DAB COFDM Modulator 3000

Features

• ETS 300 401, 300 799 and EU147 compliant
• Supports T1 and E1 input rates
• Digital IQ (ETS 300 798), IF and RF outputs
• Transmission Modes: I, II, III, IV
• Programmable static delay up to 1.6 seconds
• Linear and Non-Linear Digital Precorrection
• Web and SNMP(optional) Remote Control
• Downloadable software upgrades
• Dynamic Reconfiguration
• Auto Single Frequency Network setup

Overview

UBS’s sleek and slender state-of-the-art DAB Modulator is setting new standards for DAB equipment. No longer does the broadcaster have to waste large areas of rack space deploying new solutions. The UBS solution occupies a mere 1U of rack space making it truly unique. This innovative product is the result of extensive consultation with many of the world’s premier DAB broadcasters. It has been designed exclusively to satisfy the needs of the professional broadcaster, addressing the revolution now taking place in Radio throughout the world. The robust and efficient COFDM RF modulation technology provides superior coverage in non-line of sight situations. It is resistant to multi-path interference even in a mobile environment.

Inputs

Dual NA inputs which can automatically and seamlessly switch between the two network feeds, having corrected for any differential network delay of up to 1 Second. Dual NI Inputs with Auto Switching between inputs.

IF Output

The DAB Modulator uses all-digital synthesis and quadrature modulation. A digital IF Section converts the complex I/Q signal to an IF signal, using direct modulation. The output is an IF frequency of 44 MHz (or 36 MHz, optional).

Digital Precorrection

The DAB modulator features both digital Linear and digital Non Linear precorrection. The Non Linear precorrector is able to reduce, in both phase and amplitude, the intermodulation products resulting from the nonlinear characteristics of the high power amplifier. The value of third and fifth order products are adjustable, thereby reducing both in-band and out-of-band intermodulation products. The Linear precorrection compensates for the frequency and group delay response of the RF path in the system prior to transmission. This distortion is mainly caused in the combiner and mask filter sections of the overall transmission system. Adjustments can be made to the Band Tilt, Band Sag, S Curve and overall group delay. The above advanced features allow power amplifiers to be operated at higher output levels while maintaining very low out-of-band emissions.

Control

Local modulator control is performed via an easy to use front panel, by means of navigation keys and an illuminated LCD display, allowing the intuitive menu structure to be accessed. Local control is also available through the RS232 serial port, using a CLI (command line interface) protocol.

Optional Features

RF Output - Band III or L-band

The DAB Modulator includes a high quality programmable up-converter, specifically developed for COFDM applications, which performs the frequency conversion The output frequency is flexible and can be set anywhere in Band III or L Band, using a channelized raster, while displaying the appropriate frequency. (Other frequency bands are available on request).

Dual Band (Band III and L band)

Dual Band output option is also available for this product.

Direct Frequency Select option

Allows setting the RF output frequency to any value in Band III or L-band.

Internal GPS option

This version of DAB Modulator includes an internal GPS unit, used for synchronizing the output signal and setting the delays, when operating in SFN Mode. The GPS output signals are also available on the rear panel, for connection to other equipment.

WEB Interface Remote Control option

Remote control is offered via the remote Ethernet Interface using the optional Web server solution. The WEB pages are designed as a complete Graphical User Interface (GUI), for monitoring the status and setting the parameters of the DAB Modulator.

SNMP Remote Control Option

Simple Network Management Protocol (SNMP) is supported via the Ethernet interface. The MIBs are available from UBS for customers wishing the flexibility of integrating this product into their existing control solution.

RS485/RS232 machine-machine option

The command protocols are available from UBS, for customers interested in controlling the RF Transmitter from the DAB Modulator unit.