite is being developed by Istanbul Technical University, Faculty of Aeronautics and Astronautics, Space Systems Design and Test Lab (SSDTL) along with TAMSAT, GUMUSH and ERTEK Ltd, with some support of the RF lab of ITU (RFL) and Ministry of Transportation, Communication and Maritime in collaboration with the Japanese Government.

The first ever CubeSat of Turkey, ITUpSAT1 was also successfully developed by SSDTL. ITUpSAT1 was placed in a LEO orbit of 720 km, on September 23, 2009 by a PSLV rocket. Its beacon signals are still heard by amateur radio stations worldwide.

The primary mission of UBAKUSAT is to provide voice communications for amateur radio stations around the globe. Additionally the satellite will carry the TAMSAT Simplesat card which will send telemetry data, including the relative radiation data absorbed by the card, to ground stations. There is also a CW beacon.

The satellite also contains typical subsystems that are required for its successful operation: structure, EPS, batteries, solar panels, OBC, antenna.

The estimated duration of the satellite mission is about 6 to 12 months before re-entry. The launch from Japan to the International Space Station is planned for late 2016 or early 2017 and deployment from the ISS will occur sometime later.

IARU coordinated frequencies:
• 437.225 MHz CW Beacon
• 437.325 MHz Telemetry
• SSB/CW transponder:
– 145.940-145.990MHz
– 435.200-435.250 MHz

IARU satellite frequency coordination pages http://www.amsat.org.uk/iaru/

Turkish Amateur Satellite Technologies Organization (TAMSAT)

TURKSAT-3USAT to launch with V/U Linear Transponder

Preparing for TAMSAT linear transponder tests

Preparing for TAMSAT linear transponder tests

TURKSAT-3USAT is a three unit CubeSat built jointly by TURKSAT and the Istanbul Technical University (ITU).

Members of AMSAT-TR (TAMSAT), the Turkish Amateur Satellite Technologies Organisation, have designed and implemented a V/U linear transponder for the satellite to provide amateur radio SSB/CW communications. The transponder input is 145.940-145.990 MHz and the output is 435.200-435.250 MHz, there will be a CW beacon on 437.225 MHz.

TAMSAT V/U Linear Transponder Test

TAMSAT V/U Linear Transponder Test

The VHF/UHF transponder and all other subsystems, except the stabilization, are doubled for redundancy. Where possible, both COTS systems and in-house development are employed.

The power is provided using solar panels and lithium polymer batteries together with super capacitors. Satellite stabilization is accomplished using passive magnetic attitude control system with hysteresis rods. There is a camera payload to take images of the Earth.

TURKSAT-3USAT is expected to launch on April 26 at 0413 UT on a CZ-2D rocket from the Jiuquan Space Center into a 680 km Low Earth Orbit (LEO). The satellite has a de-orbiting system which will make it re-enter the atmosphere at the end of its operational life.

On February 9, 2013 TAMSAT President A. Tahir Dengiz, TA2T, and Vice-President Barış Dinc, TA7W, were at the laboratory in the Istanbul Technical University (ITU) where tests were carried out on the transponder.

TAMSAT team celebrating a successful test

TAMSAT team celebrating a successful test

Further information and pictures of the preliminary testing of the V/U transponder are at

Read the paper TURKSAT-3USAT: A 3U Communication CubeSat

Read more on the TAMSAT website which can be seen in Google English at http://tinyurl.com/TurkeyTAMSAT

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