RF Shorts for June 12, 2014

Eutelsat blames Ethiopia for Satellite Interference

Peter B. de Selding reports Eutelsat Blames Ethiopia as Jamming Incidents Triple in his article on SpaceNews.com. "Satellite fleet operator Eutelsat said intentional interference, which accounted for just five percent of the disruptions to its fleet in 2010, was responsible for 15 percent of the signal disruptions in 2013."

Eutelsat reported that it geo-located the uplinks jamming the satellites to northeast Ethiopia.

Saudi Arabia-based Arabsat's satellites have also been jammed.

Jamming satellites isn't difficult if you have an uplink with enough power to drop the signal-to-noise ratio of the desired signal on the targeted transponder below the level at which a receiver can decode. The higher-order modulation used to increase data rates is more susceptible to interference.

Peter B. de Selding describes how protest over the jamming will end up at the ITU, but says that "industry officials admit the United Nations affiliate has no real power to impose penalties on governments, even those that are identified as conducting or sanctioning the interruption of satellite signals."

Eutelsat is pushing an ITU proposal to use a global network of antennas to speed up geo-locating of jamming sources.

The targeted Eutelsat satellites carry a program from Oromia Media Network of Minneapolis. Arabsat doesn't carry Oromia Media Network now, but de Selding says one industry official "speculated that the jammers may soon sign a contract that would put Oromia on an Arabsat satellite at 26 degrees east.

See de Selding's article for the steps satellite operators are taking together to track down jammers.

African TV White Space Put Under Microscope

I've previously reported on TV band white space initiatives in Africa. Russell Southwood describes the state of the initiative and future efforts in his article TV white spaces no Holy Grail for Africa: critics. There are trials going on in Africa, with Nigeria planning to issue several licenses to trial TVWS participants. Southwood observed that at a session on TV White Space at the African Telecommunications Union Digital Migration Summit last week in Nairobi, the issue was quite polarized with one faction stating that it was a good way to extend the reach of high-speed Internet connectivity and the other side stating that it was not a good technology for the nation and didn’t live up to promises. Southwood writes: "In a session in which the 'antis' seemed to throw every argument but 'the kitchen sink' at the idea of TVWS, it is perhaps fairest to summarize some of the main ones." See his article for the complete list of arguments against the technology.

Comments and RF related news items are welcome. Email me at dlung@transmitter.com.

Doug Lung

Doug Lung is one of America's foremost authorities on broadcast RF technology. As vice president of Broadcast Technology for NBCUniversal Local, H. Douglas Lung leads NBC and Telemundo-owned stations’ RF and transmission affairs, including microwave, radars, satellite uplinks, and FCC technical filings. Beginning his career in 1976 at KSCI in Los Angeles, Lung has nearly 50 years of experience in broadcast television engineering. Beginning in 1985, he led the engineering department for what was to become the Telemundo network and station group, assisting in the design, construction and installation of the company’s broadcast and cable facilities. Other projects include work on the launch of Hawaii’s first UHF TV station, the rollout and testing of the ATSC mobile-handheld standard, and software development related to the incentive auction TV spectrum repack. A longtime columnist for TV Technology, Doug is also a regular contributor to IEEE Broadcast Technology. He is the recipient of the 2023 NAB Television Engineering Award. He also received a Tech Leadership Award from TV Tech publisher Future plc in 2021 and is a member of the IEEE Broadcast Technology Society and the Society of Broadcast Engineers.