Cobalt C-5000 / 5000W FM Transmitter

The COBALT C-5000 is a fully featured 5000W / 5kW FM Transmitter that has superior audio quality and sound clarity thanks to it‘s Direct to Channel Digital technology (DDS). Running on a Ifully customized LINUX OS system, this low distortion modulator is available on all models within the COBALT family of FM Transmitters. Inputs and outputs include Analog, AES/EBU, Digital MPX (AES192), Ethernet, USB, GPIO, GPS Sync with built in SFN capabilities.  

Ideal for many Medium power Broadcast applications where High quality audio is needed.

COBALT Medium Power Transmitters have an industry standard 7/8” EIA output, ready to connect to your Transmission line.

Powered by single phase or 3 phase power, and protected by a breaker at the rear, its quick and easy to connect to a new or existing system. COBALT Medium Power Transmitters are designed for durability and reliability with features such as redundant fans and hot-swap power supplies. The compact design also includes easily accessible, washable air filters on the front panels of the power supplies.

An optional DC Input lets you run the COBALT C5000 on a 48V DC power system and allows the telemetry and alarms functions to still be accessible in the event of a mains power failure that opens further possibilities for off-grid power options..

Radio market beating sound will let you stand out to your listeners, with its built-in 4 band Audio Processor with Bass enhancement, Pilot protection, Wide AGC and a whole bunch of expertly designed modern presets, so you sound great right from the start.

The modern design lets you easily read the Ultra-clear RGB display, and the intuitive Joystick controls with Haptic feedback and additional silicon buttons allows fast setup, getting you on the air even faster.

The advanced communication package with Intuitive web interface and remote control via Ethernet (https) lets you make changes or monitor the COBALT Transmitter. Full SNMP Version 3 management and the ability to send emails, alerts and monitor audio remotely gives you added confidence knowing you have full control from anywhere in the world on any device with a Web browser.

Easy access to all components and software controlled variable fan speed, will guarantee you low cost of maintenance. The highest AC efficiency, a compact design and reduced weight mean low cost of transportation and far the lowest total cost of ownership in its class.  



  • RF Output power5000 watts / 5kW
  • Direct to Digital Exciter
  • 4U Compact Design

$ 24390 / € 22490 / £ 19190


    • Direct to Digital Synthesized modulation
    • Linux OS
    • RGB Screen
    • 4 Band Audio Processor
    • Dynamic, UECP Compliant RDS Encoder
    • ITU-R BS412.9 Limiter
    • Digital MPX (AES192)
    • Ethernet Control with HTTPS
    • SNMP v1, v2c, v3
    • Advanced Automations and configurations
    • Scheduler
    • Audio Failover and Silence Detection
    • GPS Sync for SFN
    • Hot-Swap PSU


    • Dante / AES67 audio
    • µMPX
    • 5 Band Audio Processor


Output Power (W)  5000W / 5kW
Range (W) 5000W adjustable
RF Output connector 7/8” EIA, 50 ohm
Input ACV  208/400Vac Three phases 47÷63 Hz
Temperature controlled fan 2
Power supplies 3
Dimensions WxDxH (inch) 19 x 24 x 4RU (7”)
Dimensions WxDxH (cm) 48.3 x 60.0 x 17.8
Weight 38kg / 84lb


Transmitter type Solid-state FM Stereo transmitter
Modulator Direct-to-channel (DDS)
RF Output Frequency Range VHF Band II, 87-108MHz
RF Frequency Steps 100kHz
Frequency Stability ±1 ppm or ±150Hz in 0-50⁰C range with internal 10MHz clock  reference
FM Modulation Range Capability 75kHz default, 100% modulation user adjustable up to 105kHz  140%), maximum 300kHz


Power Stability ≤ ± 0.25dB
Asynchronous/AM noise ≤ -60dB
Synchronous AM s/n ratio ≤ -60dB
RF Harmonic and Spurious Suppression Meets ETSI requirements
VSWR operation Fully protected against gradual or sudden VSWR conditions. Proportional power reduction from VSWR 1.5:1


Performance 400Hz/1kHz test tones at modulation level ≤75kHz 
Modes Stereo, Mono L+R, Mono L, Mono R
Frequency response 20Hz-15kHz ±0.02dB
Pre-emphasis 0, 50 or 75μs
Pilot tone 19kHz, adjustable level 0-12%
Subcarriers suppression ≤ -70dB
Stereo separation ≥75dB AES/EBU input, ≥70dB Analogue input
Stereo SNR ≥80dB with 75us de-emphasis, ≥75dB without de-emphasis, both inputs
Stereo THD+N <0.03%
Crosstalk ≥70dB, between L+R and L-R due to channel matching, both inputs


Frequency response   20Hz - 15kHz  ±0.02dB 
Pre-emphasis  0, 50 or 75 µs
Mono SNR ≥75dB AES/EBU input, ≥70dB Analogue input
Mono THD+N ≤0.002% analogue input, ≤0.001% AES input, with 75us  de-emphasis


Frequency response  10Hz-53kHz ±0.03dB, 53kHz-70kHz ±0.3dB
FM SNR 10Hz-53kHz ±0.03dB, 53kHz-70kHz ±0.3dB
THD+N ≤0.003% with 75us de-emphasis


Frequency response  -90kHz ±0.005dB
FM SNR ≥100dB, with 75us de-emphasis
THD+N ≤0.001% with 75us de-emphasis


Analogue 2 x XLR female, 10kΩ impedance, level adjustable 0-24dBu
Digital 24dBu AES/EBU via RJ45 per StudioHUB+, level adjustable  -20-0dBFS, sampling rates 32-192 kHz


Headphones Out 1/4" (6.3mm) female stereo socket, software adjustable volume, minimum load impedance 16Ω


Analogue MPX BNC,  10kΩ impedance, level adjustable 0-12dBu 
Digital MPX AES/EBU via RJ45 per StudioHUB+, level -20-0dBFS, sampling rate 192kHz left channel
Analogue  RDS BNC,  10kΩ impedance, level adjustable from 0.1-10Vpp


Analogue MPX BNC,  10kΩ impedance, level adjustable 0-12dBu 
Digital MPX BNC,  10kΩ impedance, level adjustable 0-12dBu 


Type Fully Dynamic RDS/RDS2/RBDS Generator
Protocols ASCII commands, UECP protocol and X-Command Multi-port architecture

UART over USB-B & Ethernet


10MHz input BNC, 50Ω terminated
1PPS input BNC, 50Ω terminated
RF sample output SMA, 50Ω, -30dBc
UART over USB USB-B, system control
USB 2 x USB-A, storage & FW upgrade
Ethernet 1 x RJ45
RS232 DB25 shared connector, system control
GPIO DB25 shared connector, 8 x output & 8 x input, all optically isolated.
Interlock/RF Mute DB25 shared connector, programmable logic/polarity
Analogue voltage output DB25 shared connector, 4-channel 0-5V range


Altitude 15,000 ft / 4,420m AMSL
Temperature range 0 to +45ºC working. -10 to +50ºC storage
Humidity 95% @ 35ºC, non-condensing