2.5.2 Connector. Six-pin, female, Marsh and Marine 

 type XSL-6-CCP or equivalent for mating with Marsh 

 and Marine XSL-6-CCR and XSL-6-BCR. 



2.5.3 Connections. The cable and connector shall be 

 wired as shown in figure 1. 



2. 6 Hydrophone -Preamplifier Assembly. 



2. 6. 1 Frequency Response . 9. Hz to 11, 200 Hz ±1 dB. 



2.6.2 Directionality. Omnidirectional, ±1 dB about 

 Z-axis, ±1 dB about X- and Y-axis to 5 kHz, ±3 dB about 

 X and Y axis 5 to 11.2 kHz. The Z-axis is the axis of the 

 cylindrical case (see also section 30). 



2. 6. 3 System Noise. The equivalent sound -pressure 

 levels of the maximum system noise of the hydrophone- 

 preamplifier combination at 25° C shall not exceed the 

 levels shown in figure 3 [in the main text]. Preference will 

 be given to that design which minimizes system noise. 

 Information as to the spectrum levels of the limiting noise 

 shall be furnished by the supplier. 



2. 6. 4 Shielding. The hydrophone and preamplifier 

 shall be electrostatically shielded with the shield insulated 

 from the water. 



2. 6. 5 Acceleration Sensitivity. Preference will be 

 given to that design which minimizes acceleration sensi- 

 tivity. The acceleration sensitivity of the unit shall be 

 stated by the supplier. 



2. 6. 6 Size. Not more than 2. 5-inch diameter by not 

 more than 8-inch length, exclusive of the cable and con- 

 nector. The minimum size consistent with good perfor- 

 mance and economy of construction is desired. 



2. 6. 7 Weight. Not more than 5 pounds. The minimum 

 weight consistent with good performance and economy of 

 construction is desired. 



41 



