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A comment on FCC Temporary Waiver Permits Higher Symbol Rate Data for Hurricane Ida Traffic. Parent comment

Re:FCC Temporary Waiver Permits Higher Symbol Rate Data for ... by madengr on Monday August 30, 2021 @12:10PM (#28357154)
GPS uses PN codes for the timing difference measurement, as well as allowing multiple satellites on a single channel. I believe the dithering (selective availability) was turned off years ago, thus the L2 channel ads only ionospheric correction (which can also be accomplished with local sources).

The FCC symbol rate limitation needs to go. It’s a hindrance on HAM radio. Just regulate it by bandwidth, or better yet EIRP PSD, but that would be tough to control.

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Re:FCC Temporary Waiver Permits Higher Symbol Rate Data for ... by jaywalk on Monday August 30, 2021 @12:34PM (#28357488)
Yes, Selective Availability was turned off in 2000 and will never be re-enabled. In fact, the latest generation of GPS satellites do not even support Selective Availability: https://www.gps.gov/systems/gps/modernization/sa/
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