Contemporary Research QDA4-45 RF User Manual

Product Manual

QDA4-45 RF Amp/Combiner

May 1, 2014

Table of Contents

Table of Contents ................................................................................................................................ 2

Overview ............................................................................................................................................. 3

Specifications ...................................................................................................................................... 4

Installation ......................................................................................................................................... 5

Basic Setup .............................................................................................................................................. 5

Rack Mounting .................................................................................................................................... 6

RK2 Dual Rack Kit with Tie Bar Mounting ................................................................................................... 6

RK1 Single Unit Rack Mount ...................................................................................................................... 6

RK2 – Locking Cases together .................................................................................................................... 6

Safety Instructions ............................................................................................................................. 7

Limited Warranty and Disclaimer ....................................................................................................... 8

Contemporary Research 2 QDA4-45

Overview

The Contemporary Research QDA4-45 is an amplified RF combiner that can switch between one or four inputs, with
adjustable amplification up to 50 dBmV.

Designed for QMOD HDTV applications, the QDA4-45 can receive an RF feed from QMOD modulators or QCA9-33 Active
Combiners. Inputs can be switched between one or four inputs, with selectable gain.

The compact QDA4-45 mounts two across in a single rack space using CR RK1 and RK2 rack kits, and can be mixed with
QMOD HDTV modulators using the same rack kits. The units are wholly designed and manufactured in the USA.

Features

 Switches between one input or four input combiner
 Adds up to 32 dBmV gain for one input, 25 dB for 4 inputs
 Provides a maximum output level of up to 50 dBmV
 Wideband, low noise amplifier
 Low power, draws less than 8.5 watts
 Compact metal enclosure, mounts 2 across in 1 RU using RK1 and RK2 rack kits

Applications

 Combine up to 4 QMOD Modulators
 Combine 4 QCA9-33 Active Combiners for 36 channels
 Use as launch amp for RF system
 Use as booster amp to merge QMOD channels with existing 50 dB analog modulator systems

Contemporary Research 3 QDA4-45