Signalman 1 & C - Historic Naval Ships Association

Figure 2-7.—AN/SAT 2 infrared transmitting set.The IR transmitting set consists of two IRtransmitters (beacons), a transmitter control panel, andtwo telegraph keys. The beacons may be operatedseparately or simultaneously by either manual key.Selection of the mode of operation is controlled by thetransmitter control panel. The IR transmitter consistsof a formed brass housing and a dome-shapedhomogeneous tempered glass filter, which encloses a300-watt, 110-volt, T20 clear bulb incandescent lampand reflector. The transmitter control consists of awatertight brass housing with a removable front cover,and contains a switch, four fuses, two indicator lights,two terminal boards, and associated wiring. The frontpanel has a gasket to ensure a watertight fit, and isfastened to the housing by means of eight machinescrews. Two locating pins ensure proper alignment ofthe door and housing. (This control panel is alsoutilized by the yardarm blinkers; however, this blinkeris powered by a separate ship's power supply to ensurethe circuit is inoperable during darken ship.) Thetelegraph key consists of a watertight brass boxcontaining a signaling key, a monitor indicator light,a terminal board, and a capacitor. The watertighthousing consists of a formed and welded steel boxwith a formed steel cover and key guard. The cover isattached to the housing by means of six machinescrews. A locating pin ensures proper alignment. Thebase of the housing has three mounting lugs. Thehinged key guard on the cover protects the key fromdamage when it is not in use. A hold-down leverpermits steady operation of the beacons when placedin the down position.Due to the constant exposure to the elements, strictcompliance with planned maintenance system (PMS)requirements is essential for this equipment.Normally, maintenance is the responsibility of theElectrician's Mates. Cleanliness and upkeep of thelight exteriors are tasks for Signalmen. This upkeepcan be hazardous. Before going aloft, check Man AloftProcedures covered later in this chapter.The most widely used IR transmitting equipmentis the standard 12-inch searchlight fitted with a type-Hhood containing the special filter lens (fig. 2-8). Thelens resembles a sheet of red glass. The light isoperated in the same procedure for regular directionalcommunication, but train must be more accurate.2-7