Compact 4+1 FM Digital Exciter
The Multi LM is a compact multichannel equipment for FM Digital Signal processing and Modulation, based on the latest technologies using an FPGA ( Field Programmable Gate Array ) and Direct Digital RF Up-Conversion. The use of the most modern technologies allows to have an extremely compact and efficient equipment with reduced consumption and dimensions of 2HE 19″ Rack Standard.
– FM Modulation by digital Processing
– Direct-to-Channel RF frequency generation for superior RF and audio performance
– Up to 150W for each channel
– The full complement of audio inputs: L&R analog, MPX, Mono analog and AES-EBU
concurrently available for primary and backup source assignment
– Ethernet connectivity links for programming and data service transmission
– Universal power supply with power factor correction (PFC)
and high/low voltage detection
– Advanced Stereo generator and RDS encoder are standard,
with inputs for external SCA or RDS equipment
– Internal DVB S/2 multistream satellite receiver
– Internal pluggable GPS receiver
– RF output low-pass filter is included for use directly on air
– LCD menu system eases setup, operation, and maintenance
– 1 ASI input (PID Filtering)
– Web server, SNMP protocol
The equipment is composed of 5 Channel Plugs, indipendent transmitting units each able to control the broadcast of a single channel up to 150W. Up to 4 channels can be simultaneously on-air, while the 5th Channel Plug acts as a passive reserve automatically activated trough the internal switch-over logic when needed.
The Multi LM is equipped with multiple Audio Inputs types and with an internal GPS receiver ( 1pps and 10Mhz ) for the necessary synchronization. The integrated software, accessible both in local or remote, allows to set up and control every aspect of the equipment. An intuitive Local Interface displayed on the LCD and controlled through a rotative KNOB allows real-time monitoring and configuration of the equipment parameters.
Multicarrier FM Transmitter (87.5 – 108 Mhz)
GENERAL RF Power Output: 150W / Channel Output Impedance: 50 ohms nominal VSWR: Rated power into 1.5:1 VSWR. Open and short circuit protected at all phase angles Frequency Range: 87.5MHz to 108MHz; 100kHz increments, 50kHz-10kHz when specified Frequency Stability: Internal VCXO: +/-1Hz, -10° C to +50° C, External Output: +/- accuracy of reference source Audio Inputs: AES/EBU (wire), L&R analog, MPX, SCA/RBDS/ RDS. internal RBDS/RDS generator Internal stereo encoder generator Modulation Type: Digitally generated FM Digital direct Upconversion Modulation Capability: Up to 300kHz Asynchronous AM S/N Ratio: 80dB below rated power reference carrier with 100% AM modulation at 400Hz, 75usec. deemphasis with no FM modulation present Synchronous AM S/N Ratio: 60dB below rated power reference carrier with 100% AM modulation at 400Hz, 75usec. deemphasis with FM modulation +/- 75kHz at 400Hz Spurious and Harmonic: 85dB or better; low pass filter standard AES/EBU Operational Modes: Stereo, mono Input Level: -24- 0 dBfs for 100% modulation; typ. -6dBfs Impedance: 110 ohms Connector: BNC Amplitude Response: +/- 0.01dB, 20Hz to 15kHz THD: 0.006% or better S/N Ratio: 80dB or better below 100% modulation @ 400Hz Stereo Separation: 80dB, 20Hz to 15kHz Linear Crosstalk: 80dB below 100% modulation; 20Hz to 15kHz; main to sub and sub to main Pilot Stability: +/- 0.1Hz, 0 degrees C to +50 degrees C MECHANICAL Dimensions (WxHxD) Weight (approx.) mm 484x176x500 Kg 34 AC MAINS AC Input: 90 to 264VAC; 47-63Hz Power Consumption 4 x 228.75 VA @ max power output Power Factor: > 0.97 Surge Protection: Tested with IEEE C62.41-1991 recommended waveforms for location category B3 and IEC 801-4 standard waveforms for severity level 4 Regulatory: FCC; DOC; CE; CCIR; IEC 215 Safety ENVIRONMENTAL Temperature Range: -10° C to +50° C Altitude: 10,000 ft (3048 m) Humidity: 95% maximum, non-condensing MPX Input Level: 0-12 dBu typ. 6dBu for 100% modulation Impedance: Unbalanced: 2k ohms Connector: BNC Amplitude Response: +/- 0.02dB; 20Hz to 53kHz; 0.1dB; 53kHz to 99kHz Phase Response: +/- 0.1 degree from linear phase; 53kHz to 100kHz THD: 0.02% or less FM S/N Ratio: 80dB below 100% modulation @ 400Hz STEREO/MONO Analog Input Operational Modes: Stereo, Mono (L only) Input Level: +10dBm Impedance: 600 ohms or 10k ohms Connector: XLR Amplitude Response: +/- 0.5dB; 20Hz to 15kHz THD: 0.02% or less; 20Hz to 15kHz Linear Crosstalk: 70dB below 100% modulation; 20Hz to 15kHz; FM S/N Ratio: 85dB or better below 100% modulation @ 400Hz