With Automatic Dependent Surveillance-Broadcast (ADS-B) equipage on the rise and a wholesale mandate for the NextGen surveillance technology less than four years away, the FAA is getting serious about how to deal with a downside of the upgrade—radio frequency interference.  The issue involves the 1090 MHz frequency and the potential ill effects of too many signals occupying too small a volume of airspace. That frequency is used not only by ADS-B transmitters but also by FAA air ...

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