T-45C TS, ADV & IUT ENG-21
CNI System
2.
IFF transponder
a.
Receives series of multiple-pulse interrogation
signals from ground-based, shipboard, or
airborne interrogator (encoded radar signal)
b.
Decodes interrogation signals
c.
Checks validity of signals
d.
Transmits reply to provide
(1) Aircraft identification
(2) Altitude from barometric altimeter (Mode C)
e.
Both antennas receive transmissions, but only
antenna receiving the strongest signal transmits
reply
3.
IFF control panel functionality
Sg 2, fr 13
IFF Control Panel
a.
Master control selector (MASTER)
Fig 4: IFF System--
Major Components
(1) OFF: disconnects power to system
(2) STBY: places receiver-transmitter in warm-
up (standby condition)
NOTE: Allow a minimum of 2 minutes for
warm-up when system is first turned on.
(3) NORM: applies power to receiver-
transmitter at normal receiver sensitivity for
full range operation
(4) EMER: transmits emergency reply signals
to Modes 1, 2, or 3/A interrogations
regardless of Mode control settings. In
addition, 7700 Mode 3/A is transmitted
automatically
b.
STATUS lights
(1) ALT: not functional
Page 21-23
(9-98) Original
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