Linear transponder CubeSat to deploy from ISS

Masa JN1GKZ reports JAXA has announced three CubeSats, Irazu (Costa Rica), 1KUNS-PF (Kenya) and UBAKUSAT (Turkey)  will deploy from the International Space Station on Friday, May 11 between 1030-1040 GMT.

All the CubeSats carry amateur radio payloads, Irazu and 1KUNS-PF have telemetry beacons while UBAKUSAT carries a linear transponder for amateur radio SSB and CW communications in additional to CW and telemetry beacons.

Update May 12, 2018: Signals from all three satellites were successfully received during May 11.

The deployment will be broadcast live on YouTube, watch from 1000 GMT Friday, May 11.

Irazu is a 1U CubeSat developed by students at the Costa Rica Institute of Technology
Telemetry Beacon 9600 bps 436.500 MHz

1KUNS-PF is a 3U CubeSat developed by students at the University of Nairobi
Telemetry Beacon 1200 bps or 9600 bps 437.300 MHz

UBAKUSAT is a 3U CubeSat developed by students at the Istanbul Technical University
CW Beacon 437.225 MHz
Telemetry Beacon 437.325 MHz
Linear Transponder
• 435.200-435.250 MHz downlink
• 145.940-145.990 MHz uplink

Source Masa JN1GKZ Tokyo Japan

IARU Satellite Frequency Coordination Status

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

Turkish Amateur Satellite Technologies Organization (TAMSAT)