. Basic methods for the calibration of sonar equipment. EQUIPMENT AT MOUNTAIN LAKES 127. ()5. \VIU093 capacilaiice ami ((iiuliulaiKc briilfie for use at high lieqiiencics. resolution in balancing under severe conditions of wave distortion. The set consists of an amplifier with calibrated gain controls, an oscillator and modulator circuit operating in conjiuiction with a 20-c bantl-pass crystal liltcr, an oiupiit meter, and a regidaled d-c supply circuit operated on 1 ITj-noIi, (')()-( power. The set has been designed to operate through the fre- cjuency range 1 to 150 kc with switches l
. Basic methods for the calibration of sonar equipment. EQUIPMENT AT MOUNTAIN LAKES 127. ()5. \VIU093 capacilaiice ami ((iiuliulaiKc briilfie for use at high lieqiiencics. resolution in balancing under severe conditions of wave distortion. The set consists of an amplifier with calibrated gain controls, an oscillator and modulator circuit operating in conjiuiction with a 20-c bantl-pass crystal liltcr, an oiupiit meter, and a regidaled d-c supply circuit operated on 1 ITj-noIi, (')()-( power. The set has been designed to operate through the fre- cjuency range 1 to 150 kc with switches lo |x'rmit its use as a wide-band or a sharply luned insirumeni. Continuous tuning control from 10 to l.'jO kc is el- fected by the Ireciuency adjustment of the local ;- Portable Signal Generators The Western Electric Company I7B Oscillator is a heterodyne type operating on 60-c power and dcli\er- ing levels up to 160 db vs 10~'" watt into a 135- or 600-ohin load and over a frequency range of f to 150 kc. Below 1 kc the power output decreases and the wave form becomes poor. It is used extensively in im- pedance measurements because of its highly stable and uniform output level, accurate fretjuency calibra- tion, and low harmonic distortion. The Hewlett Packard Oscillator, Model 200-Cr covers a frequency range of 20 c to 200 kc. It is de- signed to deliver a signal level of 150 db vs lO^^" watt into a 1,000-ohm resistive load, although its output is not critically affected by the loading. The total har- monic distortion, imdcr proper operation, is less than 1 per cent. TheMeasiireineiils Coipoyalion Square WaveGen- erator, Model 71. permits rapid determination of the phase and fret[ueiuy characteristics of many types of amplifiers and networks when used in conjunction with a cathotle-ray oscilloscope. The time of rise on the wa\e is aljoiu microsecond with Irequencies Irom 5 to 100,000 (. The Fouiier analysis of these waves shows toniponents that gi\
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