UBpup™ Digital Mobile Broadcast Terrestrial Repeater

Description

UBS Terrestrial Repeater system is a fusion of proven principles and solutions, combined with recent advancements in technology relating to thermal management and digital signal processing. The implementation of innovative concepts, in conjunction with our extensive knowledge and experience in the design and development of repeater equipment allowed us to develop a new generation of Terrestrial Repeaters, which are more efficient and reliable, while supporting all the features required in functionality and serviceability.

Frequency bands available:

• UHF Band
• L-Band (L1 - L3 and 1.67 GHz)
• S-Band (2.2 GHz and 2.33 GHz)
• MMDS-Band (2.5 - 2.7 GHz)
• Available in DAB, DMB, DVB-T, DVB-H and CMMB standards
• Proprietary waveforms (XM radio, Sirius radio)

Repeater Features

• Compact outdoor self-contained 200W Terrestrial Repeater platform.
• Environmentally protected light-weight cabinet
• Forced air cooling system with easily replaceable air filter
• Front and rear hinged doors for service access to various test ports.
• Modular construction for easy maintenance
• Protected AC outlet for connecting external test equipment
• DVB-S2 satellite receiver for backbone signal reception, IP backbone interface
• Built-in GPS synchronization
• High Performance LDMOS Power Amplifier
• Digital Linear and Non-linear Predistorter and Null Elimination technology
• WEB GUI for element management and SNMP Agent for network management
• RF overdrive, high VSWR and over-temperature protection

Repeater System Components

Exciter

The Exciter receives the input signal from the satellite and performs digital, analog and RF signal processing, to generate the output COFDM waveform to the required RF frequency, at the appropriate amplitude level, necessary to drive High Power Amplifier. The Exciter includes the following sub-modules:

• DVB-S/S2 satellite receiver (or other signal format receiver, as required). The Receiver processes the RF signal from the satellite antenna LNB and outputs ASI stream.
• COFDM Modulator accepts data stream from ASI interfaces, extracts useful data payload, demodulates it and re-modulates the signal, performs stream synchronization and generates analogue I&Q signals. The modulator is built on Virtex IV with Power PC platform and TigerSharc DSP.
• The Up Converter performs quadrature modulation of IQ signals and converts them to the required RF frequency. The variable gain amplifier inside the Up Converter is used for the automatic level control of the RF output.
• The Main System Controller monitors and controls the entire repeater system, as well as provides the interface to Network Management System. The Controller is built on MCP860 microprocessor, which realizes all functionality related to the site management, including controlling the GPS Receiver, modem and input interface cards. The Controller also employs a supervisor microprocessor ATMega2560 which communicates with Power Amplifier and RF Detectors and maintains output power level.
• The Internal UPS provides uninterruptible power source to the Main Controller for about 5 minutes. During this time the Main Controller will be able to send alarm notification and store the system log file in EEPROM.

Power Amplifier

The Power Amplifier represents the final amplification stage for terrestrial output signal. The amplifier receives the RF signal from Up Converter and amplifies it up to the level of 200 Watts at the Repeater output (50 Watts, 100 Watts and 400 watts options are available). The Power Amplifier is powered from integrated highly efficient switching power supply. The amplifier functionality is controlled by embedded microcontroller, which maintains amplifier gain control, provides monitoring of operational parameters and protection from abnormal conditions. The Power Amplifier utilizes advanced heat sink design, based on material with enhanced thermal conductivity.

Bandpass Filter

The output bandpass filter is built using high performance dielectric resonator (DR) coupled cavities. The DR design allows to minimize the weight and size of the filter, while maintaining low insertion loss and high rejection of out-of-band spectrum components.

Output Coupler

Provides sample ports for the output signal level control and monitoring. It employs coaxial air line design for low losses and high directivity.

RF Detectors

Provide accurate measurements of the forward and reverse RMS power levels from the Output Coupler. The power level measurement is waveform and temperature independent.

Technical Specifications