[GreenKeys] A few questions.

[Randy and Sherry Guttery]

I'm beginning to think someone is pulling our collective leg 
here...  Some of these questions / comments are almost 
beyond belief from someone who represents to have a HAM 
license...

However - for the time being I'll go along (again)...  and 
assume these truly are "straight" - and not some gag...

On 1/6/2012 12:30 PM, Jonathan Mc Donald wrote:
> I have found out that my tt-98 is missing a power supply, 
> but don't really understand what that means as far as what 
> the machine can and cannot do.  I read the wiki on loop 
> current, but will have to read it again (and again).  So 
> I'm going to throw some questions out there this morning 
> and head to the mancave to tinker.
1) stay away from "wiki" for anything technical.  It's 
written by anyone who cares to - whether they know what they 
are talking about - or not (and often not).
2) read what's been already supplied / available in 
technical manuals.  THEY have the correct information for 
your unit.
3) one more time - get in touch with RiceGuy.  He is the 
local expert on these machines (as he has shown time and 
again).  Again - his recent resurrection of a Klein is well 
documented my my site http://www.comcents.com/tty/tty.php   
As is noted there - I know quite a bit about Kleins - but 
*nothing* in comparison to what he knows.  I sent you his 
direct email a few days ago.
>
> Without a power supply:
All the "power supply" does is supply of (approximately) 
120V DC through a current limiting resistor such that the 
resulting loop current is 60 (or 20) milliamps).  Any DC 
supply capable of 120V @ more than 60ma will do.  Just be 
sure and have an adjustable current limit resistor in the 
circuit - and a meter to monitor the loop.
> Will my machine be able to print itty from the internet?
With a correct interface.   Computers that have a serial 
interface are not able to handle such high voltage - so some 
level shifting circuits are needed.  There are many 
available.  However - you need to get your machine working 
"locally" (i.e. printing from it's own keyboard) first - 
then worry about printing from itty.  i.e. step at a time.
> Will I be able to send itty to the internet (i'm not sure 
> my machine can do this)?
yes - but again - with the proper interface (hardware - and 
possibly software - depending). Itty is not primarily set up 
for direct input from a baudot tty - but with some software, 
etc. - it can be done.
> Receive rtty over radio waves?
Once you are set up to copy itty over the internet - copying 
from a radio is relatively straight forward.
> Send rtty over radio waves (again, not sure my machine can 
> do this, but suspect it can with a computer and other stuff))?
Same as sending to itty
>
>
>
> There is a DC switch on it.  Can I substitute a 12v 
> battery in place of the power supply?
No.  Read above.
> Would the power supply be an easy or complicated build 
> from scratch?
No - circuits are readily available - as are parts.
> If anyone has one for sale, I'm listening :)
That's also a possibility - but as others have noted some 
tu's (terminal units - audio to tty level adapters) have 
built-in supplies - so take that step at a time.
> Can one purchase a newish power supply that would work 
> with it? (a link would be great for better understanding)?
Sure - but again - find out what options are available 
before jumping on something you might not need.
>
> Restoring:
> Is it customary or frowned up to soak the teletype 
> receiving unit parts?
> What is the best solution?

Get advice from RiceGuy.

> The current plan is oil and fine steel wool.  It seems the 
> least invasive.
Sure - If you're dead set on *destroying* your machine - 
head on.  PLEASE KEEP THE STEEL WOOL AS FAR FROM YOUR 
MACHINE AS POSSIBLE!  I can't think of a faster way to 
destroy bearings.
>
> Yep, all noob question looking for the voice of experience 
> (with surely more to come).
Taking you at your word...   OK - listen to the experts.  
Again - I've given you the best person for Kleins that I know -
> Thanks for your time.
> Jonathan / kg6tgr
>
>

-- 
randy guttery

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