TM 1-1520-240-104-1-3Figure 4-1-1. Radar Signal Detecting Set Indicator4-1-2. CONTROLS AND FUNCTION, RADAR SIGNALDETECTING SET INDICATORCONTROLS/INDICATORFUNCTIONMA LampsNot used in the AN/APR-39A(V)1 system.BRIL ControlSets indicator displaybrightness. Turn clock-wise to increase bright-ness. Adjust for bestreadable display of plus(+) symbol.MA LampSwitchNot used in the AN/APR-39A(V)1 system.CONTROLS/INDICATORFUNCTIONPlus (+) SymbolDisplayed in the center ofindicator during operationand self-test. Plus (+)symbol flashes to letoperator know when thesystem is operating in adense signal environmentand threat detection isdegraded.Tick MarksThe 12 outer edgemarkings on the indicatorgraticule, represent clockpositions relative toaircraft heading.Threat SymbolTypical Threat
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