DAB COFDM Modulator 2000 OEM Board

Model: DAB2000

Features

· ETS 300 401, 300 799 and EU147 compliant
· IF and Digital IQ (ETS 300 798) Outputs
· Transmission Modes: I, II, III, IV
· Programmable static delay up to 1.6 seconds
· Linear and Non-Linear Digital Precorrection
· Web Browser Control
· Downloadable software upgrades
· Dynamic Reconfiguration
· Auto Single Frequency Network setup

Overview

The DAB Modulator OEM card offers the advantage of generating a complete DAB COFDM signal on just one board, which can be conveniently installed inside a DAB Transmitter. This innovative product is the result of extensive consultations with many of the world’s premier DAB broadcasters and meets all the requirements of the ETSI and Eureka DAB Standards.

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.

Processing

Acting on the ETI header inserted by the ensemble multiplexer, the DAB-Modulator can perform dynamic multiplex management, allowing all modes of operation (Mode l, ll, lll and lV). Static delay can be incrementally adjusted in service, up to 1.6 seconds, offering the flexibility required when implementing a single frequency network architecture. Under the control of either NA or LI timestamps inserted in the ETI by the ensemble Multiplexer, the modulator can automatically manage network delays up to 1.6 seconds.

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. 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.

Control

Local control and machine-machine control (optional) supported on two serial ports: RS232 and RS485.

Optional Features

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.

DAB Modulator Specification Sheet