Squawk Definition, Please: Why is it Called a 4096 Transponder?
Hey Mom,
I know what a mode C transponder is. But what is a 4096 transponder?
Thanks,
Squawking VFR
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Whats up, Squawk?
Your mode C transponder is also a 4096 transponder. The transponders installed in most civil aircraft are called 4096 transponders for a very simple reason. Ready? Each squawk code (series of numbers selected on the transponder) consists of 4 digits, each of which can go from 0 up to 7, giving us 4096 possible combinations. Yup, that’s it. Sometimes the answer really is that simple!
So what about that mode C function, anyhow? Mode C refers to altitude encoding. Move the little pointer to Alt and now that sneaky little radio is telling ATC your altitude, too! Mode S is a newer version where not only does the controller automatically know how high you are, they also have information about just which aircraft you are. Yes, even before you call them and they give you a squawk code. Mode A? Just means that when interrogated, your trusty transponder replies with your squawk code, no altitude information included here, thank you very much.
Squawk altitude, and don’t forget to make sure that thing has been inspected in the last 24 months,
Mom
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