An open-source 240-antenna array to bounce signals off the Moon

QuadRF is a versatile software-defined radio tile designed for building massive phased arrays, capable of high-end applications like 5G base stations and lunar signal bouncing.

QuadRF: A Software-Defined Radio Tile

Price: $49 - 99 (TBD)

Overview

A 4-antenna SDR tile designed for arraying. Useful as a standalone SDR or as a building block for larger phased arrays.

Key features

Frequency: 4.9–6.0 GHz (C-band), full duplex
Per-antenna bandwidth: 40 MHz; 8+8-bit I/Q
Tx power: 1 W per antenna
Rx NF: ~1.2 dB
Polarization: RHCP (Tx), LHCP (Rx)
Clocking: MEMS TCXO, Jitter ~1.4 ps
FPGA: Lattice ECP5, Latency < 1 ms
Power: 12 V DC (~25 W peak)

Standalone applications

General-purpose 4x4 MIMO Software-defined Radio
Fox-hunting, direction of arrival (DOA), RF exploration
Open Wi-Fi router, Open 4G/5G base station
Drone HD links, robotics communications

Source: Hacker News

More in this category

dev-tools

Leaving Mozilla

A poignant and candid reflection from a 15-year Mozilla veteran upon their departure. The author highlights the leadership's missteps in trying to emulate tech giants and urges Mozilla to return to its core values: community and uniqueness.

dev-tools

Shepherd's Dog: A Game by the Most Dangerous AI Model

A developer tested Anthropic's latest, supposedly 'too dangerous' AI model by asking it to build a long-held game idea in a single shot. The model succeeded, generating a complete 2,319-line game after a 45-minute reasoning session.

dev-tools

Open source AI must win

If artificial intelligence becomes a utility rented only from a few closed institutions, humanity loses its operational freedom. Open-source AI is a vital infrastructure for the future of our digital society.

dev-tools

Statement on US government directive to suspend access to Fable 5 and Mythos 5

The US government has issued an export control directive forcing Anthropic to suspend all access to its Fable 5 and Mythos 5 models due to national security concerns, a move the AI safety startup strongly disputes.

dev-tools

Electric motors with no rare earths

Renault Group is pioneering the development of electrically excited synchronous motors (EESM) that eliminate the need for rare earth magnets, reducing dependency on global monopolies while driving efficiency and sustainability.

dev-tools

Swift at Apple: Migrating the TrueType hinting interpreter

Apple has rewritten its TrueType hinting interpreter from C to memory-safe Swift for its Fall 2025 OS releases, improving security and boosting performance by an average of 13%.

EXPLORE TOPICS