Aqua Broadcast Cobalt C‑2500 2.5kW Digital FM Transmitter

Aqua Broadcast Cobalt C‑2500 Product Overview

The Aqua Cobalt C-2500 is a fully featured 2.5kW FM broadcast transmitter for medium power main stations, translators and LPFM sites that need excellent audio quality and high resilience. Its direct-to-channel DDS modulator, running on a customised Linux OS, ensures very low distortion and clean spectra, while the integrated 4‑band audio processor with ITU‑R BS412 limiting keeps program audio loud, controlled and consistent. A dynamic RDS/RBDS encoder, digital MPX (AES192) and comprehensive IP/SNMP control make the Aqua Cobalt C-2500 a complete “all‑in‑one” medium power FM platform.

Key Features

• 2500W solid-state FM stereo transmitter with DDS modulation, high AC efficiency and dual temperature-controlled fans.
• Three hot‑swappable power supplies with integrated backup PSU, three‑phase 208–400Vac input and 7/8″ EIA 50Ω RF output.
• VHF Band II 87–108MHz operation in 100kHz steps with ±1ppm frequency stability from the internal 10MHz reference.
• Integrated stereo encoder, selectable 0/50/75µs pre‑emphasis, 20Hz–15kHz ±0.02dB response and up to 75dB stereo separation.
• Onboard 4‑band processor with AGC, multiband compression, bass enhancement and BS412 compliant limiting.
• Dynamic RDS/RDS2/RBDS generator plus analogue and digital MPX I/O with MPX power limiting and confidence monitoring.
• Analogue stereo, AES/EBU, digital MPX and Ethernet audio options with GPS 10MHz and 1PPS inputs for SFN timing.
• HTTPS web interface, SNMP v3, email alerts and extensive GPIO for alarms, interlocks and remote automation.

Applications

Combine the Aqua Cobalt C-2500 with an Antenna Package to maximize signal coverage or meet licensing requirements, and add an FM Cavity Filter to pass only the desired FM broadcast frequency while rejecting unwanted signals. For more Aqua Broadcast equipment, visit the Aqua Broadcast product page.