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Rohde & Schwarz Delivers Liquid Cooled Air Traffic Control over Greenland

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Rohde & Schwarz Press Release Header - RF Cafe


The R&S SK4105 high-power HF transmitter from Rohde & Schwarz combines high transmission power and reliability with a small footprint, making it ideal for air traffic control over large areas with harsh site conditions, such as Greenland.

Rohde & Schwarz will be delivering R&S SK4105 shortwave transmitters to Naviair - RF Cafe

In the summer of 2023, Rohde & Schwarz will be delivering R&S SK4105 shortwave transmitters to Naviair. (Photo: Rohde & Schwarz)

Nuuk/Munich, December 13, 2022 - In the summer of 2023, Rohde & Schwarz will be delivering low-maintenance and compact R&S SK4105 shortwave transmitters to Naviair, the Danish air navigation service provider that handles air traffic in the lower airspace from the Flight Information Center (FIC) in Greenland.

Greenland’s airspace is huge and transmitter stations are placed in remote locations. Naviair operates several HF and VHF radio systems at strategic points along the Greenlandic coast. The Flight Information Center (FIC) in Nuuk, Greenland, is responsible for primary communications. Its legacy HF transmitters will soon be replaced with the new, high power R&S SK4105 shortwave transmitters.

R&S SK4105 shortwave transmitters to Naviair - RF Cafe"The R&S SK4105 is ideal for the demanding Greenland environment with a compact footprint, reduced maintenance, low power consumption and high reliability" Henrik Tvilling Jensen, Project Manager, Naviair. "The new transmitter meets our environmental and performance requirements."

The R&S SK4105 transmits in the frequency range from 1.5 MHz to 30 MHz with up to 5 kW transmission power. The high transmission power enables clear, long-range radio links between ground stations and aircraft. The transmitter has a liquid cooling pump unit and fits into a 19-inch rack. Other transmitters require up to four times as much space and more frequent maintenance because of mechanical wear.

"Liquid cooling relieves thermal stress on all components in the housing and increases overall system reliability," explains Marius Münstermann, Vice President Air Traffic Control, Rohde & Schwarz. "This is very important for transmitters with safety-critical tasks, especially those in remote, snow-bound locations that are very difficult to access. Under such operating conditions, waste heat from the transmitter housing can be used to warm the transmitter shelter."

Compared to air-cooled RF transmitters, overall power requirements are lower. This reduces operating costs and helps air navigation service providers shrink their carbon footprint. In regions outside Greenland's permafrost climate, liquid cooling has another benefit: since the cooling system is independent of ambient air, the transmitter can also be operated in locations with little air conditioning.

"The R&S SK4105 control transmitter is based on R&S Series 4100 radio devices, whose 1 kW version has been successfully used in several Greenland coastal radio stations for vessel traffic," Mr. Münstermann says. "The exciter is in line with EUROCAE ED-137C criteria and is software defined, making it easier to integrate new transmitter functions and adapt to future radio standards. As part of the Rohde & Schwarz CERTIUM portfolio, the HF high-power transmitter is compatible with other CERTIUM hardware and software and can be expanded to suit specific applications."



About Rohde & Schwarz

The Rohde & Schwarz technology group is among the trailblazers when it comes to paving the way for a safer and connected world with its leading solutions in test & measurement, technology systems, and networks & cybersecurity. Founded nearly 90 years ago, the group is a reliable partner for industry and government customers around the globe. On June 30, 2022, Rohde & Schwarz had around 13,000 employees worldwide. The independent group achieved a net revenue of EUR 2.53 billion in the 2021/2022 fiscal year (July to June). The company is headquartered in Munich, Germany.

R&S® and CERTIUM® are registered trademarks of Rohde & Schwarz GmbH & Co. KG. All press releases, including photos for downloading, are available on the internet at www.press.rohde-schwarz.com.



Rohde & Schwarz USA, Inc.
6821 Benjamin Franklin Dr.
Columbia, MD 21046
Web: https://www.rohde-schwarz.com
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+1 888 837 8772

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Posted December 13, 2022

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About RF Cafe

Kirt Blattenberger - RF Cafe Webmaster

1996 - 2024


Kirt Blattenberger,


RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The World Wide Web (Internet) was largely an unknown entity at the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps while tying up your telephone line, and a nice lady's voice announced "You've Got Mail" when a new message arrived...

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