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MOUNTING SHELF 



An aluminum die-cast shelf, shown in Fig. 21, is used for mounting 

 the repeaters on the relay rack bays. The shelf comes in two widths; 

 one holding 8 repeaters is used for 19-inch bays and the second, con- 

 taining 10 repeaters, is used on 23-inch bays. Grooves cut into the base 

 of the shelf match a projection on the repeater to act as a track system 

 for positioning the repeater into its connector socket. The shelf connector 

 is mounted in a small die-cast block which, in turn, is fastened to the 

 shelf by shoulder screws to provide a floating assembly. A tapered key, 

 molded into the repeater casting, engages a slot in the connector block 

 to secure the horizontal alignment, and a tapered pin, at the bottom of 

 the repeater casting, raises the connector block for the vertical align- 

 ment. 



Fifteen mounting shelves can be arranged on standard 11 -foot 6-inch 

 relay rack bays. The maximum complement of repeaters will be 120 

 for 19-inch bays and 150 for 23-inch bays. 



POWER DISTRIBUTION PANELS 



Fabricated power distribution panels which occupy 1 ^-inches of 

 mounting space are used for supplying plate and filament power to the 

 repeater shelves. The primary unit, shown in Fig. 22, is required for 

 furnishing power to the first three repeater shelves and one test-set power 

 outlet. Four sets of plate and filament alarm-type fuses are provided, 

 one set for each shelf and one set for the test power outlet. Four filament- 

 adjusting rheostats are furnished and the panel is equipped with an 

 alarm relay and lamp. Pin jacks are available on the front of the panel 

 to measure the filament voltage. 



A supplementary power distribution panel is available, equipped with 

 plate and filament fuses, rheostats and pin jacks sufficient for six ad- 

 ditional repeater mounting shelves. One primary and two supplementary 

 power panels are required to fully equip an 11-foot, 6-inch bay with 15 

 repeater shelves. Both panels are completely wired in the shop to sim- 

 plify installation. Fig. 23 shows a 19-inch relay bay mounting shelf 

 complete with E2 and E3 repeaters and the two types of power distri- 

 bution panels. 



Repeater Test Set 



A new test set has been developed, which will simplify the installa- 

 tion and maintenance of these devices. This test set has been designed 



