On Thu, 23 Jul 2020 at 16:35, Matthew Woehlke <mwoehlke.fl...@gmail.com> wrote:
Well off-topic now. (OT: Airline transponders may be IFF — note the capitalization — > although I wonder about that because I always think of IFF as more a > military thing. I'm not sure if civilian transponders are really meant > to *identify friend or foe*, or if they're more just "transponders".) > Transponders on civil aircraft implement a subset of the military Mark XII IFF system. This is no coincidence: military aircraft should treat civilian aircraft as friendly... Mode S (civilian) and mode 5 (encrypted version of mode S for the military) are used by TCAS to avoid collisions. So civilian transponders are IFF systems with restricted capabilities. This is probably not a suitable place to discuss this further. -- Paul
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