Unleash the Kraken(SDR): 5-Channel Coherent Capable RTL-SDR Coming Soon (Direction Finding, Passive Radar)

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Back at the end of 2018 we successfully crowdfunded KerberosSDR on Indiegogo which was our first coherent capable RTL-SDR that consisted of four RTL-SDRs on a common clock, with built in noise source and phase synchronization hardware. KerberosSDR enabled interesting experiments such as radio direction finding and passive radar to be implemented at a much lower cost.

KerberosSDR has taught us many things, and we’re now working on the next iteration which will be a significantly refined version known as “KrakenSDR”. KrakenSDR will be a five channel common clocked RTL-SDR, with built in noise source and automatic phase synchronization hardware.

KrakenSDR will be crowdfunded on CrowdSupply, and we currently have a pre-launch page active at crowdsupply.com/krakenrf/krakensdr.

Please sign up to the CrowdSupply KrakenSDR email list on the Crowdsupply page to be notified once crowdfunding is launched so that you will be sure to catch the early bird pricing discounts. We expect to be able to launch sometime within the next two months.

KrakenSDR Prototype with 5-Magnetic Whip Antennas

Unlike KerberosSDR, KrakenSDR has built in switching hardware that when combined with the new software, will automatically achieve sample and phase calibration without needing to manually disconnect the antennas each time the unit is powered up, or each time the frequency is changed. This allows for much easier mobile and remote use scenarios.

The addition of the fifth tuner also allows us to use a five element antenna array, which results in much improved direction finding accuracy and better multipath rejection. USB-C is also now used on both ports for greater port reliability, the PCB has been redesigned for lower noise, software controlled bias tees are present on each port, and it comes in a tough CNC milled enclosure that doubles as a heat sink.

Finally there is a new open source software base which uses the new synchronization hardware to perform auto phase calibration, allows for intermittent signals to be squelched and tracked, enables long term phase synchronization monitoring, and enables new possibilities for future code expansion especially for passive radar which we will be testing in the upcoming months.

Below are three videos demonstrating the KrakenSDR in action. Please subscribe to the KrakenSDR YouTube channel for more upcoming demonstrations.

KrakenSDR Radio Direction Finding Compass Test 1
KrakenSDR Radio Direction Finding Retune with Autocalibration Test 1
KrakenSDR Vehicle Radio Direction Finding Demonstrations

If you haven’t seen them yet, it may also be interesting to watch our old KerberosSDR videos as well in the playlist below.

KerberosSDR Radio Direction Finding: Heatmap + Auto Navigation to Transmitter Location Demo 1

Some of our previous KerberosSDR posts might also be of interest.