Contemporary Research Introduces QDA4-45 RF Distribution Amplifier

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

Dallas, TX - May 2, 2012 - Contemporary Research introduces the QDA4-45, a digital combiner/amplifier that can switch between one or four inputs, with adjustable 0-30 dBmV gain for up to 45 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 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 to 45 dBmV. This reserves added noise to the final stage, rather than adding noise during combining."

For InfoComm 2012 visitors, Contemporary Research is at booth C6810.

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 www.crwww.com or call 888-972-2728.

Featured Product

PureLink - HCE III TX/RX: 4K HDR over HDBaseT Extension System w/ Control and Bi-Directional PoE

PureLink - HCE III TX/RX: 4K HDR over HDBaseT Extension System w/ Control and Bi-Directional PoE

The HCE III Tx/Rx HDBaseT™ extension system offers full HDMI 2.0 compliance supporting HDR (High Dynamic Range) and 4K@60Hz with 4:4:4 chroma sampling. Featuring PureLink's proprietary Pr©cis codec, a light compression technology, the HCE III can transport Ultra HD/4K, multi-channel audio, and High Dynamic Range (10 bits support) content over a single CATx cable. The HCE III provides HDMI extension up to 130 feet (40 meters) at Ultra HD/4K and up to 230 ft. (70 meters) at 1080p over category cable with embedded multi-channel audio, CEC pass-through, bi-directional RS-232 and IR control, and PoE - all with zero loss and zero noise. The HCE III Tx/Rx also supports Dolby TrueHD, Dolby Digital Plus and DTS-HD Master Audio plus LCPM (up to 192 kHz). Additionally, the low profile "slim box" enclosure design make the HCE III ideal for limited space installation environments, such as behind flat panel displays and video walls.