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

Tue Nov 8 22:50:23 EST 2016

sorry  sent this when it was not  finished it was  caught in  the que
looks like you  got answers disregard this  ed

In a message dated 11/8/2016 8:48:48 P.M. US Mountain Standard Time,  
greenkeys at mailman.qth.net writes:

In a message dated 11/8/2016 2:19:41 P.M. US Mountain Standard Time,  
hanyou at xsmail.com writes:

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?

ac   for the  motor  etc

the loop is  dc

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?

yes  this is called a loop supply  normally  660 mils  at  120 volts  but   
for  local loop  less can  be used

4.  I do have a variable-voltage transformer… do I  need anything special 
in-between the transformer - like fuses, diodes, etc  ;o ?
no  there is no isolation  use  with an isolation  transformer  for safety

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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