Cobalt C100-I / 100W FM Transmitter

Housed in a rugged, Industrial chassis, the Cobalt C100-I is designed for demanding environments, in an ultra -compact form that is designed to be mounted in various ways. 

With its maximum output power of 100W, Cobalt C100-I Transmitter has the same, superior audio quality and sound clarity of all other COBALT Transmitters clarity thanks to it‘s Direct to Channel Digital technology (DDS). Running on a fully 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), ITU-R BS412.9 Limiter, Ethernet, USB, GPIO, GPS Sync with built in SFN capabilities.

The Cobalt C100-I does away with the Screen and front panel controls and is setup and controlled via its web-remote, on either Wi-Fi or LAN.

A standard DC Input lets you run the COBALT C100-I on a 48V DC power system and 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 advanced communication package with Intuitive web interface and remote control via Ethernet (https) lets you make changes or monitor the COBALT C10-I Transmitter.

Full SNMP 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.         



  • Industrial chassis
  • AC and 24-48V DC compatible
  • DDS Exciter

$ 4990 / € 4590 / £ 3890

  • 4 Band Audio Processing
  • Dynamic, UECP Compliant RDS Encoder
  • Direct to Digital Synthesized modulation
  • Digital MPX Encoder
  • MPX Power Limiter
  • Linux OS
  • Ethernet Control and SNMP
  • GPS Sync
  • Standard Auxiliary DC power input


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


Output Power (W)  100W
Range (W) 5-100W
RF Output connector N-Type (Female)
Input ACV @ 50/60Hz 100-240 
Power Connector IEC 13A filtered
Power consumption ~50W @ max power
AC-RF efficiency typ ~30%
Temperature controlled fan 1
Power supplies 1
Dimensions WxDxH (inch) 6.5 x 12 x 5.1
Dimensions WxDxH (cm) 16.6 x 31.2 x 13.2
Weight 3.7kg / 8.14lb


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
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