

Figure 42. — The importance of receiver parameters is shown by a comparison of the 

 radar reception of an echo from the growler shown using two different 

 values of minimum discernible signal. Photograph A shows a strong 

 blip on the 20-mile scale (min. dis. sig. = 100 decibels below one milli- 

 watt); and B shows no targets on the 8-mile scale (min. dis. sig. =92 

 dbm). B was taken immediately after A. 



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