Broadcaster Magazine


Comark Launches PARALLAX Wideband Doherty UHF Transmitter

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  • Hitachi Kokusai Electric Comark LLC, a manufacturer and supplier of DTV transmitters, encoding systems, and associated field services for over 40 years, has announced the release of PARALLAX  the industry’s next generation medium and high power, liquid cooled, solid state transmitter.  At NAB 2024, Comark displayed the prototype final RF power amplifier and power supply modules.  For NAB 2024, the full transmitter design will be on display at the company’s booth (C4309).  PARALLAX is ready for the upcoming broadcast spectrum repack and ATSC 3.0.

    For large or small stations, PARALLAX has the unique flexibility to ensure top-notch performance for specific needs. With up to 16 Power Amplifiers (PA’s) stacked in a single rack cabinet, it delivers an industry best of up to 27.5kW. Power levels can be scaled higher with multiple cabinets (up to 100kW TPO) or scaled back to as few as 3 x 2kW amplifiers for 5.4kW output power.  The PA’s utilize the latest Asymmetric broadband Doherty LDMOS FET devices.  These devices not only provide broadband high efficient operation, but also have the benefit of providing the equivalent output power in ATSC 1.0 (8VSB) and ATSC 3.0 (OFDM).

    According to Richard E. Fiore, Jr., Hitachi Kokusai Electric Comark LLC President and CEO, “Solid state amplifier technology continues to leap forward with higher power capability and efficiency never imagined years ago.  We have embedded the latest technology and features into the PARALLAX to meet market demands.  The vertical PA configuration in PARALLAX is easier to handle and the transmitter delivers the highest RF output power capability and power density of any transmitter on the market.”

    Hitachi Kokusai Electric Group has delivered many transmitters over the past 60 years. By taking the advantage of Hitachi Kokusai Electric Group’s vast experience in designing and manufacturing transmitter equipment, the new PA is the state-of-the-art; designed by experience engineers and manufactured to perform with the highest quality standards.

    PARALLAX features liquid cooling, an optimized RF design, and can be controlled and monitored via an optional Wi-Fi connection using a smart phone or digital tablet. PARALLAX also features a built-in control soft-fail in case of emergency operation, keeping the unit on air at all times. The control system also enables Comark’s customer service group to remotely diagnose during transmitter operation and perform remote software updates.

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