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

Tue Nov 8 18:10:19 EST 2016

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 ^_^
> ______________________________________________________________
> GreenKeys mailing list
> Home: http://mailman.qth.net/mailman/listinfo/greenkeys
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:GreenKeys at mailman.qth.net
>
> 2002-to-present greenkeys archive: http://mailman.qth.net/
> pipermail/greenkeys/
> 1998-to-2001 greenkeys archive: http://mailman.qth.net/
> archive/greenkeys/greenkeys.html
> Randy Guttery's 2001-to-2009 GreenKeys Search Tool:
> http://comcents.com/tty/greenkeyssearch.html
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to drlegendre at gmail.com
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.qth.net/pipermail/greenkeys/attachments/20161108/d02dbf25/attachment.html>