Lecture 3 
+40, 
+30 | 
oF EO 4 =. —t 
ra 
+10 TOTAL 
see 5 
O° d LJ He. | a. te | ERG/CM 
-1O- pe | aaa amos, 
-20 : sanih 35% 
aie aoe: 
8) | 70% (-20dB) 
> -50 | See aeh — 
ros : j | 
ti -70 SS =e oT eA8 ap — 140% (40d8) 
- : | ete FR, 2p 
Pe -B0 Je oh Froeny a 
a -90) : 5-8-6, 
as) 1 tr a: DBO”S C60dB) 
x | | Ory wo 
3 -| a : } | 
» “120 ital sso tee | | ae__ 560% (-B0dB 
caiea LSS. el if ee 5 Py &\ Wes 
fo) i | l 1 Ss = 
é S———— SS Saka __ ore 
Z 150) ie S Sa. Gooas) 
> -160} ) a = SK SS, He | 
a | x \ 
-17O}-— — 4 +] 
> A 
7 -|180— = = 
F 4 200% 
Og Men N.— Cl20dB) 
5 Wh, 
-200 ir — 65 
i 3 
-210) ine L 4500 % (-140 dB) 
-220} | | | 
és ia sill | 
02 04 O06 08 10 2-0 40 60 8010 20 40 
RANGE FROM HYDROPHONE IN NAUTICAL MILES 
Fig. 3.7. Sample contour transmission run in 666 fathoms. 
