[GreenKeys] M28ASR wiring

[Duncan Brown]

I'm familiar with the "airline" drawings. They are fine if you want to 
know where a pin or terminal on a connector connects to, but doesn't 
answer my original question of where on the rear terminal strip does the 
external loop connect.

The schematics on the RTTY.COM page help.  It looks like the external 
loop connects to terminals C5 & C15.


Duncan
K2OEQ

On 07-Apr-23 16:40, Jeffrey Golas wrote:
> If you stare at it a bit, its actually not too bad. It shows the 
> terminals and each "plug" they map to, so at a particular terminal it 
> may say something like C-1-RD, it means that terminal goes to plug C, 
> pin 1, wire color RED. Under plug C, pin 1 would say something like 
> T-15-RD, so it saying the other end is terminal 15, color RED. Make sense?
>
> Each major mechanism has a page with each plug shown as a different 
> letter.
>
> The keyboard page breaks the keyboard plug into all the 
> switches/sensors/contacts connected via that plug, so the margin 
> switch may have A-10-BU, for plug A, pin 10, color blue.
>
> Jeff
>
>> On Apr 7, 2023, at 2:58 PM, Duncan Brown <duncanancy at earthlink.net> 
>> wrote:
>>
>>  Jeffery,
>>
>> Thanks, but I l have that document and it is very hard to follow.
>>
>> I did find some schematics at 
>> http://rtty.com/development/teletype/model28ASR/index.html which look 
>> more helpful. (although there are rfreferences to "Notes" which are 
>> not there.)
>>
>> Duncan
>> K2OEQ
>>
>>
>> On 07-Apr-23 14:50, Jeffrey Golas wrote:
>>> I got you fam!
>>>
>>> navy-radio.com <https://www.navy-radio.com/manuals/tty/wd/ugc48a-wd.pdf>
>>> 	<https://www.navy-radio.com/manuals/tty/wd/ugc48a-wd.pdf>
>>>
>>> <https://www.navy-radio.com/manuals/tty/wd/ugc48a-wd.pdf>
>>>
>>> Jeff KC3GJX
>>>
>>>
>>>> On Apr 7, 2023, at 2:24 PM, Duncan Brown <duncanancy at earthlink.net> 
>>>> wrote:
>>>>
>>>>  I'm trying to set up a M28ASR and I need to find the rear 
>>>> terminal strip connections for the printer, keyboard, tape reader 
>>>> and aux reperf. The unit was from a civilian installation, but is 
>>>> referred to as a "UGC-6" on the patch panel.
>>>>
>>>> I've tried to find a basic connection diagram from the 
>>>> documentation on Nick's site, but as Nick once said:
>>>>
>>>>     /"Sometimes I think the Teletype publications group was run
>>>>     like a super-secret govt project - each group wrote about its
>>>>     own little piece, but no one knew how it all got connected
>>>>     together.......except for the document package shipped with
>>>>     each machine which was always discarded within two weeks."/
>>>>
>>>>
>>>> Can someone just give me the rear panel terminal strip connections 
>>>> for the i/o's to/from the cabinet?
>>>>
>>>> I will be wiring everything on separate loops.  When I switch from 
>>>> "LINE" to "TEST", does everything get put into the one local loop?
>>>>
>>>> Thanks,
>>>>
>>>> Duncan
>>>> K2OEQ
>>>>
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