TM 11-5841-283-12/NAVAIR 16-30APR39-1
1-13. BLOCK DIAGRAM PRESENTATION. (CONT)
THREAT/NONTHREAT DETERMINATION
1.
COMPARATOR (Unit 3). Electronically decides whether received signals meet
necessary conditions to indicate either a threat or a nonthreat. The comparator receives
video signals (high band) are correlated with low band signals, the comparator will activate
the MA lamp and audio alarm system, indicating the presence of an activated SAM
radar complex.
RADAR SIGNAL INDICATOR (Unit 2). Provides visual display warning of a possible
2.
threat. The indicator is divided into four quadrants, each quadrant representing the area
scanned by one of the four spiral antennas located around the aircraft. The indicator
receives direction video signals from the comparator, which are displayed on the indicator
screen as a strobe in the direction of the radar emitter.
3.
CONTROL UNIT (Unit 1). Contains all switching functions necessary to perform self-
tests and select mode of operation.
1-12
