I had never looked into how IFF worked until this post left me with way more questions than answers. Like WTF is this even doing? I had very much incorrectly assumed IFF was a coded challenge-response setup, so this antenna array was confusing me. After reading the WikiP[0] article on it, it made a lot more sense about what is happening when the hand held device is used near the receiving antennas.<p>Yesterday, there was an article on signal reflections that spun me down a rabbit hole on wave reflections, 1/4 wave attenuators, dampeners, etc. Today, it's tuned antennas and playing with transceivers. Thanks to HN for helping fill my "learn 1 new thing a day"<p>[0] <a href="https://en.wikipedia.org/wiki/Identification_friend_or_foe" rel="nofollow noreferrer">https://en.wikipedia.org/wiki/Identification_friend_or_foe</a>
Is there an explaination of what's going on in the video, or is it really just a two antena array with the fields interacting with each other and the panel?