Which SDR Can Transmit and Receive for a GNU Radio Project?

[Pavel]

Short answer: Choose HackRF for half-duplex TX-or-RX, Pluto for a lower-cost simultaneous TX/RX transceiver workflow in its usable range, and USRP/bladeRF/LimeSDR-class hardware when channels, bandwidth, timing or driver requirements justify them. Define duplex and RF band first.

Before you start​

• State the target signal, frequency range, computer, operating system, budget and whether transmission is required before choosing equipment.
• Check the exact product variation and package contents; model-family specifications do not guarantee that every bundle contains the same radio, antenna or accessory.

Step-by-step method​

1. Step 1: Specify whether the flowgraph alternates TX/RX or needs simultaneous full duplex, plus number of channels, center frequency and clean sample rate.
2. Step 2: Check the native GNU Radio source/sink stack: libhackrf/osmosdr, IIO for Pluto, UHD for USRP/compatible boards or the vendor/Soapy path for others.
3. Step 3: Plan the RF test path with dummy loads, fixed attenuation, filters and isolation. Transmit capability is unusable safely without these items.
4. Step 4: Prototype receive and transmit separately at low rates, then combine them while monitoring overflows, underruns and receiver compression.

Concrete example​

A GNU Radio TDD experiment that alternates direction may fit HackRF. A simultaneous loopback can fit Pluto through separate attenuated paths. A 2x2 coherent experiment may require B210, bladeRF or another documented two-channel platform.

How to judge the result​

The SDR is suitable when hardware duplex, channels, frequency and sustained host rate all meet the flowgraph and the test remains inside legal and safe RF limits.

What to record​

• Build a compatibility chain from antenna connector through adapters and feedline to the SDR input, including DC bias and frequency rating.
• Reserve budget for the antenna and RF path that determine reception rather than comparing the radio alone.
• For a recommendation, explain which requirement each item satisfies and which limitations remain.

Common mistakes​

• Comparing headline specifications or the main-device price without checking the complete working system and every mandatory requirement.
• Assuming a family name, product photo or connector appearance guarantees the exact revision, contents or compatibility.
• A product described as transceiver is not necessarily full duplex; HackRF remains half duplex.

Final check​

Before buying, reopen the exact SDRstore variation and verify package contents, connectors and compatibility against the project list. Ask privately if an order-specific detail remains unclear.