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www.southgatearc.org
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Ofcom admit Out of Band Emissions increaseIn a statement released on Monday the UK regulator Ofcom has admitted that they will be allowing an increase in out of band emissions from users in the auctioned section of 10 GHz. Back in June 2006 Ofcom announced its intention to sell off the top half of the internationally agreed Amateur Radio Satellite Service 10.450-10.500 GHz allocation. The joint response from the Radio Society of Great Britain, UK Microwave Group, AMSAT-UK and BATC to the consultation raised concerns about the apparent increase in out of band emissions that would be permitted by users of the auctioned bands. In their statement released 3rd December 2007 Ofcom now say: Out of band emissions 3.32 The Radio Society of Great Britain (‘RSGB’) requested that Ofcom confirm that modifications to masks or out of band emissions only apply to merging lots within auction segments and do not permit an increase in out of band emissions outside of the auction bands. 3.33 Ofcom considers it reasonable to relax the out of block limits where narrow beam antennas are used. On balance Ofcom does not consider that this change disproportionately alters the potential for interference for users adjacent to the blocks under the award. This is the upper limit for the out of block limits and is unlikely to be reached in all deployments, and this in conjunction with the use of narrow beam antennas further limits the potential for interference. This means the remaining section of the Amateur Satellite allocation could be subject to far higher levels of interference from the winners of the Ofcom auction. The 10 GHz Amateur Satellite Service allocation is used by Amateur Satellites with highly elliptical orbits such as AO-40. During its orbit this satellite can be over 60,000 km from earth. Signals from this distance are extremely weak and Radio Amateurs typically operate with receivers as good as -130dBm in order to receive such signals. Radio Amateurs are currently building the first Private Venture spacecraft to Mars, P5-A. This spacecraft will orbit the Red planet and deliver a payload to the Martian surface. During its mission P5-A will be sending back data in the Amateur Satellite Service 10 GHz band. Any interference will jeopardise the reception of this vital scientific data. In order to carry out such valuable pioneering experimental work it is imperative that the Amateur Satellite Service has access to low noise floor Microwave spectrum.
Ofcom launch consultation on plan to sell-off Amateur Satellite 10 GHz allocation http://www.southgatearc.org/news/june2006/ofcom_10ghz_allocation.htm Ofcom publishes 10 GHz spectrum sell-off slides http://www.southgatearc.org/news/august2006/sell_off_slides.htm AO-40 IARU Amateur Satellite Frequency Coordination Ofcom 10 GHz Consultation Responses Joint response from the Radio Society of Great Britain,
UK Microwave Group, AMSAT-UK and BATC Ofcom – 10 GHz, 28 GHz, 32 GHz and 40 GHz Ofcom - Statement on the making of regulations in connection
with the award of 10 GHz, 28 GHz, 32 GHz and 40 GHz PDF of Ofcom 10 GHz Statement
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