Supported SDRs

Status legend:

• ✅ Tested on-air — at least one community contributor has a recorded QSO or reception report.
• 🧪 Tested flowgraph — flowgraph runs end-to-end, no on-air QSO yet submitted.
• 📝 Planned — on the v0.2 / v1.0 roadmap but not yet validated.
• ❓ Needs help — the SDR should work via SoapySDR; nobody's confirmed yet.

SDR	Driver	HF	VHF	UHF	Status
RTL-SDR v3 / v4	rtlsdr (SoapyRTLSDR)	via upconverter / direct-sampling-mod	✅	✅	✅ (v0.2)
Airspy R2	airspy	via upconverter	✅	✅	🧪
Airspy Mini	airspy	via upconverter	✅	✅	🧪
Airspy HF+ Discovery	airspyhf	✅	✅ (30 MHz–260 MHz)	—	✅
HackRF One	hackrf	✅	✅	✅	🧪
ADALM-Pluto	plutosdr	≥ 325 MHz stock / mod below	✅	✅	🧪
SDRplay RSP1A	sdrplay (SoapySDRPlay3)	✅	✅	✅	🧪
SDRplay RSPdx	sdrplay	✅	✅	—	📝
LimeSDR Mini 2.0	lime	≥ 10 MHz	✅	✅	❓
USRP B200mini	uhd	✅	✅	✅	❓
KiwiSDR (remote)	kiwisdr	✅	—	—	📝
RSPduo	sdrplay	✅	✅	✅	📝
Ettus B210	uhd	✅ (with ext. filters)	✅	✅	📝

Per-device notes

RTL-SDR v4

• Most affordable entry point. Default flowgraph flowgraphs/rtl_ssb_hf.grc.
• For HF use: enable direct-sampling mode or add an upconverter (Ham It Up, SpyVerter, etc.).
• Common setup: RTL-SDR v4 + Ham It Up Plus + LNA → RFWhisper @ 14 MHz USB.

Airspy HF+ Discovery

• Better HF dynamic range than RTL-SDR; highly recommended if you work DX or contests.
• Lower native sample rate (768 ksps) means less CPU for decimation.

ADALM-Pluto

• Stock firmware tunes 325 MHz–3.8 GHz; community mods enable full HF. Follow local regulations.
• Very popular for VHF/UHF weak-signal experimentation.

SDRplay RSP series

• Use SoapySDRPlay3 (not the legacy SDRPlay module).
• Enable broadcast notches in the API preset; helps the NN focus on actual noise rather than fighting an overloaded front-end.

HackRF One

• Half-duplex. Wideband (up to 20 Msps) but 8-bit ADC — narrow applications like contest SSB work better than wideband monitoring.

Reporting a new SDR

1. Run the nearest matching flowgraph.
2. Open an Issue with the hardware-report label.
3. Include: make/model/firmware, sample rates tested, a 30 s before/after recording, and rfwhisper doctor output.

We'll update the matrix and credit you.

SDRs that almost certainly work

If it has a SoapySDR driver listed at https://github.com/pothosware/SoapySDR/wiki, RFWhisper can use it. The only real question is whether we've tuned a flowgraph for it. Community flowgraph contributions are extremely welcome — see Architecture → Flowgraphs.