File talk:Mode S interrogation.jpg
Beware, this image is wrong and lead to misinformation!
From P1 to P2 there are 2.0µs. From P2 to P5 (inside P6) are 2.75µs. P5 is at 1.25µs from P6, so:
(P1 to P2) + (P2 to P5) - (P6 to P5) = 3.5µs
Preamble isn't 30.5µs long! It is 3.5µs!!!
See http://www.radartutorial.eu/13.ssr/pic/mode_s2.print.png as a clarification. P1 to P6 its clearly impossible to be 30.5µs!
Please, see page 3-82 from ICAO, Annex 10, Volume IV, Surveillance and Collision Avoidance Systems. I don't know if images from that document could be reproduced here without permission.
