in ATCRBS, Mode C is altitude only, there is no Mode 3/A interrogation included. That is why the modes are interlaced, usually 3/A, 3/A, C , then repeats for civilian ATC.

Am I correct in saying that most of the ADS-B IN units one can purchase to connect to your IPad using Garmin Pilot or Foreflight APPS will be able to directly pickup the Reg, Height and display the Position of any aircraft using a Mode-S ES transponder? Provided the ADS-B IN unit can accept 1090ES transmissions of course. In other words, if you already have a Mode-S ES transponder in your aircraft you don't need to purchase a separate ADS-B Out unit to be seen by pilots only using ADS-B IN (1090ES Capable) units??

On the Mode C response slide, the bullet point for C1-C4 seems over simplified, the coding given seem to hold only for altitudes of 0, 1000, 2000... and not for 500, 1500, 2500 where the coding seems to be reversed?

In my humble opinion, in the page where we have A/C (meaning Aircraft) and also MODE A/C, it would be better to write "Aircraft" in lieu of A/C. Thank you.

Your Mode S All Call slide is completely wrong. You show a SSR with a P4 . This is used a SSR interrogation (intermode) not Mode S All call. P4 is added to stop Mode S transponders (located on aircraft) responding, well a short P4 is and a long P4 is the opposite. Short P4 is recommended and Stops RF pollution when using Mode S and SSR interrogations at same time Apart from that you it’s good 👍

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Sir, please upload more videos on latest developments in aviation (ATSEP)