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KerberosSDR – A 4-Channel Phase Coherent RTL-SDR for Passive Radar, Direction Finding and More!
The RTL-SDR software defined radio phenomenon has changed the world by unlocking low cost access to the radio spectrum. Whilst RTL-SDR is now a relatively mature commodity item that almost everyone whose tinkered with electronics has played with, there is still so much more potential to be unlocked.
A phase coherent RTL-SDR can be made out of two or more RTL-SDR dongles that share a common clock. With a bit of help from a noise source, the RTL-SDRs can be synced together. Once synced interesting applications become available, such as direction finding, beam forming and passive radar.
Phase coherent RTL-SDRs have been worked on and demonstrated several times over the past few years, but at RTL-SDR.com we've been disappointed to find that so far there hasn't been any easy way to replicate these experiments.
The required hardware has been difficult to build and access, and the software has been kept as unreleased closed source or has been too complicated to install and use.
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Answers prepared with AI from staff replies and reviewed by SDRstore.
You can start experimenting with just two antennas for a 2-RX passive radar demo. Passive radar using reference and surveillance channels can use two directional antennas. Full 4-channel direction finding or beam-forming requires four omni-directional antennas, such as magnetic whips. For passive radar with a drone, use two reference antennas and two surveillance antennas.
Verified by SDRstore · 11/01/2026Yes, KerberosSDR can track a drone transmitting RF, such as telemetry or control signals. For direction finding, connect four antennas and run the AoA demo for live bearings. For passive radar, point two reference antennas at an FM or TV transmitter and two surveillance antennas at the drone; echoes can then appear. No extra devices are needed beyond KerberosSDR and the antennas. Accuracy depends on signal strength and antenna layout.
Verified by SDRstore · 11/01/2026Search includes the FAQs and questions displayed on this page. Use pagination to see older questions.
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