[GreenKeys] KLINSCHMIT TT-117 WIRING HELP

Mon Dec 4 16:44:36 EST 2017

Duncan,

Back in the “real RTTY” days, it was very rare to see anything in print

about KL TTY’s. In fact, it was rare to see much about Teletype Model 28’s, except for

some articles in the RTTY Journal. Model 26’s and 15’s were the RTTY

workhorses.

Jack K2TTY

From: greenkeys-bounces at mailman.qth.net [mailto:greenkeys-bounces at mailman.qth.net] On Behalf Of Duncan Brown
Sent: Monday, December 4, 2017 4:22 PM
To: Albert Last <al.last at sbcglobal.net>; greenkeys at mailman.qth.net
Subject: Re: [GreenKeys] KLINSCHMIT TT-117 WIRING HELP

Al,

Garble on your last transmission: "can I put this series look in series with keyboard" ???

In the upper right corner of the keyboard is the set of series-loop keyboard contacts (one for Mark & one for Space). Below them is a cylinder with cams spread out around the cylinder. This cylinder is prevented from rotating by a lever. There is a felt clutch behind the cylinder. Pressing a key generates the 5-bit code mechanically on 5 horizontal bars.

On a TT-4  or TT-98 (simpler versions of the TT-117), pressing a key moves the lever out of the way, the cylinder rotates and the staggered cams do a parallel to serial conversion to  open & close the series-loop contacts above the cams.  

In the case of the TT-117, there is also the option for parallel data output directly to the reperf. So if you just wanted to cut tape, you don't want the cam cylinder to rotate and send what you are typing out on the serial line.  I don't remember all the details and I dont have a unit here to look at, but it seems like the solenoid that you are talking about is what allows the cams to rotate.

With the motor running, can you move the solenoid arm while trying to type and see if the cams rotate and interrupt the loop??  

I would assume that the solenoid needs to be energized in order to type onto the loop.  But you can't have the solenoid energized all the time or you would be sending continuous Blanks.  There must be a contact to energize the solenoid somewhere.  I don't know where the switch selection between parallel & serial operation was, but you probably just need to supply some voltage to the solenoid & keyboard switch combination.  

(Seems like there should have been something written up about this mod in RTTY Journal or CQ or 73 magazine???  But shouldn't be too hard to solve it.)

I'll bring home the FGC-25 manual tomorrow, but probably won't be able to look at it until Wednesday. 

Have fun,

Duncan

On 04-Dec-17 13:31, Albert Last wrote:

Back again. Removed solenoid and found 700 ohms in solenoid in series with 500 ohm fixed resistor switched in series with solenoid. will reinstall solenoid in keyboard and ck ckt.

Question: can I put this series look in series with keyboard and 60 ma loop from HAL ST-6 ?

Al

On Monday, December 4, 2017 9:05 AM, Albert Last  <mailto:al.last at sbcglobal.net> <al.last at sbcglobal.net> wrote:

Hi Duncan, Thanks for your input.  I only have the TT-117. So without the Reperf I guess is a major problem. I did remove the keyboard and found that the solenoid that controls the lever to stop the unit from turning is open. Infinite  open. So regardless of reperf or not the coil bad. Oh well....

Thanks all,  Al w6gsq

On Sunday, December 3, 2017 12:21 PM, Duncan Brown  <mailto:duncanancy at earthlink.net> <duncanancy at earthlink.net> wrote:

Al,
The TT-117 was the page printer half of the AN/FGC-25. The other half 
was the TT-178/9: reperf, tape reader and power supply.  Do you have 
both units or just the page printer?

We have an AN/FGC-68 (weather version of the FGC-25) at the AWA Museum 
with a bad power supply and the TT-117 keyboard will not work without 
the power from the reperf unit.

One of the "features" of the AN/FGC-25 was that you could punch tape as 
fast as you could type. There was a special mode for a parallel 
connection from the keyboard to the reperf, instead of normal serial 
connection.  It sounds like that circuitry is what is preventing the 
keyboard from sending serially.

Robert Downs on this list sells manuals and may be able to get you a 
scan of the FGC-25 maintenance manual, TM 11-5815-244-35. (I think I got 
his last paper manual).  I have the maintenance manual at the Museum and 
I can bring it home on Tuesday and scan the schematic.

The operator's & low level maintenance manual for the FGC-25 is TM 
11-5815-244-12 and is available on Google Books.

Have fun & good luck,

Duncan Brown, K2OEQ
USASA  31J30

Antique Wireless Association Museum Asst. Curator, Commercial Equipment
(also Chief TTY operator & repairman)
http://www.antiquewireless.org/

On 03-Dec-17 11:47, Al.Last at sbcglobal.net <mailto:Al.Last at sbcglobal.net>  wrote:
>
> I have been working on my Klienschmit TT-117 tty for the past year. 
> Special thanks to Steve N4TTY for providing me the main drive shaft 
> WITH the gears. I could never have gotten past first base. I now have 
> one remaining problem that some one of you might have knowledge to 
> help me finish this project. My TT-117 is the version that came from a 
> Crypto system.. It has the red light on the front housing; a 1" 
> diameter 18" long cable/connector hanging from left side;  the typing 
> 70 something levers that flip up to remember the key strokes (???); 
> the keyboard rotating disk with a knife lever that stops the rotation 
> once a key stroke occurs (normal knife has two ends - mine has only 
> the start side ). Now the problem....... the unit keeps rotating. It 
> is suppose to stop after it rotates once and wait for the next 
> keyboard selection. There is a solenoid ???? round module directly 
> behind the kyboard that has a flat lever which trips the run/stop on 
> the front right. This lever appears to stop rotation waiting. The two 
> wires from the round module runs to the horizontal sliding red arrow 
> that runs across the faceplate. I DO NOT HAVE ANY INFORMATION on this 
> final problem(s). I don't see any source to activate solenoid?
>
> Sorry for this long email, but after 1 years labor, your input could 
> save me hours of interpurlating.
> Al W6GSQ
>
>
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