TM 11-5840-281-12-1
2-10. IFF OPERATION. (CONT)
PRECISION MODE
Precision approach (precision mode) of operation utilizes beta-type scans, when the SCAN MODE switch on the master
control-indicator is placed in NORM, 350 EL, or 600 AZ position. Beta scans do not display IFF information. When
operating with a slave control-indicator, by placing the SCAN MODE switch on the slave to IFF position, the slave will
display the IFF reply (no radar target) on a ppi scan. See Precision Approach Operation (para 2-7), and Scan and Video
Presentation Checks in Preliminary Operating Procedure (para 2-5), for the different combination of switch settings and
displayed data when operating in precision mode.
SIMULTANEOUS MODE
In the simultaneous mode of operation, the master control-indicator will have a beta scan and the slave a ppi scan. The
slave will display the radar target and IFF reply at all ranges except 80. When the RANGE MILES switch on the slave is
placed in 80 position, it will display only the IFF reply. When the SCAN MODE switch on the slave is placed in IFF
position, it will display only the IFF reply at all ranges See Simultaneous Mode Operation (para 2-9) for the procedure to
operate in simultaneous mode.
IFF MODE
In the IFF mode of operation, the control-indicators are isolated from the common radar-IFF antenna control system and
controlled directly by the IFF equipment. The SCAN MODE switch on either control-indicator can be placed in IFF
position without affecting the other. Except for precision approaches, the slave cannot display beta scans when the
SCAN MODE switch on the master is in IFF position. IFF information can be received by operating in simultaneous
mode. Only the IFF reply is displayed at all ranges when the SCAN MODE switch on either control-indicator is in IFF
position. See Scan and Video Presentation checks in Preliminary Operating Procedure (para 2-5) for the different
combination of switch settings and displayed data when operating in IFF mode.
VIDEO CLUTTER
See Search Operation (para 2-6) and Precision Approach Operation (para 2-7) for examples of video clutter that may be
encountered during IFF operation. To reduce video clutter, see Search Operation, Reducing Video Clutter (para 2-6).
2-11. STANDBY CONDITION.
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