[GreenKeys] Teletype Model 15 power Q's...

Wed Nov 9 19:42:21 EST 2016

Hi All,

Sorry for the late reply ;o … last night I was glued to the TV set ~o~; .  Ah, I have a lot of emails to go through ;p … my head is spinning xD hahah!  As requested by drlegendre, here are some photos below ;o … right now the unit is sitting in the family room of my basement ;p .  The fiber you see all over it is from a mouse, that had gotten inside of the cloth insulation of the outside case while it was sitting in a basement in Chicago from since the 70’s ;p (yep, drove all the way there and back in two days from Lincoln, NE, just to get it ^_~ ~).  Btw - sorry, I don’t really have a image hosting account to put the photos on, so I had to do it via tinypic ;o .  Also attached are some of the rewiring that has taken place (I forgot to mention the back-left side, when looking from the front - that has been rewired, too ;o ).  The one appears to be one of those selector magnets that I believe I scanned over in one other email ;o (the green magnet).  The person that I got this teletype from also included a coupe of extras (photoed), including an extra typing unit and extra motor… haven’t really examined those yet ;o .  I hope this helps on the identification of this unit a bit :) … i think by the color of the case, it’s from the Army, but I could be wrong ;p .  Anyways, cheers all and hopefully I can get through some of these emails from yesterday-tonight and figure out a few things ^_^ (scratching my head on a few ATTM ;o ~)…..

Thanks again ^^ !!!

Sincerely,
Eric :)

http://i63.tinypic.com/16kynpu.jpg
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http://i67.tinypic.com/1zgu8vo.jpg
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http://i64.tinypic.com/2yvuz2d.jpg
http://i67.tinypic.com/16josya.jpg
http://i65.tinypic.com/j6u1pl.jpg
http://i66.tinypic.com/z7db8.jpg
http://i64.tinypic.com/15mcvgz.jpg
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http://i67.tinypic.com/2a9tvfk.jpg
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http://i66.tinypic.com/2hd8nev.jpg

> On Nov 8, 2016, at 5:10 pm, drlegendre . <drlegendre at gmail.com> wrote:
> 
> It depends on the particular model of M15 you have. The 'standard' model runs from standard 110-120V 60Hz AC. Those models are AC-only, so you're good to go.
> 
> There are other models, designed for operation off DC lines or non-standard AC lines. These models typically have a large PSU box that's mounted on the shelf underneath the TTY and may use a governed motor (which might be AC or DC, I don't recall)
> 
> Any M15 uses a 120V / 60ma DC current source to drive the communications loop - some later models were selectable for 20mA loop. A 12-24V DC supply (with some current limiting, possibly) should work for either in a "local loop" or typewriter mode. 
> 
> Can you link up some pics of your machine? That will help a lot with ID.
> 
> On Tue, Nov 8, 2016 at 3:18 PM, Eric & Jia Bigham <hanyou at xsmail.com> wrote:
> 
> Hi all,
> 
> First, I apologize if I sound simplified in my questions ;o … I’m kind’a still a novice when it comes to circuits ;p (even though I am a ham - general license)… but just want to make sure I have a few things straight before I fire up this Teletype Model 15 that I have - that I got a couple of months ago :) ~...
> 
> First of all, I’ve been having trouble finding out how the Model 15 is powered ;o .  I’ve gotten bits-and-pieces from various people on how the machine should be powered, but nothing definitive ;o .  So my questions :) :
> 
> 1.  I understand that this machine requires both AC and DC power.  Are AC and DC power on separate circuits within the machine?
> 
> 2.  Do I run AC and DC power simultaneously or separately?
> 
> 3.  One person has told me that in order to use it in “typewriter mode”, I would need a DC power supply running at about 24-30vdc in order to activate it.  I would also need AC power, correct?
> 
> 4.  I do have a variable-voltage transformer… do I need anything special in-between the transformer - like fuses, diodes, etc ;o ?
> 
> 5.  If AC power is required with DC and while running in “typewriter mode”, the machine receives the 60ma loop current through the 120vdc dedicated power connector, correct?
> 
> 6.  When running off of they line-in (data), the 120vdc 60ma loop current comes from the data line and not the dedicated DC power line, correct?
> 
> 7.  What should I set the DC transformer voltage to ;o ???  I understand that the voltage requirement needs to be a bit lower than the 120vdc specified.
> 
> 8.  When rotating the machine 180°, there is a part that has two wires and a few bars (sorry, I’m not sure what this part is called) on the base of the unit - right-near side… similar to what one can find in an old, rotary telephone (in a telephone, it opens and closes the telephone circuit when pressing / depressing the hook on the telephone).  This teletype has the two wires cut from it and I can’t find any documentation on this part ;o … what is it and is it critical ;o ???
> 
> 9.  What can I use as a substitute oil plug on the main shaft ;o ???  Mine is missing ~o~; ~…..
> 
> I’m sorry if some of these questions overlap ;o … I’m just trying to exhaust all of my questions and possibilities - to understand everything before doing anything further :) .  For reference, I have three lines/power lines going into the machine.  An AC power line going to terminals 21, 23 and ground.  Dedicated DC power line going to terminals 24 and 25.  Data line (red jack) going to terminals 32 & 41 with a wire connecting terminals 32 & 42 together internally… not sure how this wiring on the data line effects things ;o .  The motor its 120vac synchronous.
> 
> Anyways, simplified explanations please xD hahah - I sometimes can be kind’a dense ;p ~o~; .  Thank you so much in advance for all of your help - I really want to give this a thing a try ;D !
> 
> Cheers ^^ !!!
> 
> Sincerely,
> Eric ^_^
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