Aviation Electronics Technician 1 - Historic Naval Ships Association

RecorderThe RO-358/ASQ-13A recorder (fig. 4-16) islocated at the sensor operator’s station and displaysinformation on chart paper. This recorder is used forboth the sonar system and the magnetic anomalydetection (MAD) system. MAD will be discussedlater in this chapter.Figure 4-14.-Dome control.The TRAIL/UNSEATED indicator advises theoperator of the transducer’s position.The RAISE/LOWER switch activates the reelingmachine to either raise or lower the dome. The SEATs witch/indicator is used to raise the transducer fromthe trail position to the seat position, and thenindicates that the transducer is in the seat position.When the operator selects the AUXILIARY RAISEswitch, the transducer will be electrically raised in theevent of a hydraulic malfunction.Hydraulic Cable Reeling MachineThe recorder contains the following switches andindicators on its faceplate: The CHART MOVEswitch provides for rapid chart movement. TheMODE switch selects the mode in which the recorderwill operate. The RANGE RATE switch compensatesfor target range rate when in the aspect mode. APULSE switch enables the operator to select transmitpulse duration while in the aspect mode. TheCONTRAST control allows the operator to controlthe intensity of the recorded trace, while thePATTERN SHIFT knob shifts the information to theleft. The SAD indicator/switch indicates when a SADsignal is being processed, and it resets the SADindication. The REFERENCE switch enables theoperator to select a new stylus during MADoperations.Sonar Hydrophone and Sonar ProjectorThe underwater transmitting and receivingelement consists of a projector (transmitting array)and a hydrophone (receiving array). The combinationof these two components, which are electrically andThe hydraulic cable reeling machine (fig. 4-15)uses a hydraulic motor to raise and lower the dome.The sequence of raising or lowering is accomplishedby energizing solenoids on the hydraulic controlpackage, which programs hydraulic pressure torelease or retrieve the dome.The reel rotates to pay out or retrieve the cable.As the cable goes out or comes in, a level windassembly, mounted on the frame, moves laterally towind or unwind the cable evenly. The level wind ischain-driven from the gearbox assembly.A standard one-half inch, square-drive speedwrench, which comes with the reeling machine, canbe used to manually release or retrieve the cable.When the handcrank is used, the electrical circuits aredisabled.Figure 4-15.-Hydraulic cable reeling machine.4-11