[GreenKeys] Teletype M12 KSR owners

Fri Jan 23 22:39:00 EST 2015

All...

Check the "New RTTY Handbook" for the wiring mods and the vacuum tube keyer
circuit. 

Coincidentally, the Model 12 shown in that handbook belonged to Andy, W2AKE.
When I got into RTTY as a teenager, his sister was our next door neighbor
and she heard
the Model 26 one day while visiting my mother. That's when she mentioned
her brother and his call letters. I immediately recalled his call from the
Model 12 in the handbook. I never did get to talk to him...

Jack K0TTY

-----Original Message-----
From: GreenKeys [mailto:greenkeys-bounces at mailman.qth.net] On Behalf Of Doug
Alderdice
Sent: Friday, January 23, 2015 8:19 PM
To: greenkeys at mailman.qth.net
Subject: Re: [GreenKeys] Teletype M12 KSR owners

My M12, sadly, is not running.  The individual components are functional,
i.e. I can power up the motors on the keyboard and the printer and they run
and they are mechanically complete, but the machine as a whole does not run.
I acquired my machine in the early 90s from an older local ham when he was
downsizing and he had completely rewired the machine to work with a tube
keyer to minimize the RFI when using it on the air.  The keyer was not
operating, there were no schematics, etc. 
He had completely rewired the table to work with the keyer ... and had done
things like wire the power leads to the printer and keyboard motors with 20
AWG wire!!

I removed all of his wiring and have tried to get it back to original, yet
all I get on the machine are random characters.  The keyboard works as I can
drop it into the local loop here and can type on it just fine to the other
machines in the collection.

I am fighting a number of variables: the condition of the contacts on the
table and the keyboard and printer, the contact block on the table is
cracked and needs to be glued or epoxied back together, and the keyboard
itself has been completely rewired at one time and the last time I spent
some time with the project I had come to the conclusion that contact wiring
on the keyboard doesn't match a schematic that I have for the M12 keyboard.

When I first got the machine I set it up on the kitchen table one evening
and hooked it up with every clip lead I own and managed to be able to type
on the keyboard and have it print on the printer.  I recall that I couldn't
type at full speed on the keyboard and have the printer follow accurately
and all of the machinery made a tremendous racket, as well as the electrical
part of it creating a ton of RFI.  So I know it
*should* work, but that table wiring is proving to be elusive for something
that should be relatively simple.  And of course there is never enough time
for all of the projects.

I do have the cover for the machine.  I will try to get some photos and
measurements of it.  I believe Don needs that information as well and I
think I promised him that a long time ago :redface:

I haven't been to the AWA museum yet.  It's been a "gee, we should do that
sometime" item for a local ham radio buddy and me for some time now, but we
haven't managed to do it.

Oh, and yes, you do need a separate DC supply to run the selector magnets in
the printer.

73,

Doug, KA2WFT

On 1/23/2015 8:51 PM, Duncan Brown wrote:
> Doug Alderdice
> Steve Ripper
> Gerry Block
>
> Is your M12 working??
>
> I'm looking a the M12 schematic, fig 2.2a1, in Kretzman's RTTY Handbook.
> Am I correct that you need a separate 110VDC, _260 ma_ supply just for 
> the selector magnets (separate from the loop supply)?
>
> The unit we have has a new terminal strip with new wiring and about 
> the right number of terminals, so I am assuming (hoping!) it is wired 
> similar to fig 2.2a1. (unit is at the Museum, so I won't get to play 
> with it again until Tuesday.)
>
> What holds the paper roll? Is it mounted on the cover? (I don't have 
> the
> cover.)  There was a sheet-metal u-bracket mounted to the inside of 
> the table.  It was falling off, so I removed it.  But now I am 
> thinking maybe its purpose was to hold the paper roll!  (I think that 
> I can "borrow" a bracket from a M26.)
>
> Doug - we are practically neighbors!  Have you ever been to the AWA 
> Museum??  We have lots of TTYs (besides wireless equipment).  Come 
> over some time & I give you a personal tour!
>
> Thanks & have fun,
>
> Duncan Brown, K2OEQ
> USASA  31J30
>
> Antique Wireless Association Museum Asst. Curator, Commercial 
> Equipment (also Chief TTY operator & repairman) 
> http://www.antiquewireless.org/
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