Navy Torn Tape Relay Equipment

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Torn Tape Equipment aboard USS Midway

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AN/FGC-79A (3 printers + keyboard)
AN/FGC-100A (4 printers)
Page Printer Monitor Groups ("waterfall")
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TT-333A/UG Transmitter Group 
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TT-332A/UG Monitor Group 
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Torn Tape Equipment aboard USS New Jersey

AN/FGC-79A Printer Group
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AN/FGC-79A Printer Group
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AN/UGT-8 Transmitter Group
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TT-331/UG Receiving Group
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Model 28 Triple TD unit used in Transmitter Group

 

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Message Identification Module used in Transmitter Group (Teletype 173520)
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Principles of Operation - 8MB pdf
Adjustments/Lubrication - 8MB pdf

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Model 28 Tape Relay Equipment

Technical Manual 275B - 109MB pdf

 

 

 

 

 

 

 

 

 

 

 

Receiving Group (6 Typing Reperf)
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Transmitter Group (6 TD)
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Monitor Group (6 Reperf)
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Model 28 Reperforator-Transmitter

 

 

 

 

 

28RT - Reperforator Transmitter Group
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28RT - Reperforator Transmitter Unit
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28RT page - more photos & info

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28RT units in an 82B1 switching center

Model 28 Teletype Equipment High Speed Tape Punch
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Receiver - Transmitter - Monitor

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Receiver - Transmitter - Monitor

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AN/FGC-6 fgc6-spec-101.JPG (113490 bytes) fgc6-spec-102.JPG (78577 bytes) Receiver - Transmitter - Monitor

NAVSHIPS 91899

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AN/FGC-38
AN/FGC-39
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NAVSHIPS 92378

AN/FGC-38A fgc38a-spec-01.JPG (131736 bytes) fgc38a-spec-02.JPG (108594 bytes) Receiver - Transmitter - Monitor

NAVSHIPS 92833

TT-164/FGC-38 Printing Reperf
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TT-168/FGC-39 TD
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T-200/FGC-38A reperf
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TT-201/FGC-38A reperf
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AN/FGC-71 fgc71-spec-01.JPG (126879 bytes) fgc71-spec-02.JPG (133773 bytes) Routing Set

Includes 20 ea. TT-329/UG Reperforators (625 wpm)

NAVSHIPS 94125

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AN/FGC-73 fgc73-spec-01.JPG (166297 bytes) fgc73-spec-02.JPG (136962 bytes) High Speed Routing Set

Includes 22 ea. TT-329/UG Reperforators (850 wpm)

NAVSHIPS 94492

AN/FGR-5 fgr5-spec-01.JPG (287919 bytes) fgr5-spec-02.JPG (71086 bytes) Torn Tape Relay Receiver

Includes 6 ea. TT-315/UG Typing Reperforators
Used with AN/FGT-4 and AN/FGR-6

NAVSHIPS 94158

AN/FGR-5A fgr5-spec-03.JPG (132302 bytes) fgr5-spec-04.JPG (110840 bytes) Torn Tape Relay Receiver

Includes 6 ea. TT-315/UG Typing Reperforators
Used with AN/FGT-4 and AN/FGR-6

AN/FGR-6 fgr6-spec-01.JPG (268308 bytes) fgr6-spec-02.JPG (72993 bytes) Reperforator (Monitor) Set

Includes 6 ea. TT-317/UG Typing Reperforators

NAVSHIPS 94158

AN/FGR-6A fgr6-spec-03.JPG (277963 bytes) fgr6-spec-04.JPG (66360 bytes) Reperforator (Monitor) Set

Includes 6 ea. TT-317/UG Typing Reperforators

 

AN/FGT-4 fgt4-spec-01.JPG (279530 bytes) fgt4-spec-02.JPG (73650 bytes) Transmitter Set

Includes 6 ea. TT-354/UG Transmitter-Distributors

 

AN/TGC-1A - Signal Corps equipment also used by USN) - thanks to Bob K6OSM

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From Dave - "This machine is the grand daddy of tape relay systems. They were nicknamed "Chesters" in their day, as they somewhat resembled a Chest of Drawers. The AN/TGC-1s were probably phased out of military use around 1952, having been replaced by the Korean War vintage AN/TGC-4s (1952), AN/FGC-35s (1955), and AN/FGC-38s (1955 thru 1966 or so). 
The AN/TGC-1s date from around early 1942, and were built both for the Army and Navy at the outset of WW II. They were used on both point to point circuits and on radio teletype "network" circuits (early form of Navy RATT Fleet Broadcast for ships and Army General Broadcast RATT circuits)."
Torn Tape System Parts Manual
(the R-390A title is some strange misprint!)
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Info from 1977 Index of Teletypewriter Equipment (NAVELEX 0967-LP-104-0010)

 

HIGH LEVEL EQUIPMENT (NON-TEMPEST)

 

AN/FGC-59

 Model 28, Torn Tape System, Send-Receive Page Printer Set. Consists of floor cabinet, sprocket feed typing unit, 2 bases, typing reperforator, 6 transmitter distributors, 2 synchronous motors and gears for 45.5 and 74.2 baud. 7.42 unit code, 115VAC, 60 Hz. Includes communication symbol arrangement.

AN/FGC-69

 Model 28 Multiple Page Printer Monitor Group. Consists of floor cabinet, 3 friction feed typing units, keyboard, 3 synchronous motors and gears for 45.5, 56.9 and 74.2 baud. 7.42 unit code, 60 Hz, 115VAC. Includes communication symbol arrangement, 3 paper winders and selective calling feature.

AN/FGC-69X

 Model 28 Multiple Page Printer Monitor Set. Same as AN/FGC-69 except uses (2) LMU28 and (1) LMU41, 50/60 Hz series governed motor units instead of 3 synchronous motor units.

AN/FGC-74

 Model 28 Multiple Page Printer Monitor Group. Consists of floor cabinet, 3 friction feed typing units, keyboard, 3 synchronous motors and gears for 45.5, 50 and 75 baud. 7.00 unit code, 60 Hz, 115VAC. Includes communication symbol arrangement, 3 paper winders and keyboard switching.

AN/FGC-74A

 Model 28 Multiple Page Printer Monitor Group. Same as AN/FGC-74 except includes gears for 75 baud, gold plated contacts in keyboard, two tube drivers and no keyboard switching.

AN/FGC-74X 

Model 28 Multiple Page Printer Monitor Group. Same as AN/FGC-74 except includes 50/60 Hz series governed motors and tuning fork.

AN/FGC-79

 Model 28 Multiple Page Printer Monitor Group. Consists of floor cabinet, 3 friction feed typing units, keyboard, 3 synchronous motors and gears for 45.5 and 74.2 baud. 7.42 unit code, 60 Hz, 115VAC. Includes communication symbol arrangement, 3 paper winders and keyboard switching.

AN/FGC-79A

 Model 28 Multiple Page Printer Monitor Group. Same as AN/FGC-79 except includes stepping magnet in keyboard.

AN/FGC-79AX

 Model 28 Multiple Page Printer Monitor Group. Same as AN/FGC-79A except includes 50 Hz synchronous motors.

AN/FGC-79X

 Model 28 Multiple Page Printer Monitor Group. Same as AN/FGC-79 except includes 50/60 Hz series governed motors.

AN/FGC-96

 Model 28 Multiple Page Printer Monitor Group. Consists of floor cabinet, 3 friction feed typing units, keyboard with gearshift, 3 synchronous motors and gears for 45.5 and 75 baud. 7.00 unit code, 60 Hz, 115VAC. Includes communication symbol arrangement, 3 paper winders and stepping magnet in keyboard.

AN/FGC-96A

 Model 28 Multiple Page Printer Monitor Group. Same as AN/FGC-96 except includes weather character arrangement.

AN/FGC-96X

 Model 28 Multiple Page Printer Monitor Group. Same as AN/FGC-96 except includes 50/60 Hz series governed motors and tuning fork.

AN/FGC-100 

Model 28 Multiple Page Printer Monitor Group. Consists of floor cabinet, 4 friction feed typing units, 4 synchronous motors and gear sets for 75 baud. 7.00 unit code, 60 Hz, 115VAC. Includes communication symbol arrangement and 4 paper winders.

AN/FGC-100A

 Model 28 Multiple Page Printer Monitor Group. Same as AN/FGC-100 except includes contact in stunt boxes for control purposes.

AN/FGC-101

 Model 28 Multiple Page Printer Monitor Group. Same as AN/FGC-100 except includes 50Hz synchronous motors.

AN/FGR-5 

Model 28 Torn Tape Receiver Group. Consists of floor cabinet, 2 bases, (6) RY33 line relays, 2 synchronous motors, 6 fully perforated typing reperforators and gears for 45.5, 50 and 75 baud. 7.00 unit code, 60 Hz, 115VAC. Includes communication symbol arrangement and remote control non-interfering LETTERS tape feed out.

AN/FGR-5A

 Model 28 Torn Tape Receiver Group. Same as AN/FGR-5 except for different cabinet (LBAC243BR) and omission of line relays.

AN/FGR-6

 Model 28 Torn Tape Monitor Group. Consists of floor cabinet, 2 bases, (6) RY33 line relays, 2 synchronous motors, 6 fully perforated typing reperforators, gears for 45.5, 50 and 75 baud and 2 tape winders. 7.00 unit code, 60 Hz, 115VAC. Includes communication symbol arrangement.

AN/FGR-6A

 Model 28 Torn Tape Monitor Group. Same as AN/FGR-6 except for different cabinet (LBAC242BR) and omission of line relays.

AN/FGR-8

 Model 28 Torn Tape Monitor Group Consists of floor cabinet, 2 bases, 2 series governed motors, 6 fully perforated typing reperforators, gears for 75 baud and 2 tape winders. 7.00 unit code, 47-63 Hz, 115VAC. Includes communication symbol arrangement. CRITICOM type.

AN/FGR-9

 Model 28 Torn Tape Receiver Group. Consists of floor cabinet, 2 bases, 2 series governed motors, 6 fully perforated typing reperforators, 2 (LMU) plates, tuning fork. 7.00 unit code, 50/60 Hz, 115VAC. Includes communication symbol arrangement.

AN/FGT-4

 Model 28 Torn Tape Transmitter Group. Consists of floor cabinet, 2 bases, 2 synchronous motors, 6 transmitter distributors and gears for 45.5, 50 and 75 baud. 7.00 unit code, 60 Hz, 115VAC. Includes 6 numbering modules for 6 circuit or 3 circuit tandem operation.

AN/FGT-6

 Model 28 Torn Tape Transmitter Group. Consists of floor cabinet, 2 bases, 2 series governed motors, 6 transmitter distributors and gears for 75 baud. 7.00 unit code, 47-63 Hz, 115VAC. Includes 3 numbering modules for three circuit tandem operation. CRITICOM type.

AN/GGA-19

 High Speed Tape Punch Set. Consists of punch, base, cover, tuning fork, and synchronous motor unit. Free speed 1100 WPM. 5-8 code level; 11/16 or 1 in. fully perforated tape. 50/60 Hz synchronous motor, 110 CPS.

AN/GGA-20

 High speed Tape Reader Set. Consists of reader, base, cover, synchronous motor unit. Transmitting speed 1071 WPM. 5-8 code level; 11/16, 7/8 or 1 in. fully perforated tape. 60 Hz synchronous motor, 107 CPS.

AN/GGC-12

Model 28 Torn Tape Multiplication, for use with route line segregators. Consists of floor cabinet, 2 bases, 4 fully perforated typing reperforators, 2 synchronous motors, and gears included in base for 75 baud. unit code, 60 Hz, 115VAC.

AN/GGR-1

 Model 28 Torn Tape Receiver Group. Consists of floor cabinet, base, 6 fully perforated typing reperforators, 2 synchronous motors, and gears included in base for 75 baud. Six 177010 selector magnet drivers instead of 6 vacuum tube keys. 7.00 unit code, 60 Hz, 115VAC. Includes communications symbol arrangement.

AN/GGR-1A

 Model 28 Torn Tape Receiver Group. Same as AN/GGR-1 except it has an additional sprocket for 45.5 baud.

AN/GGR-1X

 Model 28 Torn Tape Receiver Group. Same as AN/GGR-1 except uses 2 series governed motors 50/60 Hz with speed indicator lights instead of synchronous motors, and a tuning fork. Also has an additional sprocket for 45.5 baud.

AN/GGR-2

 Model 28 Torn Tape Monitor Group. Consists of floor cabinet, 2 bases, 2 synchronous motors, 6 fully perforated typing reperforators, gears for 75 baud and 2 tape winders. 7.00 unit code, 60 Hz, 115VAC. Includes communications symbol arrangement.

AN/GGR-2A

 Model 28 Torn Tape Monitor Group. Same as AN/GGR-2 except it has additional sprockets for 45.5 baud.

AN/GGR-2X 

Model 28 Torn Tape Monitor Group. Same as AN/GGR-2 except includes series governed motors and tuning fork.

AN/GGT-3

 Model 28 Torn Tape Transmitter Group -i Consists of floor cabinet, 2 bases, 6 transmitter distributors, 2 synchronous motors and gears for 75 baud. 7.00 unit code, 60 Hz, 115VAC, 6 channels. Wired for polar transmission.

AN/GGT-3X

 Model 28 Torn Tape Transmitter Group. Same as AN/GGT-3 except uses 50/60 Hz series governed motors instead of synchronous motors.

AN/GGT-4

 Model 28 Torn Tape Transmitter Group. Same as AN/GGT-3 except not wired for polar transmission.

AN/UGC-17

 Model 28 Reperforator-Transmitter Set. Consists of floor cabinet, 2 bases, 2 reel assembly tapes, 2 transmitter distributors, 2 typing reperforators and 2 synchronous motors. 7.00 unit code, 60 Hz, 115VAC. Includes communication symbol arrangement.

AN/UGC-31

 Model 28 Reperforator, Transmitter Group. Consists of floor cabinet, base, 2 transmitter distributors, 2 typing reperforators and 2 synchronous motors. 7.00 unit code, 60 Hz, 115VAC. Cabinet equipped with (2) 177010 selector magnet drivers in lieu of vacuum tube driver.

AN/UGC-45

 Model 28 Reperforator Transmitter Group. Same as AN/UGC-31 except uses (2) 50/60 Hz series governed motors LMU13 in lieu of 60 Hz synchronous motors LMU11.

AN/UGC-65

 Model 28 Torn Tape Transmitter Group. Consists of floor cabinet, 2 bases, 2 synchronous motors, 6 transmitter distributors and gears for 45.5, 56.9 and 74.2 baud operation. 7.42 unit code, 60 Hz, 115VAC. Includes 6 numbering modules for 6 circuit or 3 circuit tandem operation. Same as AN/FGT-4 except includes 7.42 unit code operation.

AN/UGC-68

 Model 28 Torn Tape Receiving Group. Consists of floor cabinet, 2 bases, 6 typing reperforators, 2 synchronous motors and gears for 74.2 baud. Cabinet has selector magnet driver and open line detector instead of line relay. 7.42 unit code, 60 Hz, 115VAC.

AN/UGC-108

 Model 28 Multiple Page Printer Monitor Group. Consists of floor cabinet, 3 friction feed typing units, keyboard with gearshift for 45.5, 56.9 and 74.2 baud, 3 synchronous motors and gears for 74.2 baud. 7.42 unit code, 60 Hz, 115VAC. Includes communication symbol arrangement, 3 paper winders and stepping magnet.

AN/UGR-19

 Model 28 Torn Tape Receiver Group. Consists of floor cabinet, 2 bases, 2 series governed motors, 6 chadless typing reperforators and gears for 75 baud. Includes communication symbol arrangement and remote control non-interfering LETTERS tape feed out. 7.00 unit code, 47-63 Hz, 115VAC.

AN/UGR-20

 Model 28 Torn Tape Monitor Group. Consists of floor cabinet, 2 bases, 2 series governed motors, 6 chadless typing reperforators, gears for 75 baud and 2 tape winders. 7.00 unit code, 47-63 Hz, 115VAC. Includes communication symbol arrangement.

AN/UGT-8

 Model 28 Torn Tape Transmitter Group. Consists of floor cabinet, 2 bases, 2 series governed motors, 6 transmitter distributors and gears for 75 baud. 7.00 unit code, 47-63 Hz, 115VAC. Includes 6 numbering modules for 6 circuit or 3 circuit tandem operation.

TT-308/UG

 Model 28 Torn Tape Receiver Group. Consists of floor cabinet, 2 bases, 2 synchronous motors, 6 fully perforated typing perforated and gears for 45.5 and 75 baud. 7.00 unit code, 60 Hz, 115VAC. Includes communication symbol arrangement. CRITICOM type.

TT-308A/UG  Model 28 Torn Tape Receiver Group. Same as TT-308/UG except uses cabinet LBAC260BR, 45.5 baud is eliminated.
TT-308X/UG  Model 28 Torn Tape Receiver Group. Same as TT-308/UG except includes series governed motors. CRITICOM type.
TT-309/UG  Model 28 Torn Tape Monitor Group. Consists of floor cabinet, 2 bases, 2 synchronous motors, 6 fully perforated typing reperforators, gears for 45.5 and 75 baud and 2 tape winders. 7.00 unit code, 60 Hz, 115VAC. Includes communication symbol arrangement. CRITICOM type.
TT-309A/UG  Model 28 Torn Tape Monitor Group. Same as TT-309/UG except uses cabinet LBAC259BR, includes two tube driver. CRITICOM type.
TT-310/UG  Model 28 Torn Tape Transmitter Group. Consists of floor cabinet, 2 bases, 2 synchronous motors, 6 transmitter distributors and gears for 45.5 and 75 baud. 7.00 unit code, 60 Hz, 115VAC. Includes 3 numbering modules for tandem operation and stepping magnets. CRITICOM type.
TT-310A/UG  Model 28 Torn Tape Transmitter Group. Same as TT-310/UG except includes gold plated contacts. CRITICOM type.
TT-329/UG  High Speed Tape Punch Set. Consists of typing reperforator, base, cover and synchronous motor. Transmitting speed 1100 WPM. 8 code level, 1 inch fully perforated tape. 60 Hz synchronous motor, 110 CPS.
TT-331/UG  Model 28 Torn Tape Receiver Group. Consists of floor cabinet, 2 bases, 2 synchronous motors, 6 fully perforated typing reperforators and gears for 45.5, 56.9 and 74.2 baud. 7.42 unit code, 60 Hz, 115VAC. Includes communication symbol arrangement and remote control non-interfering LETTERS tape feed out.
TT-331A/UG  Model 28 Torn Tape Receiver Group. Same as TT-331/UG except uses cabinet LBAC231BR and has additional gears to include 50 baud.
TT-332/UG  Model 28 Torn Tape Monitor Group. Consists of floor cabinet, 2 bases, 2 synchronous motors, 6 fully perforated typing reperforators, 2 tape winders and gears for 45.5, 56.9 and 74.2 baud. 7.42 unit code, 60 Hz, 115VAC. Includes communication symbol arrangement.
TT-332A/UG  Model 28 Torn Tape Monitor Group. Same as TT-332/UG except uses cabinet LBAC242BR equipped with selector magnet drivers and has additional gears to include 50 baud.
TT-333/UG  Model 28 Torn Tape Transmitter Group. Consists of floor cabinet, 2 bases, 2 synchronous motors, 6 transmitter distributors and gears for 45.5, 56.9 and 74.2 baud. 7.42 unit code, 60 Hz, 115VAC. Includes communication symbol arrangement.
TT-333A/UG

 Model 28 Torn Tape Transmitter Group.Same as TT-333/UG except uses different cabinet, base units and has additional gears to include 50 baud. Includes 3 numbering modules for tandem operation.

TT-350/UG

 High Speed Tape Punch Set. Consists of punch, base, cover and synchronous motor. 5 level, 60 Hz, 63.3 CPS, 11/16 in. fully perforated tape.

TT-403/UG

 Model 28 Torn Tape Receiver Group. Same as TT-331/UG except uses series governed motor.

TT-403A/UG

 Model 28 Torn Tape Receiver Group. Same as TT-331A/UG except includes 50 Hz synchronous motors and gears for 45.5 and 74.2 baud.

TT-404/UG  Model 28 Torn Tape Monitor Group. 4C Same as TT-332/UG except uses series governed motor.
TT-404A/UG  Model 28 Torn Tape Monitor Group. Same as TT-332A/UG except includes 50 Hz synchronous motors and gears for 45.5 and 74.2 baud.
TT-405/UG  Model 28 Torn Tape Transmitter Group. Same as TT-333/UG except uses series governed motor.
TT-405A/UG  Model 28 Torn Tape Transmitter Group. Same as TT-333A/UG except includes 50 Hz synchronous motors and gears for 45.5 and 74.2 baud.
TT-461/UG  Model 28 Torn Tape Monitor-Transmitter Group. Same as AN/FGC-59 except uses two 50 Hz synchronous motors in lieu of 60 Hz synchronous motors and uses modified typing perforators.
TT-461A/UG  Model 28 Torn Tape Monitor-Transmitter Group. Same as TT-461/UG except includes 3 numbering modules in cabinet for tandem operation.
TT-462/UG  Model 28 Torn Tape Monitor-Transmitter Group. Same as AN/FGC-59 except uses modified typing perforators.
TT-462A/UG  Model 28 Torn Tape Monitor-Transmitter Group. Same as the TT-462/UG except uses cabinet LBAC240BR.
T-509/UG  Teletype High Speed Tape Punch Set. Consists of cover, fully perforated non-typing punch, synchronous motor, base and drive parts for 110 operations per second. 50 Hz, 115VAC. Includes parallel wire input to code and feed magnets of 1 amp. at 28VDC, chad box and manual tape feed out. Fully perforates 11/16" wide tape and is capable of edge notching the sides of the tape.
TT-556/UG  Model 28 Torn Tape Transmitter Group. Same as TT-310/UG except includes 50 Hz synchronous motor and gears for 45.5, 50 and 75 baud. CRITICOM type.
TT-575/UG

 Teletype High Speed Tape Punch Set. Same as TT-509/UG except includes 60 Hz synchronous motor.

TT-622/UG

 Model 28 Torn Tape Transmitter Group (Miniature Size). Consists of cover, transmitter distributor, base, series governed motor, tuning fork and gears for 74.2 baud. 7.42 unit code, 50/60 Hz, 115VAC. Includes communication symbol arrangement.

 

LOW LEVEL EQUIPMENT (TEMPEST)

 

AN/UGC-56

 Model 28 Low Level Torn Tape Monitor Group. Consists of floor cabinet, 2 bases, 2 series governed motors, 6 fully perforated typing reperforators, gears for 45.5 and 75 baud and 2 tape winders. 7.00 unit code, 47-63 Hz, 115VAC. Includes communication symbol arrangement, MIL-STD-188B six volt polar interface and Teletype's TEMPEST feature. CRITICOM type.

AN/UGC-61  Model 28 Low Level Multiple Page Printer Monitor Group. Consists of floor cabinet, 3 friction feed typing units, keyboard, 3 synchronous motors and gears for 45.5 and 74.2 baud. 7.42 unit code, 60 Hz, 115VAC. Includes communication symbol arrangement, MIL-STD-188B six volt polar interface, Teletype's TEMPEST feature, automatic carriage return and line feed, carriage return with line feed and 3 paper winders.
AN/UGC-61A  Model 28 Low Level Multiple Page Printer Monitor Group. Same as AN/UGC-61 except includes more rigid cabinet and parts for bulkhead mounting.
AN/UGC-61X  Model 28 Low Level Multiple Page Printer Monitor Group. Same as AN/UGC-61 except includes 50 Hz synchronous motors.
  AN/UGC-61Y Model 28 Low Level Multiple Page Printer Monitor Group. Same as AN/UGC-61 except includes series governed motors and gears for 74.2 baud. 
AN/UGR-10  Model 28 Low Level Multiple Page Printer Monitor Group. Consists of floor cabinet, 4 friction feed typing units, 4 synchronous motors and gears for 75 baud. 7.00 unit code, 60 Hz, 115VAC. Includes communication symbol arrangement, MIL-STD-188B six volt polar interface, Teletype's TEMPEST feature, automatic carriage return and line feed, carriage return with line feed and 4 paper winders.
AN/UGR-10A  Model 28 Low Level Multiple Page Printer Monitor Group. Same as AN/UGR-10 except includes more rigid cabinet and parts for bulkhead mounting.
AN/UGR-10X  Model 28 Low Level Multiple Page Printer Monitor Group. Same as AN/UGR-10 except includes 50 Hz synchronous motors.
AN/UGR-10Y  Model 28 Low Level Multiple Page Printer Monitor Group. Same as AN/UGR-10 except includes series governed motors.
AN/UGR-11  Model 28 Low Level Torn Tape Monitor Group. Consists of floor cabinet, 2 bases, 2 synchronous motors, 6 fully perforated typing reperforators, gears for 45.5, 50 and 75 baud and 2 tape winders. 7.00 unit code, 60 Hz, 115VAC. Includes communication symbol arrangement, MIL-STD-188B six volt polar interface and Teletype's TEMPEST feature.
AN/UGR-12  Model 28 Low Level Torn Tape Receiver Group. Consists of floor cabinet, 2 bases, 2 series governed motors, 6 fully perforated typing reperforators, gears for 45.5, 50 and 75 baud. 7.00 unit code, 47-63 Hz, 115VAC. Includes communication symbol arrangement, MIL-STD-188B six volt polar interface and Teletype's TEMPEST feature. CRITICOM type.
AN/UGR-13

 Model 28 Low Level Torn Tape Monitor Group. Consists of floor cabinet, 2 bases, 2 series governed motors, 6 fully perforated typing reperforators and gears for 75 baud. 7.00 unit code, 47-63 Hz, 115VAC. Includes communication symbol arrangement, MIL-STD-188B six volt polar interface and Teletype's TEMPEST feature. CRITICOM type.

AN/UGT-4

 Model 28 Low Level Torn Tape Transmitter Group. Consists of floor cabinet, 2 bases, 2 synchronous motors, 6 transmitter distributors and gears for 75 baud. 7.00 unit code, 60 Hz, 115VAC. Includes 3 numbering modules for tandem operation, MIL-STD-188B six volt polar interface and Teletype's TEMPEST feature. CRITICOM type.

AN/UGT-4X  Model 28 Low Level Torn Tape Transmitter Group. Same as AN/UGT-4 except includes series governed motors. CRITICOM type.
AN/UGT-5  Model 28 Low Level Torn Tape Transmitter Group. Consists of floor cabinet, 2 bases, 2 synchronous motors, 6 transmitter distributors and gears for 74.2 baud. 7.42 unit code, 60 Hz, 115VAC. Includes 3 numbering modules for tandem operation, MIL-STD-188B six volt polar interface and Teletype's TEMPEST feature.
AN/UGT-6  Model 28 Low Level Torn Tape Transmitter Group. Consists of floor cabinet, 2 bases, 2 synchronous motors, 6 transmitter distributors and gears for 74.2 baud. 7.42 unit code, 60 Hz, 115VAC. Includes 6 numbering modules, MIL-STD-188B six volt polar interface, and Teletype's TEMPEST feature.
AN/UGT-6A  Model 28 Low Level Torn Tape Transmitter Group. Same as AN/UGT-6 except includes more rigid cabinet and parts for bulkhead mounting.
AN/UGT-7  Model 28 Low Level Torn Tape Transmitter Group. Consists of floor cabinet, 2 bases, 2 synchronous motors, 6 transmitter distributors and gears for 75 baud. 7.00 unit code, 60 Hz, 115VAC.Includes 6 numbering modules, MIL-STD-188B six volt polar interface and Teletype's TEMPEST feature.CRITICOM type.
TT-576/UG  Model 28 Low Level Torn Tape Receiver Group. Same as AN/UGR-12 except includes 60 Hz synchronous motors. CRITICOM type.
TT-576A/UG  Model 28 Low Level Torn Tape Receiver Group. Same as TT-576/UG except includes more rigid cabinet, parts for bulkhead mounting and gears for 75 baud only. CRITICOM type.
TT-577/UG  Model 28 Low Level Torn Tape Monitor Group. Same as AN/UGR-13 except includes 60 Hz synchronous motors and gears for 45.5, 50 and 75 baud. CRITICOM type. 
TT-578/UG  Model 28 Low Level Torn Tape Receiver Group. Same as TT-576/UG except includes 50 Hz synchronous motors. CRITICOM type.
TT-579/UG  Model 28 Low Level Torn Tape Monitor Set. Same as TT-577/UG except includes 50 Hz synchronous motors. CRITICOM type.

NAVCOMMSTA Guam photos thanks to Rodney Rood
NAVCOMMSTA GUAM
1968-69
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NAVCOMMSTA GUAM
1968-69
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NAVCOMMSTA GUAM
1968-69
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