The software-defined radio (SDR) community is buzzing with excitement following the official release of the HydraSDR RFONE, a compact yet powerful SDR receiver designed to push the boundaries of affordable and flexible radio technology.
Developed by a team of radio enthusiasts and engineers under the HydraSDR banner, the RFONE combines high performance, portability, and open-source firmware support, making it a standout tool for amateur radio operators, researchers, and digital signal experimenters.
Compact Yet Capable
At the heart of RFONE is an NXP LPC4370 triple-core MCU (1× Cortex-M4F + 2× Cortex-M0 @ 204 MHz) paired with a 12-bit ADC running at 20 MSPS (with IQ outputs of 10/5/2.5 MSPS, delivering 10.4 ENOB and 64 dB SNR). With a form factor no larger than a credit card, the RFONE is built for versatility. It connects via USB-C (USB 2.0 High Speed) and integrates seamlessly into SDR setups for portable or fixed applications.
Open-Source Focus
While the hardware schematics remain proprietary, HydraSDR has fully open-sourced the firmware and software via its GitHub repository. This approach encourages modification, learning, and community-driven development, while ensuring stability and support for major SDR frameworks such as GNU Radio and SDR++.
“Our goal with RFONE was to empower radio enthusiasts with an affordable SDR platform that doesn’t compromise on performance,” said one of the project leads in an online Q&A. “We’re excited to see how the community adopts and evolves it.”
Broad Frequency Coverage
The RFONE covers a wide frequency range from 24 MHz to 1800 MHz, thanks to its integrated RF front-end and band-pass filtering. Optional low-band transverter support extends coverage into HF and VLF ranges, making the device suitable for diverse applications—from FM broadcasting and satellite reception to spectrum analysis and digital mode monitoring.
HydraSDR RFOne: A Technical Overview and Comparison with Airspy R2
HydraSDR RFOne: A New Contender in the SDR Market Challenges the Airspy R2