[GreenKeys] TT-4(*)

[Rich MC Clung]

I guess I'll add alittle fuel to the TT-4 fire.  Here are most of the differences in the models.
  I may have missed a few of the insignificant differences.
   
  RICH  WA6KNW
   
   
  TM-11-5815-206-12
  -       TELETYPEWR SETS, AN/PGC-1 (NSN 5815-00-198-5963) AND AN/PGC-3 (5815-01-012-8773) TELETYPEWRITERS, TT-4A/TG, TT-4B/TG, TT-4C/TG (5815-00-198-4438), TT-335/TG (5815-00-878-8449), TT-537/G (5815-00-926-7378), TT-698/TG, TT-698A/TG, TT-698B/TG (5815-01-008-9628), TT-722/TG AND TT-722A/TG (5815-01-017-9172) 


  TT-4A/TG, TT-4B/TG, TT-4C/TG (5815-00-198-4438)
   
  Teletypewriter TT-4(*)TG requires a source of 105- to 125-volt dc or ac (50- or 60-Hz single- phase) for the teletypewriter motor.
   
  Requires a 20 or 60 mA loop.
   
   
  TT-335/TG (5815-00-878-8449) 
   
  Teletypewriter  TT-335/TG is equipped with heaters which permit operation in extreme cold and operates from 105- to 125-volt, 396- to 404-cps, single-phase alternating current for the teletypewriter motor.
   
  Requires a 20 or 60 mA loop. 
   
   
  TT-537/G (5815-00-926-7378)
   
  Teletypewriter TT-­537/TG is used primarily to receive low-voltage Baudot teletypewriter signals from a Field Artillery Gun Direction Computer (FADAC) and to record the received messages on 8½-inch-wide recording paper
   
  In a typical FADAC system, low-voltage signals from the computer are applied to the receive circuits of Teletypewriter TT-537/TG, where they are amplified to the level required to operate the selector magnet in the teletypewriter receive mechanism.  The keyboard transmission capability is not used in this application.
   
  Low level signaling system. In a typical low level signaling system line signal current is reduced to 100 microampere or less.
   
  The TT-537/G is equipped with heaters which permit operation in extreme cold and operates from 105- to 125-volt, 396- to 404-cps, single-phase alternating current for the teletypewriter motor and for the amplifier circuit.  The TT-537 G may also be operated from a 396- to 404-cps, three-phase. Y connected generator with the motor and electronics powered from one phase and the heaters from the second phase, if the phase-to-neutral voltage is between 105 to 125 volts. 
   
  The TT-537/G will operate on a nominal signal line voltage range of 6 (±1)  volts  and  120 - 130  volts  dc.
   
   
   
  TT-698/TG, TT-698A/TG, TT-698B/TG (5815-01-008-9628)
   
  Teletypewriters TT-698(*)/TG are Teletypewriters TT­-4(*)/TG converted to low level signaling operation, Except for the TT-698(*)/TG's ability to detect and process a much lower level signal, all other existing operational features of the basic teletypewriter TT-4(*)/TG are unchanged.
   
  The TT-698(*)/TG requires a source of 105 to 125 volts ac (50- or 60- Hz, single-phase) for the teletypewriter motor and electronic modules.
   
  Requires a 20 or 60 mA loop. 
   
   
   
  TT-722/TG AND TT-722A/TG (5815-01-017-9172)
   
  Teletypewriters TT-­722(*)/TG are Teletypewriters TT-4B/TG and TT-4C/TG modified to include automatic carriage-return and line-feed mechanisms, and special mounting plates to permit use of the teletypewriters in mobile assemblages.
   
  The TT-722(*)TG requires a source of 105- to 125-volt dc or ac (50- or 60-Hz single- phase) for the teletypewriter motor.
   
  Requires a 20 or 60 mA loop.