Chapter 7 — COMMUNICATIONS EQUIPMENT AND OPERATIONAL PROCEDURES 



209.340 

 Figure 7-2. — Model 28R/0 Teletypewriter. 



by changing the driving gears located within 

 the equipment. Most of the Navy's teletype- 

 writers are presently operated at 100 words 

 per minute. 



Teletypewriters may be send-receive units 

 or receive units only. They may be designed 

 as floor model, table model, rack mounted, or 

 wall mounted sets. 



Model 28 TT-48( )/UG 



The model 28 send-receive teletypewriter 

 page printers are basically the same. The TT- 

 48( )/UG is a floor model keyboard- sending and 

 page-receiving teletypewriter (fig. 7-3). The 

 TT-48( )/UG provides a means for exchanging 

 typewritten page messages between two or more 



1.217.28 

 Figure 7-3. — Model 28 Teletypewriter TT- 

 48 ( ) /UG. 



ships or stations that are similarly equipped 

 and connected by a radio (or wire) circuit. 

 While transmitting from the keyboard, monitor 

 copy is presented by the typing unit. Hence, 

 messages cannot be transmitted and received 

 simultaneously. 



Model 28 TT-69( )/UG 



Another example of modification is the TT- 

 69( )/UG (fig. 7-4). Except for being installed 



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