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NOTE
Emergency reply provisions. This mode of operation is possible when the MASTER switch on the IFF control panel is placed in the EMER position and the system is interrogated. Emergency operation results in four short dashes on the interrogating radar indicator, which indicates an aircraft in distress, and singles out the aircraft in emergency condition within the group of aircraft. (The MASTER switch must be in NORM, then lifted and turned to EMER, therefore preventing the switch from accidentally being in EMER.) The emergency reply consists of a code 7700 in mode 3/A.
The four, three position switches on the IFF control panel will enable or disable the system for modes 1, 2, 3/A, or C operation. Mode 1, mode 2, mode 3/A, or mode C replies are possible only when their respective switches are placed in the ON positions. Mode C is available only if both mode 3/A and mode C are placed in the ON position. Mode 1 switches permit selection of a desired code from 00 through 73. Mode 2 and mode 3/A switches permit selection of a desired code from 0000 through 7777. The OUT position if each switch prevents a reply to the respective mode interrogations. The TEST position of each switch tests the respective mode operation.
The RAD switch is used to allow the RT to reply to external test interrogation when held in the RAD position.
Allows receiver transmitter to reply to external test interrogations.
Disables the RAD TEST features of the transponder.

CONTROL/ INDICATOR STATUS ALT STATUS KIT STATUS ANT MODE 4 CODE
selector
ZERO A
B

HOLD
MODE 4 TEST/ ON/OUT
ON
OUT
TEST MODE 4 AUDIO/LIGHT/ OUT
FUNCTION
Indicates that BIT or MON failure is due to altitude digitizer.
Indicates that BIT or MON failure is due to external computer.
Indicates that BIT or MON failure is due to cables or antenna.
When the IFF mode 4 computer is installed, mode 4 interrogations bypass the decoder in the RT and go directly to the crypto computer. In the crypto computer the mode 4 interrogation signal is decoded and applied to the mode 4 recognition circuit. When a mode 4 complete concurrence exists, the mode 4 recognition circuit generates a signal to the mode 4 computer which in turn generates a mode 4 reply. The REPLY light on the IFF control unit comes on to indicate a mode 4 reply is being transmitted.
Zeroize code setting in computer.
Selects mode 4 code setting for previous, present, or next period, depending on which crypto period applies.
Selects mode 4 code setting for previous, present, or next period, depending on which crypto period applies.
Retains mode 4 code setting when power is removed from transponder.
Allows system to reply to mode 4 interrogations.
Prevents reply to mode 4 interrogations.
Provides self test for mode 4.

CONTROL/ INDICATOR  FUNCTION 
AUDIO  Enables aural and REPLY light monitoring of valid mode 4 interrogations and replies. (Preferred position) 
LIGHT  Enables only REPLY light monitoring of valid mode 4 interrogations and replies. 

 

Placing the switch in the OUT 
position will disable mode 4 
REPLY monitoring and IFF 
caution light. 
OUT  Disables aural, REPLY light, and 
caution light monitoring of valid 
mode 4 interrogations and replies. 
MODE 4 RE- Indicates that a mode 4 reply is 
PLY  transmitted. 
IDENT/  The IDENT/OUT/MIC switch is 
OUT/MIC  spring loaded to the OUT position. 
If IDENT operation is desired, the 
switch must be moved to the 
IDENT position momentarily. The 
IDENT pulse trains will be 
transmitted for approximately 30 
seconds. The MIC position is not 
connected in this installation. 
　
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