Product Manual QDA4-45 RF Amp/Combiner May 1, 2014
Table of Contents Table of Contents ................................................................................................................................ 2 Overview ............................................................................................................................................. 3 Specifications ...................................................................................................................................... 4 Installation ...........................
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.
Specifications Physical Size:8.5” [216mm] wide x 1.75” [38mm] height (1RU) x 6.0” [153mm] deep Weight: 1.1 lb [500g] Enclosure: Durable metal enclosure, rack mountable Front Panel Input Selection, 1 or 4 inputs, Green LED indicators RF Gain Selection with LED display, 0-25 dB for four inputs, 0-32 dB for one Back Panel Inputs: 4 F Connectors Amp Out: 1 F connector DC Power: Power 2.1 mm coaxial jack (inside center conductor positive), 700 mA maximum, 11.5 to 12.
Installation Basic Setup The QDA-4-45 is designed for QMOD applications, but can be used with other RF channels at similar levels. Use only the included 12 VDC power supply, do not use with shared 4 or 6 amp DC power supplies. Connect one source to Input 1 Connect to the In 1 RF Input (not 2-3) Select Input 1 on the front panel Adjust Gain up and down, 0 – 32 dB, add in input level for total RF level. For example to amplify one QMOD (typical 29 db) to 45 dB, add +16 dB of gain.
Rack Mounting Three options are available for rack-mounting QCA9-33 Active Combiners and QMOD modulators. RK2 Dual Rack Kit with Tie Bar Mounting New QMOD and QCA enclosures have a slot in the bottom middle of the case. This will accept a tie bar that will lock the two enclosures together without taking the cases apart. Do not mount next to new- generation QMODs (QDA enclosure will block flow-through ventilation). 1. 2. 3. 4. Check that your enclosures have the tie bar slot.
Safety Instructions Read before operating equipment. 1. Cleaning - Unplug this product from the wall outlet before cleaning. Do not use liquid cleaners or aerosol cleaners. Use a damp cloth for cleaning. 2. Power Sources - Use supplied or equivalent UL/CSA approved low voltage DC plug-in transformer. 3.
Limited Warranty and Disclaimer Contemporary Research Corporation (CR) warrants this product to be free from defects in material and workmanship under normal use for a period of two years from the date of purchase from CR. Should such a defect occur CR will repair or replace, at their option, the defective product at no cost for parts or labor. This warranty extends to product purchased directly from CR or an Authorized CR Dealer.
