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Munich 09-Mar-2020

Rohde & Schwarz enhances and extends world’s first completely liquid-cooled transmitter for FM and HD Radio(TM) applications

Rohde & Schwarz’s fully liquid-cooled radio transmitter – R&S THR9 – calls out competitor solutions which are, at best, a hybrid liquid/air-cooled solution.

Rohde & Schwarz’s fully liquid-cooled radio transmitter calls out competitor solutions which are, at best, a hybrid liquid/air-cooled solution.
Rohde & Schwarz’s fully liquid-cooled radio transmitter calls out competitor solutions which are, at best, a hybrid liquid/air-cooled solution.

On its NAB 2020 booth (SL5016), Rohde & Schwarz will showcase a number of strategic enhancements to the R&S THR9 - the world’s first totally liquid-cooled transmitter for FM and HD Radio applications. With the latest version of the R&S THR9 transmitter not only are the transistors liquid-cooled but also the entire power amplifier stage, including power supplies, coupling units and absorbers. Consequently, the power amplifier stage of the R&S THR9 has no moving parts which may break, nor can it introduce humidity and dust to the amplifier units.

Rohde & Schwarz’s fully redundant liquid-cooling technology generates lower electrical costs for cooling and ventilation, features a smaller footprint and offers increased reliability. The R&S THR9 transmitter is designed for permanent reliable operation at 45°C/113°F at full output power. At 40kW output power only 1kW of heat is dissipated into the environment, so air conditioning requirements are minimal. The unit’s footprint is comparable with competitive systems that offer 20 kW less output.

Importantly, the R&S THR9 runs on architecture that is independent of Microsoft Windows for all HD Radio entities including its Importer, Exporter and Exgine. As a consequence, users of this fully professional solution are not dependent on the availability of security patches for MS Windows for reliable efficient operation.

Compared with competitive manufacturers, Rohde & Schwarz’s HD Radio transmitter is significantly more robust and provides a richer feature set. For HD Radio applications, the R&S THR9 features a new HD Sync functionality, which provides automatic alignment of the HD Radio Diversity Delay between the analog and digital signals of a radio station. Developed by Rohde & Schwarz, HD Sync eliminates unwanted blending artifacts that can degrade the listening experience and prevent recurring and extensive time alignment procedures for station engineers.

HD Sync for Exporter ensures full compliance to the HD Radio time alignment specifications, which means the analog and digital signal time alignment is always in the permitted range of -3 to +3 samples and is fully automatic. This minimizes stress for engineers, reduces costs for station owners and enhances listener experience, especially when receiving radio in an area of weak digital but still strong analog coverage.

For optimum operation, the R&S THR9 works in unison with the R&S RelayCaster solution, which enables the use of public internet connections for the STL (Studio Transmitter Link) of HD Radio transmitters. As a result, dedicated and expensive IP links for the feeding I2E or E2X streams are not necessary, helping radio stations to reduce infrastructure costs while not compromising reliability nor transmission quality.

“The R&S THR9 is an awesome piece of technology and is uniquely positioned in the global radio transmitter market,“ commented Manfred Reitmeier, Vice President Transmitter and Amplifier Systems at Rohde & Schwarz. “The pure liquid-cooled design liberates radio broadcasters: by transporting 90% of the generated heat out of the building through the cooling liquid, the complexity of a reliable station cooling system is massively reduced. Now for the first time, the air time of the radio transmitters does not depend on the efficiency and reliability of the station’s HEVC system.”

Press & media contact

Patrizia Muehlbauer
PR Manager Products & Standard Systems
(+49 89) 4129-13 818
press@rohde-schwarz.com

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Rohde & Schwarz

Rohde & Schwarz is a leading supplier of solutions in the fields of test and measurement, broadcast and media, aerospace | defense | security and networks and cybersecurity. The technology group's innovative communications, information and security products help industry and government customers ensure a safer and connected world. On June 30, 2020, Rohde & Schwarz had about 12,300 employees worldwide. The independent group achieved a net revenue of EUR 2.58 billion in the 2019/2020 fiscal year (July to June). The company is headquartered in Munich, Germany, and has subsidiaries in more than 70 countries, with regional hubs in Asia and America.


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Rohde & Schwarz has been an innovator in broadcast and media for over 70 years. The Rohde & Schwarz product portfolio covers the entire signal processing chain for digital video and audio content – from ingest and playout to encoding and multiplexing, from contribution to satellite and IP networks to terrestrial transmission. It includes solutions for monitoring in the studio, as well as for monitoring streaming and broadcast services and entire broadcast networks. The T&M expert also offers a diverse range of instruments for testing end user equipment and infrastructure components in development, production and quality assurance. Rohde & Schwarz invests in an IP and software based future built with the blend of innovation, experience and stability that the company can offer.

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