EnduroSat One Mission

The Space Challenges program and EnduroSat are collaborating with the Bulgarian Federation of Radioamateurs (BFRA) for the first Bulgarian Radio Amateur CubeSat mission named EnduroSat One.

See the launch plan

Mission Overview

The project will include launching of 1U CubeSat from ISS (International Space Station) with goals to foster Amateur Radio’s participation in space research and communication in Bulgaria, to teach the participants in Space Challenges Program and hundreds of students from diverse Bulgarian universities (Sofia University, Technical University – Sofia, Tech university – Plovdiv and others) in practical satellite communication and to increase the popularity of BFRA among young people henceforth to enrich the Radio Amateur community in Bulgaria.


Mission Objectives

The satellite will have CW beacon which will transmit its own call sign using Morse code and telemetry beacon using AX.25 in datagram-mode. The radio amateurs will be able to listen to the satellite beacon and to receive telemetry data from the satellite on a regular basis.

Every radio amateur will be able to connect to the satellite and receive more detailed telemetry information and get a confirmation from the satellite for every established connection which will serve as QSL card.

On this webpage all the information and instructions required to connect with the satellite will be published as well as online database where all users will be able to upload the data they receive directly from the satellite. A competition will be held and a log file with all the successful communications will be published. The call sign with the most uploaded telemetry data will be announced by the satellite through its beacon.

BFRA will guide the students to experience their first space mission by connecting with the CubeSat once in orbit. They will learn satellite communication by practicing.


How to connect with the satellite

Information and instructions required to connect with the satellite and competition page with the rank of call signs with the most uploaded telemetry data will be published on this page. If you want to receive notifications via email about the mission and instructions on how to connect with the CubeSat

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Launch Plan

EnduroSat One will be embarked on the cargo resupply mission SpaceX CRS-14 to the International Space Station manifested to be launched on February 2018 from Cape Canaveral SLC-40 launch base in Florida, USA.

Let’s countdown together:

2018/02/09 22:00:00

Educational Material

During the mission, Space Challenges team will record educational video materials and will publish them online in English and Bulgarian, demonstrating satellite communication techniques and increasing the popularity of the Radio amateur society in the region.

This will be made possible by Spaceport online educational platform. Spaceport is the biggest online platform for space education in Europe https://spaceport.academy and the developed materials during EnduroSat One mission will guarantee maximum project exposure to young people.

Since, this is the first ever Bulgarian radio amateur CubeSat mission, it will undoubtedly create good practices in correct registration and launch preparation processes for future educational and radio-amateur CubeSat programs on local (Bulgarian) level.

Those good practices will be shared also on the educational platform of Space Challenges and provided to interested students and radio-amateurs, with permission from the given organizations (including IARU).

What does the satellite include?

The 1U EnduroSat CubeSat is a multipurpose platform engineered for space research and application. The EPS+ and the solar panels will ensure power supply during the mission. Two UHF Transceiver type II and the UHF deployable antenna will provide an high-reliable communication system for TT&C and data. Processing capabilities are provided by the low power consumption and high performance Onboard computer. A network of sensors and actuators will enable spacecraft control.


EnduroSat One Subsystems


It provides a simple and safe environment for payload as well as operational ability of all subsystems during the mission. All the elements are made of Aluminum 7075, pearl finishing and hard anodization (30 μm).

UHF Deployable Antenna

The antenna is designed to cover the amateur satellite band 435-438 MHz. It has a circular polarization and uses a redundant burn wire mechanism with feedback for deploying the radiating rods.

Communication Module

The two UHF transceivers will work in the frequency range 430-440 MHz with GFSK modulation. The devices are encapsulated in an aluminum shell that takes care of heat dissipation and significantly reduces the EMI.

Power Module

The EPS+ has two integrated Li-Po battery packs encapsulated inside an aluminum box. Capacity of the battery packs is 20.8Wh. Three independent channels control and monitor the solar panels for each axis.

Solar Panels

They are equipped with 2 Solar cells with 29.5% efficiency. On the PCB, a network of sensors (Gyroscope, Sun sensor, temperature sensor) and magnetorquer provide attitude determination and control system.

Onboard Computer

The OBC is a low power consumption and high performance computing platform. It is based on ARM Cortex M4 with frequency rate up to 180MHz. It has double redundancy sensors: 3-Axis accelerometers and compass.

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