G. SONAR THUMPER (cont'd) 



7. Acoustic power: 1.3 x 10^ watts 



8. Acoustic frequency: 



Approximate range: 200 c.p.s. to several kilocycles 

 Peak: 1.4 kilocycles 



9. Acoustic pulse length: 0.5 millisecond 



10. Acoustic pulse repetition rate: 1/2, 1, 3, or 5 seconds per pulse 



11. Receiver band pass filter network: Adjustable 



High pass: 75 c.p.s. 

 Low pass: 10 kilocycles 



12. Graphic record: 



Scale: to 20, 40, 50, 100, 150, 200» 300, 400, 500, 1,000, 



1,500, and 3,000 fathoms 

 Paper type: Wet, electrosensitive (Alfax A) 

 Paper dynamic range: About 20 db 



13. Net weight: 335 pounds (only Thumper and capacitors) 



14. Relay rack (19 inches wide) panel space: Not known 



15. A. C. power consumption: 2 kilowatts 



16. Evaluation and recommendations: 



Since this equipment has been in operation for only a few 

 months, its performance has not yet been evaluated. 



17. References: X-7 



D-12 



