TM 1-1520-238-10 4-70 Change 4 4.34B.1 Radar Countermeasures Set Control Pan- el. Control of the radar jammer is provided by the RDRCM (radar countermeasures) part of the IRCM/ RDRCM control panel (fig 4-20) located on the right side of the pilot instrument panel. The control panel receives 28 vdc from the No. 2 essential dc bus through the PEN AIDS CONTR circuit breaker on the pilot overhead circuit breaker panel. When the control switch is set to STBY, the receiver/transmitter is placed in the warm-up mode (3 minute time period) and the RDR JAM segment on the pi- lot caution/warning panel will illuminate if it senses a fail- ure. When the control switch is set to ON, the radar jam- mer automatically provides jamming power to the transmit antenna upon receipt of threat radar energy at the receive antenna. Setting the control switch to OFF removes pow- er to the radar jammer and the RDR JAM caution/warning light is extinguished. 4.35 COUNTERMEASURES CONTROL PANELS. The countermeasures control panels (fig 4-20), located on the right side of the pilot instrument panel, consist of the radar/infrared countermeasures panel, the chaff dispens- er panel and the radar signal detector control panel. The flare panel is not used. 4.36 DISPENSER KIT M-130. The general purpose dispenser M-130 (fig 4-20) consists of a dispenser control panel located on the right of the pilot instrument panel (fig 2-9), a dispenser assembly, a pay- load module assembly, and an electronic module to dis- pense M-1 Chaff. It provides effective survival counter- measures against radar guided weapons systems. The dispenser subsystem has the capability of dispensing 30 chaff cartridges. The dispenser subsystem receives 28 vdc from the Emergency dc Bus through the CHAFF cir- cuit breaker on the pilot overhead circuit breaker panel. The dispenser subsystem is not monitored by FD/LS. The function of each control/indicator is described in table 4-21. SAFETY PIN AND WARNING STREAMER CHAFF DISPENSER SELECT SWITCH C (CHAFF) OR F (FLARE) ELECTRONIC MODULE SAFE PGRM MAN ARM 3 CHAFF ARM FLARE CONT DISP 0 RADAR SIGNAL DETECTOR CONTROL PANEL (AN/APR-39(V)1 ONLY) PAYLOAD MODULE RADAR / INFRARED COUNTERMEASURES CONTROL PANEL CHAFF COUNTER CONTROL CHAFF DISPENSER CONTROL PANEL DISPENSER ASSEMBLY R I P P L E F I R E M01-189A OFF ON PWR TEST SELF DSCRM AUDIO OFF ON PWR TEST AUDIO + MODE 1 2 RADAR SIGNAL DETECTOR CONTROL PANEL (AN/APR-39A(V)1 ONLY) OFF ON Figure 4-20. Chaff Dispenser and Countermeasures Control Panels