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GAO-06-172R 1 (2005-12-01)

handle is hein.gao/gaocrptasfv0001 and id is 1 raw text is: A ountability * Integrity RelEabilty Washington, DC 20548 December 1, 2005 The Honorable Todd R. Platts Chairman Subcommittee on Government Management, Finance, and Accountability Committee on Government Reform House of Representatives Subject: Potential Spectrum Interference Associated with Military Land Mobile Radios Dear Mr. Chairman: To address homeland defense needs and comply with government direction that agencies use the electromagnetic spectrum more efficiently, the Department of Defense (DOD) is deploying new Land Mobile Radios to military installations across the country. The new Land Mobile Radios operate in the same frequency range--380 Megahertz (MHz) to 399.9 MHz-- as many unlicensed low-powered garage door openers, which have operated in this range for years. While DOD has been the authorized user of this spectrum range for several decades, their use of Land Mobile Radios between 380 MHz and 399.9 MHz is relatively new. With DOD's deployment of the new radios and increased use of the 380 MHz-399.9 MHz range of spectrum, some users of garage door openers have experienced varying levels of inoperability that has been attributed to interference caused by the new radios.' Nevertheless, because garage door openers operate as unlicensed devices, they must accept any interference from authorized spectrum users. This requirement stems from Part 15 of the Federal Communications Commission (FCC) regulations.2 Garage door 1 The garage door openers in question are programmed to operate at 390 MHz. However, because the technology employs a wide receiver bandwidth, the openers are also susceptible to interference from signals in other parts of the 380 MHz-399.9 MHz range, with a maximum interference potential from 387 MHz to 393 MHz. '47 CFR §15 (2004). GAO-06-172R Potential Spectrum Interference Page 1

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