Aero-Terms are designed to be a daily reminder of the terms,
names, acronyms and explanations of the unique language that
populates the aviation world. Aerospace, sport aviation, fixed
wing, helo, you name it... it's all fair game.
Aero-Terms should serve as a quick but intriguing reminder of
the terms you may use every day, or an introduction to an aspects
of the Aero-World you may not yet be familiar with. ANN also
encourages readers to go beyond the FMI link, and further research
any intriguing terms.
The ground-based surveillance radar beacon transmitter-receiver,
which normally scans in synchronism with a primary radar,
transmitting discrete radio signals which repetitiously request all
transponders on the mode being used to reply. The replies received
are mixed with the primary radar returns and displayed on the same
plan position indicator (radar scope). Also, applied to the
airborne element of the TACAN/DME system.