Koppar LTE Modem is an open-hardware USB-C board designed to give a computer cellular data, texting, and voice-call capability through one cable and a nano-SIM. An onboard USB hub presents the Quectel EC25-EUX LTE module as a network adapter and AT-command serial ports, while an RP2040 converts the modem’s PCM call audio into a USB microphone and speaker. This lets a computer handle calls through a headset or software, including scripts and AI agents. The 85-by-65-mm, four-layer board has indicator LEDs but no battery, screen, or speaker; it draws power from USB-C and needs a 5 V source capable of 3 A to support modem transmission bursts.
The repository includes KiCad design files, fabrication outputs, assembly lists, a design review, and instructions for building the board. It specifies the European EC25-EUX variant, two LTE antennas, a voice-enabled SIM plan, and some components that must be sourced or installed separately. Rev B has zero design-rule errors and no unconnected nets, and corrects earlier problems with antenna impedance, power layout, and SIM-socket orientation. However, the board is still being ordered: firmware bring-up, modem commands, and the first call or text remain future work. Voice service also depends on carrier support and, where older networks are unavailable, compatible VoLTE firmware. The hardware is released under a permissive CERN open-hardware license.
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