FM Retransmission Unit for Highway Tunnels
Project Overview:
I worked as an Embedded Systems Engineer at ABE Teknoloji in Istanbul for nearly 18 months.
At the time, the company had an FM Radio Retransmission System already deployed in 5 highway tunnels. Together with the team, we redesigned and upgraded the system into a more compact, industrial-grade form factor. Our work spanned software, hardware, industrial design, and GUI development.
The device receives on-air FM signals and retransmits them into tunnels using leaky feeder coaxial antennas (already installed for communication coverage). It also allows live or recorded voice announcements to override the signal when needed. Thanks to its modular architecture, the system can operate across up to 64 channels and be configured as a transmitter, receiver, or full transceiver.
✅ Key Outcomes
- Designed a compact, visually refined 3U rack-mountable device that meets industrial standards
- Migrated the backend from a stationary PC to an embedded industrial SBC inside the device
- Restructured the circuit and system architecture to enable full modularity
🛠️ Technology Stack
- Chipsets: MSP430, SiTime SI4721, Odroid SBC
- Industrial GUI: Python, Flask, Bootstrap 4, Embedded Linux
- Hardware Design: Circuit Studio