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To: DMaA who wrote (473948)	2/25/2012 6:30:15 PM
From: Maurice Winn	1 Recommendation Respond to of 793925

Yes. < Question is can anyone use this spectrum without interfering with GPS? > The spectrum is quite distinct from GPS. Some badly designed GPS devices pick up transmissions outside the GPS limits and those faulty devices then do not work properly. People should not make or buy badly designed devices such as GPS units which suffer interference from nearby frequencies. Mqurice

To: DMaA who wrote (473948)	2/26/2012 2:56:17 AM
From: pheilman_	3 Recommendations Respond to of 793925

Question is can anyone use this spectrum without interfering with GPS? Yes and No. GPS signals are very, very weak and no terrestrial transmitter can be allowed in adjacent spectrum. That is why the spectrum in question was allocated for satellite transmitter. It was all a scam to reassign the spectrum for terrestrial use and make it many multilples more valuable. You know, make a donation to Obama, gain a benefit? I have seen that there is a 24,000x payoff for these donations. Were the GPS manufacturers designs sloppy? No, it is simply not possible to make perfect* RF filters. There will always be some leakage of signals from adjacent channels. If they were also from satellites the power would be the same, no harm, no foul. If it is a terrestrial transmitter it might be 1000x closer than the GPS satellite making the signal 1,000,000 times stronger, and the filter cannot exclude it. Did I mention scam? Could there be a larger indictment of the FCC? It could never, never work, any RF engineer knew this from the moment they saw it. Did they assume no one would ever use the adjacent spectrum? There is a reasonable assumption that new spectrum users will not step on existing usage. The RF filters are selected based on the assumption that the FCC will do their damn job. Perfect RF filters are also known as Brick Wall filters and are physically impossible to construct. "Real-time filters can only approximate this ideal, since an ideal sinc filter (aka rectangular filter*) is acausal (means future predicting) and has an infinite delay," And the better the filter in frequency the more it affects delay, not a problem for video or audio but a devastating problem for GPS which is completely based on measuring delay.