[GreenKeys] Re:I hope you can help. Jan Bogue KD6EMW W15 page printer with perf

[wa2hwj at att.net]

The tape punch on the Model 19 keyboard needs a source of 130 VDC of
it's own to operate the punch (a big solenoid).

Jack WA2HWJ


-------------- Original message from gil smith <gil at vauxelectronics.com>: -------------- 


> Hi Jan: 
> 
> At 06:46 PM 11/7/2004, Wndrrt at cs.com wrote: 
> >Gil, how do I get to the page on green keys where I leave my first questions? 
> > Where do I sign in on this group? 
> 
> Well, I signed you up already. If you want to contact me directly, you 
> would mail to gil at vauxelectronics.com, but when you email to 
> greenkeys at mailman.qth.net you are posting your message to the greenkeys 
> group -- so all of your messages have already been posted. If you want to 
> reply to a greenkeys post, and simply hit reply, you will only send it to 
> the person that posted the message. If you reply-to-all, or explicitly 
> paste the greenkeys address into the TO or CC fields, you will reply to the 
> whole group. If it is a discussion on a topic of interest to the group, 
> then please copy greenkeys in your replies. Not only do we get to follow 
> an interesting discussion, but the dialog is archived for future 
> generations. There are just under 300 folks on greenkeys, which is not 
> that many. Once we are all dead the only knowledge of these machines will 
> be the manuals we have stashed (if they don't get trashed) and the 
> discussions on greenkeys. 
> 
> 
> >This is what I have: "The Model 15 perforator transmitter is a combination 
> >transmitter and perforator with an electrically operate character 
> >counter. It 
> >is inserted in the base of a Model 15 printer when the Model 15 printer is 
> >used 
> >in conjunction with a Model 19 table and a Model 14 transmitter distributor. 
> >When this combination of units is used together, it is known as a Model 19 
> >printer set. This is what I have, but I do not have the transmitter 
> >distributor. I have its base where it connects and slides in but not the 
> >unit. 
> 
> Do you have the wide M19 table then? There are about four M14TD units on 
> ebay right now -- you could get one and slide it in. I have a few pics of 
> the M19 at: 
> http://www.vauxelectronics.com/gil/tty/M19.htm 
> 
> The TD is a tape reader. The M15 has the keyboard, the typing unit (the 
> page printer part), and the special paper tape punch. The TD completes the 
> set so you can both punch and read tapes. 
> 
> 
> >I can't 
> >figure the above out. The transmitter distributor must transmit, but does 
> >the 
> >Model 15 printer and keyboard also transmit? 
> 
> The term transmitter distributor is misleading -- it is just a motorized 
> tape reader that has that ability to key a loop with contact closures (the 
> transmitter part), and performs the parallel-to-serial conversion of the 
> hole patterns in the tape for sending each character (the distribution 
> part). Each row of (up to) five holes across the tape represents one 
> character. The TD senses the holes in parallel with small pins, and then a 
> segmented wheel turns and the data is converted into a serial stream of 
> loop-closed/loop-open contact closures. 
> 
> The M15 keyboard also sends serial contact closure data. The printer is 
> driven but data on the loop, via the selector magnets. A quick tty-101 is 
> needed here I suppose: 
> 
> The "loop" is a current loop, usually 60-milliamps (mA), and is usually 
> "neutral," which means data bits are represented by the loop current either 
> flowing (also called "marking"), or current not flowing (also called 
> "spacing"). The loop itself is comprised of a voltage source 
> (traditionally about 120 VDC), and a series power resistor that limits the 
> current to 60-mA. The connectors used for the loop are 1/4" phone 
> plugs/jacks. You probably don't want to use the old loop supplies, since 
> they may have deteriorating rectifiers, capacitors, etc. 
> 
> So this loop (voltage supply and series resistor), is connected such that 
> the current is normally flowing through the loop. TTY components are then 
> inserted into the loop -- ie: they connect in series. So the selector 
> magnets of the M15 typing unit connect in series, and the loop current 
> holds the mechanism in a state where it is ready to see a series of 
> current/no-current bits that correspond to a character. Then you insert 
> something like the M15 keyboard into the loop, and you can type on the 
> keyboard, and the characters will print on the typing unit. You can also 
> connect the TD to the loop, and run a punched tape through it - it will 
> also print on the typing unit. 
> 
> In the case of the special M15 with the attached punch, the tape punch is 
> mechanically driven by the typing unit, and is not an independent 
> component. So if you put blank tape in the punch and enable it, anything 
> that you send to the typing unit will also get punched on the tape. 
> 
> But, the typing unit, keyboard, and TD are all independent. In fact, the 
> typing unit can be on one loop (called the receive loop, usually having a 
> red plug), and the keyboard and/or TD can be on another loop (the tx 
> loop). If the machine is wired for two loops, it is called "full-duplex," 
> and if it is wired for one loop (ie: typing unit, keyboard, and optionally, 
> the TD, all wired in series), it is called half-duplex. 
> 
> gil 
> 
> 
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