D-STAR ONE

communication & amateur radio satellite


D-STAR ONE Sparrow is now in orbit

The first contact was confirmed by K4KDR and EU1SAT

Thank you Scott and Vladimir!

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The world’s first D-Star message from space was received on 29.12.2018 by DK3WN

Thank you Mike for your support!

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The D-Star.ONE repeater function was tested and confirmed on 07.01.2019 by VK3VCL

Wayne Bruce from Melbourne was the first who used the repeater of D-Star.ONE


D-Star ONE Sparrow (DP1GOS) halfduplex repeater & beacon frequencies:

Uplink: 437,325MHz / Downlink: 435,525MHz RF-Power: 800-1200mW



D-Star One is a 3U CubeSat which is equipped with four identical radio modules with D-Star capabilities, all being operated in a half-duplex mode.

Two modules are used for telemetry and telecomand and operate on identical frequencies. Telemetry can be received on 435,7 MHz, the format will be disclosed after launch. Both modules receive, and both modules answer. To prevent information loss, they answer after each other. So each telemetry frame is repeated twice. Both modules have a D-Star Voice-Message Beacon, but it is only activated for one module during LEOP. The Beacon is repeated once in a minute.

The other two modules are dedicated to the radio amateur community. Both modules have the same frequencies, so one of them will be powered down as long as the other one shows no degradation effects. The downlink frequency is 435.525 MHz and the uplink frequency is 437.325 MHz. Also here half-duplex mode is applied. The modules are configured to work as D-Star repeaters, so they retranslate the received d-star frames on the downlink frequency. They also have a D-Star voice beacon signal.

All modules are operated in a power save mode. This means that they are in idle for 40 seconds and then in receive mode for 20 seconds. Once a signal has been received, the modules switch to receive mode for five minutes. So it might be necessary to „ping“ the satellite a couple of times until an answer is received.


Welcome to the official
D-STAR ONE project website

D-Star ONE is the first private german CubeSat and the first D-Star communication spacecraft wordwide.


The D-Star ONE Sparrow is launched

Launch vehicle: Soyuz-Fregat

Telemetry beacon is working on 435.700 MHz

Data format: 4k8 GMSK Mobitex (CMX990 Mobitex Format), Frame head (Hex): CC CC 57 65 71 06 XX(fec) following by 6 mobitex data blocks
Telemetry frame format

Now we turn on the D-Star module for the first tests

Next D-Star mode activation: ---; Downlink 435.525MHz; Uplink 437.325MHz

Our teams were actively working together during the year, and we are happy to announce that today we have completed the assembly and final checks of the D-Star ONE (Sparrow) satellite.

The D-Star ONE project is highly important for the whole GOS and iSky teams. We also express our deep gratitude to our main launch provider, ECM Space Technologies GmbH. The Soyuz-2/Fregat launch system will launch from the Vostochny launch site on December 27, 2018 and bring the D-Star ONE (Sparrow) in the space!

D-Star ONE D-Star ONE D-Star ONE


D-Star ONE D-Star ONE D-Star ONE


ECM launch services ECM launch services
D-Star ONE

Orbit parameters and TLE:

The orbit for the D-Star ONE spacecraft is a circular sun synchronous orbit with an altitude of approx. 585km

The D-Star ONE (Sparrow) spacecraft was launched 27.December 2018.


Preliminary TLE:

1 43879U 18111D 19011.93279987 -.00000037 00000-0 18871-5 0 9990

2 43879 97.7264 282.1438 0012929 185.9498 174.1572 14.95864938 2357

This website is under development. Please check back soon for more content!

Please use this e-Mail for requests: info@d-star.one

Our D-Star ONE team is happy to support you.