Central place for discussing, creating, and managing projects

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GNU Radio

Free and Open-source Radio Astronomy Software for all experience levels

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Get Involved

List of people involved and contact info for joining the project

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One of the main goals of Open Source Radio Telescopes is to provide resources and documentation to students, teachers, and hobbyists who are interested in building radio telescope projects. Here is a list of projects that OSRT members have created instructions and documentation for:

Small Loop Antenna

This simple loop antenna is a great beginner’s project to learn about electronics as well as astronomy.  It may be used to monitor Sudden Ionospheric Disturbance (SID) events caused by solar activity.  Here are some blog posts about the Small Loop Antenna:

Small Loop Antenna: Background and Construction

Small Loop Antenna: Electronics

Small Loop Antenna: Software and Signal Processing

Horn Antennas

DIY open source radio telescopesHorn antennas are also great introductory radio astronomy projects. This type of antenna is capable of detecting Neutral Hydrogen emissions from the Milky Way! Several versions of the horn antenna design have been developed and tested by OSRT members and Research Experience for Teachers participants. Here are some links to blog posts about two of the horn antenna designs (“Alexander” and “Bessie”) developed so far:


Introduction to the Alexander telescope project

Alexander Materials

Alexander Telescope Construction

Alexander Data Collection


Bessie Telescope Project