MONITOR HYDROPHONE OUTPUT, dB re 1V 
MONITOR HYDROPHONE OUTPUT, dB re 1V 
=20 HAW-15 TEST LAKE PEND OREILLE 21 MAY 1980 1128 IN AiR 
INTERNAL OVERPRESSURE 4.75 psi 
HY DROPHONE LYING ON RIGID SUPPGRTS 
-30 
——— — HYDROPHONE HANGING FROM SOFT 
RUBBER COMPLIANCE 
-40 
-50 
-60 
] 
iH 
i 
70 i 
, | 
I 
il UF 
-80 f SPS ps RS 0 A A a a 
0 30 60 
Hz 
Figure AS. In-air test. 
4 HAW-15 TEST LAKE PEND OREILLE 21 MAY 1980 1140 25 feet 
INTERNAL OVERPRESSURE 5 psi 
-10 
-20 
-30 
-40 
~50 
Hz 
100 
Figure A6. In-water test at 25-foot depth. 
31 
