Aqua Broadcast Cobalt C‑700 700W Digital FM Transmitter

Product Overview

The Aqua Cobalt C-700 is a robust 700W FM broadcast transmitter aimed at FM and LPFM stations needing high power, premium audio quality and strong redundancy in a compact 2U package. Its direct-to-channel DDS modulator, running on a customised Linux OS, delivers exceptionally clean modulation with minimal processing artefacts, while an integrated 4‑band audio processor and ITU‑R BS412 limiter provide on-air loudness and protection. A dynamic UECP-compliant RDS/RBDS encoder, digital MPX (AES192) support and multiple audio input paths make the Aqua Cobalt C-700 a complete “all-in-one box” transmitter for modern analogue or AoIP-based plants.

Key Features

• • 700W solid-state FM stereo transmitter using direct-to-channel DDS modulation for low distortion and excellent spectral performance.

• • Adjustable RF output typically from 200–700W with 7/16″ DIN RF connector, high AC efficiency and temperature-controlled fan cooling.

• • VHF Band II operation from 87–108MHz with 100kHz steps and ±1ppm frequency stability from an internal 10MHz reference.

• • Integrated stereo encoder supporting stereo, mono L+R, mono L and mono R modes with 20Hz–15kHz ±0.02dB response and stereo separation up to 75dB.

• • 4‑band audio processor with ITU‑R BS412.9 limiting, bass enhancement, AGC and preset loudness curves for fast on-air deployment.

• • Dynamic, UECP-compliant RDS/RDS2 encoder plus digital MPX (AES192) input for composite-over-AES workflows.

• • Analogue stereo, AES/EBU digital audio and analogue/digital MPX inputs, plus wideband MPX I/O and headphone monitoring.

• • Dual redundant hot‑swappable PSUs, each with its own AC input, plus 48V DC input for exciter backup power.

• • Advanced automation with scheduler, audio failover, silence detection, email alerts and SNMP v1/v2c/v3 support.

• • Remote management via secure HTTPS web interface, Ethernet control and GPIO so engineers can monitor and configure the Aqua Cobalt C-700 from any location.

• • Mono SNR ≥75dB (AES/EBU), mono THD+N ≤0.002% analogue and ≤0.001% AES, with composite and digital MPX paths specified down to 0.001% THD+N.

Applications

Use the Aqua Cobalt C-700 as the main transmitter for LPFM and full‑power FM services, as a high‑power node in SFN or translator networks or as a feature‑rich driver for larger RF systems. Thanks to its DDS exciter, integrated processing, dynamic RDS and dual redundant power supplies, the Aqua Cobalt C-700 delivers reliable 700W operation, premium sound and low total cost of ownership for demanding broadcast installations.

Pair the Aqua Cobalt C-700 with appropriate antennas in our FM Antennas or FM Antenna Packages categories to build scalable systems around 700W. To explore more Aqua Broadcast products related to the Aqua Cobalt C-700, visit our Aqua Broadcast brand page and the main FM Audio Processors section for compatible processors.