New Contemporary Research QDA4-45 RF Distribution Amplifier

Dallas, TX – Contemporary Research introduces the QDA4-45, a digital combiner/amplifier that can switch between one or four inputs, with adjustable 0-32 dBmV gain for up to 50 dBmV level output.

Designed for QMOD HDTV modulator applications, the QDA4-45 can receive an RF feed from one to four QMOD modulators or QCA9-33 Active Combiners. A first for RF amplifiers, a front-panel LED display shows the amount of RF gain selected when level is changed and when the combiner is activated. The RF noise factor will be necessarily higher than the QCA9-33 Active Combiners, but far lower than typical RF launch amplifiers. The compact amplifier can be mounted two-across in one rack space, mixed with QMOD modulators and QCA9-33 active combiners.

Tech Communication Director Doug Engstrom states, “The design goal for the QMOD system is to originate and combine at the 30 dB level, keeping RF noise to an absolute minimum. The QDA4-45 handles the final stage, boosting the total level up to 50 dBmV. This reserves added noise to the final stage, rather than adding noise during combining – and the QDA-45 adds lower noise than comparable RF amplifiers.”

About Contemporary Research
Contemporary Research designs and creates solutions for an HDTV world, offering cutting-edge, professional quality QAM modulators, HDTV display control systems, and fully controllable ATSC/NTSC/QAM tuners. For more information please go to or call 888-972-2728.

Media Contact: Nissen Davis • (310) 729-6510 • E-mail