Input circuit protection for the receiver section of the transceiver 

 shall be provided. Minimum detectable input signal to the receiver shall 

 be no greater than 0.5 microvolts rms . Maximum receiver gain shall be 

 not less than 100 db and continuouslv adjustable bv a manual panel control, 

 Supplementary time variable gain control (TVO) circuits shall be provided. 



The recorder shall be a high resolution dry or wet paper tvpe unit. 

 Full time sweeps of 1/16, 1/8, 1/4, 1/2, 1, 2, and 5 seconds shall be 

 selectable bv a panel switch, ojr be of the fully programmable tvpe. The 

 stylus drive svstem shall be a solid state system having no gears and shall 

 provide accuracies of 0.1 percent of full scale. Paper feed drive shall be 

 by a stepping motor providing a variable marking densitv which is controlled 

 by a panel control. Scale lines on all ranges sball be generated by a pre- 

 cision clock electronic timing system providing accuracies of 0.01 percent 

 of full scale. Marking intensity shall be continuouslv variable from light 

 grey to intense black. Event markers are to be recorded by manual opera- 

 tion of a panel button or switch, with external iacks for hookup to external 

 circuitry. 



Ten cycles of programming shall be provided for manual operation with 

 selected periods of transmit, receive or gate. A flashing warning light 

 indicating low paper shall be located on the panel - the record display 

 area shall be illuminated with a white light. 



Connecting shielded cables, complete with matching connectors for 

 installation to the equipment, shall be Drovided. 



A comprehensive descriptive information of all components and units 

 of the equipment and conditions of warranty shall be furnished. 



A competent field technician or engineer shall demonstrate and instruct 

 in the operation of the complete svstem aboard a survey vessel under actual 

 operating conditions and effect the adjustments in the system to perfor- 

 mance standards. NCEL shall provide the vessel in the vicinity of Port 

 Hueneme , California. 



The entire system shall be. completely operable from an AGOR class 

 vessel (AGOR-12 or 13, as standard). 



Satisfactory and acceptable performance of the equipment shall include 

 a clear bottom and subbottom record along a profile ranging in water depth 

 from 10 to 1,000 fathoms at a speed of 10 knots. Bottom penetration of 

 200 feet of a muddy bottom in 6,000 feet of water is the minimum performance 

 acceptable. 



35 



