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-   -   FBI/DHS overflights in the US (https://www.pprune.org/north-america/577263-fbi-dhs-overflights-us.html)

Mascot PPL 9th Apr 2016 17:29

Basil, I've never been in the military or sigint, just read a few popular WWII books/watched documentaries. IMHO I wouldn't base any security models around hoping that the bad guys haven't read the same books/watched the same programs on youtube.

Niner Lima Charlie 9th Apr 2016 19:46


Originally Posted by MarcK (Post 9336699)
I don't think turning off transponders in a crowded airspace would be feasible.

Every year at the Oshkosh AirVenture fly-in the NOTAM requires all transponders be off or standby within 30 miles due to over saturation of the system.

MarcK 9th Apr 2016 21:14


Every year at the Oshkosh AirVenture fly-in the NOTAM requires all transponders be off or standby within 30 miles due to over saturation of the system.
That wouldn't turn off ADS-B, though, would it? It might, since ADS-B is supposed to repeat the squawk (I really don't know)

Lucky8888 10th Apr 2016 02:08


Originally Posted by peekay4 (Post 9338231)
With 1090 MHz ADS-B you cannot block your tail number. So in practice any blocking would be done voluntarily by sites like FR24 if requested by the aircraft owner.

However, anyone with a $30 ADS-B receiver can always decode the raw ADS-B stream, get the ICAO addresses, then perform tail number mapping.

With 978 MHz ADS-B (UAT) there is an anonymity function for VFR aircraft but that won't prevent enthusiasts / journalists / bad guys from noticing flight patterns such as the ones described here.

We use rotating call signs in our transponders. Problem solved (for now).


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