"Mxsmanic" wrote in message
...
Duncan writes:

- did you see your instructor switch the transponder to standby?

Would he still be in radar contact below 100 feet AGL?

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If the transponder is on Standby, Primary return would still appear, but
information provided by the Mode C Transponder (altitude, squawk code, etc.)
would not. Primary return is just the radar signal bouncing off the
aircraft, the other information is "broadcast" by the transponder when it is
"interrogated"