- High power and high efficiency due to modern design technology
- Rugged, reliable and highly redundant design
- Final amplifiers voltage supply proportional to RF output power
- Dedicated built-in power supply for each amplifier module
- Exciter digital based FM modulator
- Fully broadband power amplifier modules 87.5 –108 MHz
- Easy replacement of RF amplifier modules during operation for simplified maintenance
- Internal GPS option for high frequency stability and synchronous FM application
- Bidirectional interactive GSM monitoring and controlling system (option)
- Built-in Radio Data System
- Built-in high quality digital stereo coder
- Modular central control system for straightforward monitoring and in-depth diagnostics
- Web, SNMP remote control, and parallel commands remote control interface
- Configurable in system N+1 controlled by Logic N+1 controller
The Siel air-cooled series offers high power and high efficiency due to design technology and power voltage regulation circuit. This regulation mechanism in amplifier modules yields a major increase in efficiency. The supply voltage for the power transistors is adjusted as a function of the output power and frequency significantly improving efficiency.
Maximized Coverage with the Exciter
Utilizing the digital exciter, the benefits that customers can realize are improved stereo signal-to-noise, AM noise null, and the ability to synchronize to an external reference for use in on-channel booster systems. The exciter provides a flawless signal with complete technical and regulatory compliance for solid-state transmitters. Both analog AF signals and digital signals in line with bit-serial AES/EBU protocol can be processed. Left/Right,MPX, RDS or SCA signals can be used as modulation signals.
Monitoring, Web interface and remote control
Each power amplifier module has dedicated control and monitoring to support on/off functionality warnings and alarms for reflected power, temperature, power overdrive and other measures. The transmitter control unit handle both internal and external communications and provides all control functions. All transmitter, cooling system, exciters and amplifiers parameters required for diagnostics can be retrieved locally as well as remotely from anywhere in the world via a standard (IP) protocol and standard software (web browser,SNMP). This allows to accurately evaluate the transmitter status of unattended stations.
Transmitters can be provided with internal GSM monitoring and controlling system as requested option. This feature allows the operator to monitor the transmitter status via GSM command receiving SMS from transmitter unit about status and eventually failure states. Using GSM system, the operator can also send remote control to the transmitter unit.
The transmitter supports a range of backup options simplifying on-air servicing and eliminating costly interruptions. In dual-drive systems, the integrated control system monitors exciters and switches control of RF feed. Conventional standby systems such as exciter standby, (N+1) standby, passive standby can be implemented. High redundant design in amplifier modules also makes the Air-Cooled series a very rugged, reliable transmitters family.
The transmitters are air-cooled. Air cooling system includes internal blowers, which pull cool air from the front through a removable filter, and exhausts in the rear. An exhaust air extractor is also present on the top of the cabinet. Various air ducting configurations or external system taking air from cleaning room is available as option.
|Primary Power||3-phase 50/60 Hz,
50/60 Hz, 240/230/208/127/115V
|AC Line Variation||± 15 %|
|Max Installation Altitude||2000 m above sea level
(>2000 m on request)
|Operating Temperature Range||-5 °C to +45 °C|
|Permissible Relative Humidity||95%, non-condensing|
|Cooling Method||Forced Air|
|FM Modulation Modes||Stereo, Mono, MPX|
|Output Frequency Range||87.5 to 108 MHz|
|Output Impedance||50 Ω, unbalanced|
|Permissible VSWR||< 1.5|
|Frequency Drift (per year)||< 1×10-6|
|Frequency Drift (per year)
(with optional GPS Board)
|Ext. Time and Ref. Frequency|
|Reference Frequency||10 MHz|
|Reference Impedance||50 Ω|
|Time Ref. Input Frequency||1 PPS|
|Analog L/R Input||XLR, 600 to 3kΩ balanced|
|AES/EBU Audio Input||BNC, 75 Ω|
|MPX Input||XLR 600 to 3kΩ
|External 10 MHz Clock Input||BNC|
|External 1 PPS Clock Input||BNC|