The coherent SDR software provides open source code for the Data Acquisition (DAQ) software used to ingest RF data from all five antenna inputs, automatically calibrate and achieve phase coherence via the switches and noise source, and provide coherent samples for the next layer. This DAQ code typically runs on a Raspberry Pi 4 or similar single-board computer (SBC) but can also run on a Linux PC. Open-source DSP code supports radio direction finding. That code implements direction-finding algorithms such as MUSIC, which can run on the same Pi 4 or PC as the DAQ code. An Application Layer uses the data from the DSP layer by plotting and logging it. Generally, programs in this layer run on a separate machine. For direction finding, a free Android app for mapping, logging data, and automatically estimating the transmitter location is provided.

　　The KrakenSDR software comes with an easy-to-use web interface for setting up direction-finding parameters. This interface allows users to set the frequency, gains, VFOs, and other advanced settings. Customers can also monitor the live-spectrum view and graphs of output from the direction-finding algorithm.

　　In addition to the web interface, a companion radio-direction-finding Android app can automatically determine a transmitter's location. Since a typical Android phone has capabilities that include necessary sensors and software like GPS, compass, mobile data, and mapping, KrakenR used those features to create an affordable radio direction-finding system. The application automatically and accurately calculates the map bearing towards the searched transmitter for that particular location. The app then logs this data and plots it on a map grid, which is used to determine where the bearings intersect automatically. Generally, it will only take a few minutes of driving to locate a transmitter with a solid continuous signal accurately. The app then goes a step further and provides automatic turn-by-turn navigation. The app is free for KrakenSDR backers to download.

　　Features

　　Five-channel, coherent-capable RTL-SDR, all clocked to a single local oscillator

　　Built-in automatic coherence synchronization hardware

　　Automatic coherence synchronization and management via provided Linux software

　　2.56MHz bandwidth

　　24MHz to 1766MHz tuning range (standard R820T2 RTL-SDR range, and possibly higher with hacked drivers)

　　4.5V bias tee on each port

　　5x channels improves-direction finding accuracy

　　Core DAQ and DSP software is open source and designed to run on a Raspberry Pi 4

　　Direction-finding software for Android (free for non-commercial use)

　　Custom antenna set available

　　Clean spectrum with low internal noise

　　Heavy-duty CNC aluminum case, 160mm x 120mm x 20mm dimensions

　　5V operating supply voltage

　　KrakenRF KRAKENANT-01 Magnetic Whip Antenna Set

　　KrakenRF KRAKENANT-01 Magnetic Whip Antenna Set is a set of five magnetic whip antennas that can be used with the KrakenSDR for direction finding. The magnets are strong enough to secure the antennas to the roof of a moving vehicle. The included cables are length-matched with a VNA to ensure as little phase distortion as possible.

　　Features

　　· For use with the KrakenSDR for direction finding

　　· Strong magnets on the antennas for mounting

　　· Length-matched cables with a VNA

　　· Very little phase distortion