[GreenKeys] asr dual TDs

Mon Apr 10 16:49:39 EDT 2023

Ken, Tim et al,

I was going to ask if it looked like to regular TDs, or one of them was 
a climber.  It will make a difference on the wiring.  The common two 
head would be LXD single contact TDs.  Unless one's a LX  (or maybe all 
doubles are 1 LXD and 1 LX, might be some logic to that?).

The climber would be an LCXD and you can only use one at a time since 
they share the same distrubutor.  (I wonder if they ever made a version 
with an LD mounted on the LCXB so you could use them independently?)

Then for various ides on ASR wiring,

FAA: https://www.navy-radio.com/manuals/tty/28ASR-FAA-IMD-D-439.pdf

You can ignore the right hand side pretty much and there are a couple of 
extra features on the left as well.

WU: https://www.navy-radio.com/manuals/tty/wd/wu9797wd.pdf

You most likely don't have that one, but if you ignore terminal numbers 
in many cases, it's another way to illustration how things work.

WE: (Western Electric, Teletype's parent) 
https://www.navy-radio.com/manuals/tty/wd/w0700-6105.pdf

Navy: https://www.navy-radio.com/tty/asr/ugc6-schem-01.pdf

It is helpful when looking for documentation to have all the name plate 
data you can find.

Unfortunately you will find Teletype model numbers, Bell System numbers 
or JAN (military) numbers on the equipment.  Later military manuals seem 
to have Teletype number in them.

Teletype models for 28 and 35 equipment are like LP9 for printer, LK21 
for keyboard, and LMU3 for motor unit.

Bell Systen uses number like 28B printer, 28B keyboard  28E cabinet.  
28x is useless without a word description to go with it. (I really don't 
like their system)

There are various charts that will reference you back to the Teletype 
number (or the other way around depending on what documents you have) 
from Bell or military numbers.

BSPs will have either Bell System numbers or Teletype model numbers or 
sometimes only a word description for a title.

Bulletins are AFAIK are all strictly Teletype documents.  (Maybe not?  I 
now recall seeing Bell numbers in some)

Personally I prefer BSPs, only because I was brought up on them years 
ago.  You really need to try all varieties to work out puzzles at times. 
Fortunately they all use Teletype part numbers, although you'll see if 
you were a Bell System employee you'd add TP as a prefix.  Military 
makes you work for it with all their tables and references back and 
forth.  Later ones seem better. Teletype and Bell put the P/N right on 
illustrations in the parts sections.  Earlier military manuals used 
their own reference numbers that then had to go to the tables to find 
the real number.

---
----
You said "tomorrow" yesterday.

The above comments or recommendations are SWAG. Use at your own risk.
John, W9DDD

On 4/10/2023 12:54 PM, 73131.3073 at compuserve.com wrote:
> Ken -
>
> Are the dual TDs LXDs? I had a 28 ASR with what appeared to be LXDs 
> however one of them was an LX - parallel output. This was a special 
> system for the Air Force I was told and the LX was supposed to feed a 
> computer. Also, the machine was all 100 wpm and there were no 60 wpm 
> gears for the TD arrangement.
>
> Tim Swarthout
> WA5QEG
>
>
>
> -----Original Message-----
> From: ken Schwieker <ksweek at mindspring.com>
> To: GreenKeys at mailman.qth.net
> Sent: Sat, Apr 8, 2023 4:02 pm
> Subject: [GreenKeys] asr dual TDs
>
> I am watching this subject with interest as I have a 28asr that had a
> spider web of non original loose wires inside that I removed. The
> original wiring to the
> terminal strips is in good shape. This asr has what looks to be
> factory dual TDs. I am thinking I will series them but do not know how
> the original wiring was connected but maybe someone here can enlighten me.
> Ken S
>
>
>
> At 01:39 PM 4/8/2023, you wrote:
> As Eugene says, all the connections are on the terminal strips
> connected so you can do whatever you want. But standard usage for all
> the Navy M28 KSRs and ASRs that I have seen so far have a single loop
> connection with keyboard and printer in series (also TD in the ASR).
> Maybe because you wanted to also print what you were sending? But
> what do I know.....
> nota bene - the 28ASR K-KT-T switch would let you cut a tape locally
> while printing from elsewhere.
>
> Nick England K4NYW
>
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