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JOELLE TESSLER, AP technology writer Joelle Tessler, Ap technology writer ¨C June 30, 07:01 pm ET qui WASHINGTON-new test results show that a proposed national network of broadband wireless would produce a significant interference with GPS systems used for everything from aviationdre headphones to networks of high precision timing for consumer navigation devices. Amendments to the proposal could reduce the interference, but wouldn't rule it out. The findings, based on extensive testing equipment in Las Vegas, increase the pressure on the Federal Communications Commission to block a Virginia company called LightSquared launch of the network, which is designed to compete with super-fast systems being implemented by the AT&T and Verizon Wireless. Although the FCC in January gave LightSquared approval to build the system, the Agency said that the company would not enable the network until they are resolved GPS interference problems. The Agency needed LightSquared, manufacturers of GPS and GPS users to establish a working group to study the subject. This group Filed its report with the Commissionbeats by dre diddy on Thursday, with both sides offer different interpretations of test results. LightSquared insisted that the interference problems are correctable. But the GPS equipment manufacturers and companies and Government agencies that rely on GPS technology, warn that the planned network would jam their systems because LightSquared would use airwaves near for those already set aside for GPS. They say that sensitive satellite receivers ?? designed to pick up relatively weak signals from space ?? could be overwhelmed when LightSquared starts sending signals of up to 40,000 high power transmitters on the ground. GPS signals, they say, will suffer the way a radio station can get drowned out by a stronger broadcast in a nearby canal. "FCC must consider other options for signs of LightSquared where they do not run against the laws of physics," said Charles Trimble, cofounder of Trimble Navigation Ltd., which causes the GPS systems. With the report of the Working Group, the cheap monster beats butterflyFCC now will seek public comments. The FCC said it will review the report, adding that he has "an old registry dispute resolution of interference". Report of the working group follows the release of federal test results that also found a significant interference with GPS systems used by a wide range of government agencies, including the coast guard, the Federal Aviation Administration and NASA. Faced with growing GPS industry resistance, LightSquared last week proposed to launch its network using a different slice of airwaves located farther away from GPS frequencies. It is also proposed to transmit signals at lower levels of energy to ensure that your network would not interfere with most GPS systems nearby. Most of the tests carried out by the Working Group was based on the original plan of the company use waves of advancing to the band GPS. The Working Group, said that the plan wouldbeats by dre pro produce significant interference, linear. Among the findings: ? GPS systems used for aviation would be available on entire regions of the country at altitudes of normal aircraft. GPS receivers ? built in cell phone handsets could experience significant distances interference of base stations of LightSquared ?? resulting in readings of delayed or inaccurate location. Space ? GPS receivers used in NASA science missions could be stopped. Although the working group only performed limited testing on the basis of a proposal from the LightSquared to use different radio waves, said the change could reduce problems for some GPS receivers, including those used in cellular phones and navigation of aircraft. LightSquared, however, recognizes that other beats by dre lady gagaGPS devices, particularly high precision receivers used in construction and agriculture, would still have significant disruption. LightSquared States that the interference is largely a problem of own make GPS industry. This is because GPS receivers are picking up signs outside their own bands ?? on licensed frequencies to LightSquared. That had never submitted a conflict until the FCC provisionally approved wireless broadband network of LightSquared. Until now, this spectrum was mainly used for satellite communications, with only limited wireless service on Earth to fill gaps in coverage. GPS receivers can screen easily. LightSquared, which is based in Reston, Virginia, also insists that the problem can be fixed by installing better filters in GPS devices to filter your signals. These filters, LightSquared says, cost as little as 5 cents. GPS manufacturers say that the solution is speculative because these filters do not yet exist and were not available for testing. They add that although filters can work with some GPS receivers, such as those embedded in cell phones, they would not work in all GPS equipment and can significantly impair performance and battery life. Bronson Hokuf, an engineer with GPS manufacturer Garmin Ltd., also said it would be almost impossible to improve hundreds of millions of existing GPS devices already in use. The working group said install new filters in the GPS equipment used for aviation, for example, it would be too expensive and could take at least 10 years. Although the FCC has promised that he will not leave the network LightSquared harm GPS systems, is eager to see the company succeed. The FCC sees the network as part of a broader government effort to make more radio waves for mobile broadband services to keep up with the explosive growth of online applications, video and other bandwidth need wireless mobile applications. The Agency also hopes that lightsquared will help you promote your goal to bring Internet connections to high speed all Americans. The company, which plans the wholesale network access to other companies that will rebrand the service under your own name, undertook to reach 260 million Americans with its coverage until 2015.