The HydraSDR RFOne appears to be very closely based on the Airspy R2 design, and it has very similar specs, including a 24-1800 MHz RX range, 12-bit ADC, and up to 10 MSPS sampling rate output, giving 9 MHz of spectrum.

While HydraSDR is very similar to the Airspy R2 in design, as it uses the same main LPC4370 and the same overall design and layout, there are a few minor changes. The HydraSDR RFOne uses a Rafael R828D tuner chip, instead of the Rafael R820T2 tuner. The R828D has three input pins; however, it appears that only one pin is connected to the SMA input port. The other two ports are connected to uFL connectors on the PCB, which are inaccessible from the metal enclosure.

A second interesting feature is that it comes with a much larger enclosure that can house up to three HydraSDR boards in one. Also, a USB-C connector is used instead of the microUSB (we note that the device would still be USB2.0, not USB3.0).

Hydra with a single board

Hydra with a three boards

Hardware Overview:

Package Includes:

• 1 x HydraSDR RFOne