Rev E TR-220 90 008 088-1
1-7
1.6 Abbreviations, Acronyms and Glossary of Term
1
A/A Air to Air
A/A B Air to Air Beacon
ac or AC Alternating Current
A/D Analog to Digital
ADS-B Automatic Dependent Surveillance - Broadcast
Address The unique code to which a MODE S transponder replies. This is not to
be confused with the 4096 code used for identifying ATCRBS
transponders. The address of a MODE S transponder is not alterable by
the pilot or crew.
Altitude The pressure altitude of the aircraft as transmitted by an ATCRBS or
MODE S transponder. This information is obtained from an external
sensor and transmitted to the transponder.
AM Amplitude Modulation
ATCRBS Air Traffic Control Radar Beacon System
ATCRBS/MODE S All Call Interrogation that causes all ATCRBS/MODE S transponders to reply.
ATC Air Traffic Control
AUT Aircraft Under Test
BIT Built in Test
Comm Refers to the communications and data-link capability of a MODE S
transponder. There are four (4) capabilities: No Comm, Comm A/B,
Comm A/B/C and Comm A/B/C/D. The Comm. capability is displayed
when the transponder is determined to be a MODE S.
CW Continuous Wave
D/A Digital to Analog
DAP Downlinked Aircraft Parameter
dB Decibel
dBm Decibels above 1 milliwatt
dc or DC Direct Current
DME Distance Measuring Equipment
DPSK Differential Phase Shift Keying. The method of modulation used for the
selective MODE S uplink interrogations.
DF Downlink Format. The format included in a MODE S transponder reply to
an interrogation or squitter message that indicates the type of message.
ELM Extended Length Messages
FAA Federal Aviation Administration
FAR Federal Aviation Regulation
FIFO First In First Out
FREQ Frequency
ft. Feet
G/A Ground to Air
Hz Hertz
IF Intermediate Frequency
IFF Identify Friend or Foe
KHz Kilohertz
kts. Knots
LCD Liquid Crystal Display
LED Light Emitting Diode
1
Further definitions may be found in the following reference books and documents: Helfrick, A.D. Principles of Avionics.
Leesburg: Quality Books, 2000. RTCA/DO-181B. Minimum Operational Performance Standards for Air Traffic Control
RADAR Beacon System/Mode Select (ATCRBS/Mode S) Airborne Equipment. Washington D.C.: 1999. United States.
Federal Aviation Administration. Federal Register Fed 3
, 1987 FAA rules Part 91.
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