. Basic methods for the calibration of sonar equipment. EQUIPMENT AT MOUNTAIN LAKES 81 -TURNTABLE TURNTABLE MOTOR a GEAR TRAIN MANUAL CONTROL AC POWER ROTATOR SHAFT. MOTOR FicuRK 16. Schematic of polar recorder servo .sNsleiii. 1 ho 5F sMuliro coiipkil m the liii )lc is llu- dincKii. I he thyralron servo amplifier conlrolled by the 5C1 suuino iiniiisho ilif |nnvcr loi ilic- '4 lip diive iiuiiiii. usual range plotletl. I'liig-tcniiiuatcd palth toids are used in establishing connections to the electronic circuit and the leijiiired |)o\ver supplies. Operation oi' Pulse System The pul
. Basic methods for the calibration of sonar equipment. EQUIPMENT AT MOUNTAIN LAKES 81 -TURNTABLE TURNTABLE MOTOR a GEAR TRAIN MANUAL CONTROL AC POWER ROTATOR SHAFT. MOTOR FicuRK 16. Schematic of polar recorder servo .sNsleiii. 1 ho 5F sMuliro coiipkil m the liii )lc is llu- dincKii. I he thyralron servo amplifier conlrolled by the 5C1 suuino iiniiisho ilif |nnvcr loi ilic- '4 lip diive iiuiiiii. usual range plotletl. I'liig-tcniiiuatcd palth toids are used in establishing connections to the electronic circuit and the leijiiired |)o\ver supplies. Operation oi' Pulse System The pulse system is made up of a pulse generator, transmitter modulator, and a receiver modulator and pulse rectifier which were designed and built by USRL. When used with (he \'><. to 150-kc system, acoustic pidses to 30 milliseconds in duration may be produced and recorded. The use ot the iniits is illustrated in Figure 17. A continuous single-fre- ijuenc) signal is applied to the input of the trans- milter modulator, which acts as a "gating ; The output of the transmitter modulator is a pulse, that is, a limited train ol constant amplitude ^\â a\es of the signal frecjuency. The length and recurrence rate of these pidses are controlled by the pulse gen-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States. Office of Scientific Research and Development. National Defense Research Committee. Washington, D. C.
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