TELETYPE MODEL 28 (CONTINUED)

Model 28 Typing Reperforator
M28-TR-1-300w.jpg

Standard Model: 28-TR??
Military Model: TT-192A/UG
Relatives: Same mechanism used in the M28-ASR
Manufactured: 1951-1960?
Units Produced: ??
Units Remaining: ?? (estimated)
Dimensions (inches): ??
Weight (pounds): ??

Keyboard: (none)
Code: 5-level baudot (ustty or ita2) at 60 wpm (45.5 baud)
Interface: 60-mA current loop (@120VDC typical)
Full- or Half-Duplex; 60/20-mA selectable
Motors: 110-VAC Synchronous, or ??
Options: gears??

The Teletype Corp Model 28 Typing Reperforator...

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The inside of an M28 typing reperf. M28-TR-1b.jpg

This M28 reperf is military model TT-192A/UG. M28-TR-2a.jpg

The tape is mounted on top in the TT-192A/UG, not to the side like the unit above. M28-TR-2b.jpg

You can see the small typewheel to the left. It prints on the top of the chadless paper tape, and punches it from below. M28-TR-3a.jpg

(comment needed) M28-TR-3c.jpg

It's a pretty compact little mechanism! M28-TR-4.jpg


Model 28 Transmitter-Distributor
M28-TD-1.jpg

Standard Model: 28-TD??
Military Model: TT-603/UG, TT-187B/UG
Relatives: Same mechanism used in the M28-ASR
Manufactured: 1951-1960?
Units Produced: ??
Units Remaining: ?? (estimated)
Dimensions (inches): ??
Weight (pounds): ??

Keyboard: (none)
Code: 5-level baudot (ustty or ita2) at 60 wpm (45.5 baud)
Interface: 60-mA current loop (@120VDC typical)
Full- or Half-Duplex; 60/20-mA selectable
Motors: 110-VAC Synchronous, or ??
Options: gears??

The Teletype Corp Model 28 Transmitter-Distributor...

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This is my TT-603/UG unit.

More pics here.
M28-TD-Gil-Front-Left-400w.jpg

At the heart of an M28-TD is a mechanism like this LXD37. M28-TD-(LXD37).jpg

This M28-TD is military model TT-187B/UG. It looks identical to the TT-603/UG -- I don't know the differences. M28-TD-2.jpg


TT-253 (M28-KTR) Keyboard Typing Reperforator
M28-KTR-1-300w.jpg

Standard Model: None?
Military Model: TT-253
Relatives: Same mechanisms used in the M28-ASR
Manufactured: 19??-??
Units Produced: ??
Units Remaining: 3 (estimated)
Dimensions (inches): ??
Weight (pounds): ??

Keyboard: (none)
Code: 5-level baudot (ustty or ita2) at 60 wpm (45.5 baud)
Interface: 60-mA current loop (@120VDC typical)
Full- or Half-Duplex; 60/20-mA selectable
Motors: 110-VAC Synchronous, or ??
Options: gears??

The Teletype Corp TT-253 (Model 28) Keyboard Typing Reperforator...

"It works as a keyboard send-receive unit on the air or punches tape off the air. I've had it hooked in the loop and used the keyboard to send over the air. Since it's brand new, the keyboard action is silk smooth. It's a full chad unit (no lids left attached) and prints along the center where the drive sprocket holes are. The chads get blown out through a chute into a collector bag on the rear. It had 100 wpm gears when I got it, but I put 60 wpm gears in it." [Bill Strangfeld]


Bill Strangfeld's military model TT-253 is a Model 28 Keyboard Typing Reperforator He has three of them -- this one is new in the packing crate! M28-KTR-1.jpg

This is the metal case to Bill's TT-253. M28-KTR-1b.jpg