GPS Systems Threatened by Wireless Data Proposal
This is one of those odd stories that illustrate the way business and government sometimes work together to build new and powerful communications systems. The outcome could affect many consumers who own and use GPS guidance systems in their cars or for outdoor recreation. To a certain degree, it could affect radio engineers.
The story began with an FCC allocation for a satellite communication system in the spectrum 1525 to 1559 MHz — an allocation that until now has had limited commercial appeal and is not heavily used.
Along came a company with a vision to help supply wireless data services, what we used to know as the cell phone industry. Wireless data is in short supply and high demand.
The company, LightSquared, came up with an idea to make this L Band spectrum useful for terrestrial data: Use the spectrum to build a terrestrial network and connect it up with satellites. The plan had a lot to like. An underutilized segment of spectrum would be converted into a highly profitable and useful segment of the wireless data industry.
This is where the government help comes in. When this spectrum was allocated, it was for satellite communications; it was not a license to build a terrestrial network. So a petition for an exemption was filed, quietly and just before the Thanksgiving holiday, on Nov. 19, 2010. Instead of the normal 30-day comment period, the petition was “fast-tracked,” which allowed only a few days for comment.
The FCC then ruled in favor of LightSquared and gave it the permit to build a new terrestrial network of high-power transmitters for high-speed data. The permit allows up to 40,000
THERE’S JUST ONE PROBLEM …
Although the proposal was fast-tracked at the commission, there were technical concerns. Specifically, LightSquared spectrum was perilously close to a satellite system that has been in place for many years: the network of GPS satellites used for civilian and military purposes.
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That requires a receiver that has exceptional sensitivity. Terrestrial services, on the other hand, use relatively high-power signals to convey large amounts of data over a wide geographical distance. In this case, the GPS system requires receivers to
His statement was broadcasted on Tunisian radio. Earlier on Friday, Tunisian Radio Mosaique FM quoted a Libyan rebel source as saying that members of Al Qathafi's family fled to Tunisia to board a Venezuelan plane bound for Caracas.
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May be a little unusual. It consists of an oscillator (T2 and T3), which synchronizes with the received frequency of T1. This transistor operates as a preamplifier broadband VHF range.
The oscillator is set between 87 … 108 MHz with C5.
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