56 ELECTRICAL AND ELECTRONIC SYSTEMS 



Exterior Umbilical Cord Connection 



The communication cable shall be permanently connected through the hull with a pressure- 

 proof stuffing tube near the bottom of the hull. The pressure -proof stuffing tube shall be simi- 

 lar to those shown on BuShips Dwg. 815-1197030. The cable shall terminate in a suitable plug 

 at the communication center inside Sealab. The cable end shall be sealed to prevent the Sealab 

 atmosphere from escaping through the cable jacket and around the conductors. The exterior 

 section of the cable shall extend from the hull penetration to the umbilical connection near the 

 top of top access trunk. Protective guards shall be provided for the exterior cable run. 



Communication Cable 



The communication cable specified for the umbilical cord is Boston Insulated Wire Com- 

 pany No. TV-33N or equal, neoprene jacket, O.D. 0.780 ft ± 0.015 in. Table 2 lists the recom- 

 mended conductor usage. Cables required for other interior communication circuits shall be 

 Navy or commercial types best suited for the application. 



Sealab Communication Center 



A section of the lab bench adjacent to the fan cabinet shall be used for the Sealab commu- 

 nication center. A patch panel shall be designed and installed at this location to facilitate con- 

 necting the various pieces of equipment at the test site. The panel shall have multi-pin recep- 

 tacles for all multiconductor circuits and coax receptacles for the TV circuits. Each receptacle 

 shall be labeled. Plugs shall be provided for each receptacle. Table 2 lists suggested recep- 

 tacles or a particular receptacle if required to mate with an existing plug on the equipment. A 

 panel shall be built and furnished to NOTS, Pasadena, for installation in the CCC van on the sup- 

 port vessel. The panel shall be identical to the Sealab panel, except (a) a switch for the FM 

 speaker is required, and (b) an Amphenol receptacle No. 67-02E14-5S or equal shall replace 

 the two separate receptacles for the audio link to Sealab and shore. A mating plug shall be 

 furnished. A wiring diagram shall also be furnished with the panel. 



Helium Speech Unscrambler 



The helium speech unscrambler is being provided by the Office of Naval Research (ONR) 

 in cooperation with BuShips. The equipment will be shipped to NOTS, Pasadena. Three head- 

 sets are being provided and are to be located as follows: Sealab Communication Center, galley, 

 and berthing space. Cables shall be run to the galley and berthing space and terminated at a 

 convenient location in a receptacle. The conductor and connector requirements are listed in 

 Table 2. 



Electrowriter 



The electrowriter, consisting of a transmitting unit and a receiving unit, will be shipped to 

 NOTS, Pasadena. The conductor and connector requirements are listed in Table 2. 



Television 



The TV units for monitoring and entertainment are being furnished by Scripps Institution 

 of Oceanography. The conductor and connector requirements are listed in Table 2. 



FM Receiver 



The FM receiver and remote speakers will be provided by NOTS, Pasadena. The FM re- 

 mote speakers shall time share the conductors in Quad 1 of the communication cable with the 

 helium speech unscrambler headset (Table 2). A switch shall be provided on the patch panel 



