PROPAGATION ASPECTS OF EQUIPMENT OPERATION 
IN DECIBELS ABOVE NOISE 
SIGNAL STRENGTH 
\\ 
10 15 20 3 3 
RANGE IN THOUSANDS OF METERS 
45 
Ficure 8. Estimation of ship sizes. (From Coast Artillery Experimental Establishment, England.) 
aes 
Points Are Single Readings Of 
Signal/Noise Ratio 
X 13 November 1943 
@ 30 November 1943 
30 Nov. 1943 
0 @ These 
Measurements showed 
that the set was about 
20db below its 
performance of 13 Nov: 
SIGNAL STRENGTH IN DECIBELS A80VE NOISE 
(o) 
RANGE IN THOUSANDS OF METERS 
Figure 9. Range in thousands of meters. (From Coast Artillery Experimental Establishment, England.) 
Neer NCS 
ee 
50 
459 
