[GreenKeys] Dual tape M28 TD's

[wa2hwj at att.net]

I think he was talking about the readers that can read 5, 6 and 8 level tapes. 
Most of that type are parallel types, with a contact-closure output per "bit". The 
tape gates have moveable guides to accommodate the different-width
tapes. The ones I have seen were "Dataspeed" types, running
in the 600-1000wpm range.  

Jack WA2HWj



-------------- Original message from WA3FRP at aol.com: -------------- 


> Greg, 
> 
> I think you are referencing the Multiple LXD Tape Reader. 
> 
> Here is what I have on this unit: 
> 
> The Model 28 Multiple Transmitter-Distributor is an expanded version of the 
> standard, Teletype LXD tape reading unit. Similar components are 
> incorporated into the multiple set, all driven by one motor. 
> 
> This unit translates 5 level punched tapes into serial line signals, and 
> sends them to one or more receiving locations. Optional code reading contacts 
> are available for parallel-wire output. 
> 
> When used with automatic message numbering systems, an optional "flip-flop" 
> feature makes it possible to number messages in the order in which they are 
> sent. 
> 
> The reader's three heads may be operated at one time, feeding three 
> different locations simultaneously. Each reader may also be operated 
> independently. 
> 
> 
> Another method of operation is to have all three portions of the reader 
> sending data to one location. This is accomplished by placing a different 
> message into each of the three heads of a reader equipped with "flip-flop" 
> action. 
> Thus, as the first potion of tape is completed, the second reader is switched 
> into operation automatically. When the end of that tape is reached, the 
> third head goes into operation. 
> 
> 
> Physical Data: Width 17 3/16 inches; Depth 14 1/2 inches; Height 6 1/2 
> inches; Weight 42 3/4 lb. 
> 
> Speed 60, 75 or 100 WPM. 
> 
> Start, stop and free-wheeling positions on the control levers. 
> 
> Electrical Data: Clutch trip magnet - 115V AC; 120V DC; 50V DC 
> 
> Signaling - 5 level, 7.42 unit, start-stop either 0.020 or 0.060 amp 
> 
> Motor - 115 V AC 60 cycle, 3600 RPM, synchronous 
> 
> Terminals - Quick-disconnect, 36 terminal connect plug 
> 
> 
> 73, 
> 
> Russ WA3FRP 
> 
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