The OPTIMOD 5518 - Superb stand-alone stereo encoder with NO overshoots and RDS

OPTIMOD 5518 is a superb stand-alone stereo encoder combining look-ahead and band-limited clipping techniques with latency as low as 2 ms and full overshoot limiting and extremely tight peak control in both the left/right and composite baseband domains, to control STL-induced overshoots while minimizing artifacts. The 5518 is the ideal choice for network broadcasters who process with an FM audio processor (Like Orban Optimod FM 8600) at the network origination point and who need a processor at every transmitter to eliminate network STL overshoots.


The 5518 includes a full-featured RBS/RBDS generator at no additional charge. The generator supports dynamic PS. It can be controlled via the 5518 presets and an ASCII terminal server that can be connected to automation to support, for example, displaying title and artist.

ITU BS 412 multiplex power limiter

The built-in, defeatable ITU BS412 multiplex power controller acts on all outputs to meet even the most stringent European government regulations include a full spectral protection of subcarriers and RDS/RBDS regardless of the amount of composite limiting.

10 Mhz Reference input

A 10 MHz frequency reference input allows the stereo pilot tone frequency to be locked to GPS or another high-accuracy frequency standard. This improves the performance of single-frequency networks in areas where coverage of the transmitters overlaps.


The stereo encoder’s stereo sub-channel modulator can operate in normal double sideband mode and in an experimental compatible single sideband mode (SSB/VSB) that is offered to enable users to compare and assess the two modes.

Silence Sense

Analog Fallback to Digital control that allows Silence Sense to switch the active input from Analog to Digital if silence is detected in the analog input signal but not on the digital input signal. This function works vice versa as well on both analog and digital AES input.

Diversity Delay

The 5518 can delay its output by as much as 16 seconds. This delay can be used as the diversity delay in Digital Radio installations.

Remote Control

At the transmitter side you'll be pleased by its three separate remote control ports - GPI contact closures, RS232 serial and built-in Ethernet for TCP/IP networks. The serial and Ethernet ports are supported by the supplied 5518 PC Remote Control application. This Windows® 2000/XP/Vista/7/8/10 allows you to access all 5518 features and allows you to archive and restore presets, automation lists, and system setups (containing I/O levels, digital word lengths, GPI functional assignments, etc.)

Administrating and Monitoring

The SNMP (Simple Network Management Protocol) features allow you to monitor your Optimod’s status and to send Alarm notifications via your Optimod’s Ethernet connection to your network. API features allow custom third-party applications (including automation systems) to recall presets, view status and set the controls.

The 5518's feature set fully exploits the processor's DSP and computer-based control architecture. To ensure absolute accuracy, you can automatically synchronize the clock to an Internet timeserver. It has a cool-running, energy-efficient switching power supply and uses the latest dual-core DSP chip technology from Freescale Semiconductor.