Rhizomatica develops HERMES digital shortwave radio for remote data transmission

HERMES System Overview

Rhizomatica, a Philadelphia-based nonprofit, has developed and open-sourced the High-frequency Emergency and Rural Multimedia Exchange System (HERMES). This digital shortwave radio set operates in the high-frequency (HF) band from 3 to 30 megahertz, utilizing its Mercury digital modem.

HERMES is a software stack that allows for the transmission of various file types, including photos, emails, and voice memos, over HF radio. This capability extends beyond basic voice communication, providing a data pipeline for remote areas.

Connecting Remote Locations

HERMES is designed to connect remote, indigenous, and off-grid communities globally, with Rhizomatica staff deploying the system in countries such as Bangladesh, Brazil, and Ecuador. The system uses the ionosphere to facilitate long-distance communication, reliably achieving 400- to 600-kilometer links between two radios with approximately 20 watts of power.

This technology is particularly useful in locations where establishing terrestrial communication infrastructure is challenging or impractical.

Importance of Data Transmission

The ability to send digital files and data over HF radio is significant for emergency situations and operational needs. Instead of verbally relaying information, users can transmit precise data such as latitude and longitude, manifests, parts lists, or telemedicine information.

Sending files like photos provides evidence for situations such as illegal logging, offering a more efficient and accurate method of communication compared to voice-only transmissions.