The Federal Communications Commission (FCC) has issued an order to prevent software-defined radios (SDRs) from being modified to the detriment of other users who share the available spectrum.

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The order will prevent SDRs from being modified by users to alter the RF operating program and will thereby ensure that the technology remains in compliance with FCC rules--specifically the frequency, power and mode restrictions sanctioned within the United States. Though not immediately available, the order was passed unanimously by all five FCC commissioners.

The FCC acted to avert possible software modifications to a programmable radio by savvy users that would violate the spectrum restrictions, causing interference. Software programmability is already built into some components, such as the hand-off recognition used in cellular phones, as well as the channel-management schemes and dynamic frequency selection used in wireless LANs. The order also addresses the technical aspects related to interruptible spectrum leases.

"I think these issues are far more important than is generally recognized," said the soon-to-depart FCC chairman, Michael Powell. "SDRs are entering the market in increasing numbers. When they begin arriving in full force, you are talking about a massive revolution in radio technology that will enable fascinating new opportunities for a dynamic utilization of spectrum," he added.