TM 11-5840-281-12-1
1.14.
SYSTEM PRINCIPLES OF OPERATION. (CONT)
When the surveillance function (search mode) is used, the operator can detect small aircraft within a radius of 25 miles
and large aircraft within a 40-mile radius. When associated IFF equipment is used, IFF transponder-equipped aircraft
may be detected up to 80 miles. Targets are detected and their range and azimuth are displayed on a ppi display. The
operator can then guide the aircraft, using radio communication, into the correct position for making an approach to the
airfield.
During the surveillance function, when challenging with auxiliary IFF equipment, the target and coded "blip" is present on
the 5-, 10-, 20-, and 40-mile range displays. On the 80-mile range display, only the IFF target is present. The IFF
information provides the operator with a quick means of target Identification.
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