[GreenKeys] ok here is my RO 28 I am shoving keyboard into to go over on display at the

[Nick England]

I think the WU 28 ESU wiring diagram is in the WU installation docs that I got from Russ and scanned. Look here in the list of misc docs near the top of the page. 
http://www.navy-radio.com/manuals-ttycorp.htm
Cheers
Nick
(phone email acct)


On Feb 18, 2013, at 10:39 PM, Jim Haynes <jhhaynes at earthlink.net> wrote:

> That one has a Western Union LESU instead of one by Teletype.  I once
> traced out the wiring of that thing, but I don't know where I put the
> diagram after I did it.
> 
> Teletype bought a lot of relays from Automatic Electric - the company was
> not required to use the parent company's relays and other products.  It
> was often easier to use products from other companies, because some
> Western Electric items were only manufactured when they were needed;
> and because the other companies were interested in selling their products
> on the open market, so they had sales organizations and catalogs that
> Western Electric lacked.
> 
> The polar relays you have there were designed by Western Union - see
> Western Union Technical Review for January 1952, p. 29.  They chose
> Automatic Electric to manufacture them, and A.E. was licensed to sell
> them on the open market as well.  Teletype apparently thought that
> relay was superior to the W.E. 255A, and it was certainly smaller.
> A.E. was persuaded to make the relays with a base that made them
> interchangeable with the 255A.  Later Western Electric came up with
> a replacement for the 255A that used a mercury-wetted contact
> assembly and was non-adjustable.
> 
> 
> jhhaynes at earthlink dot net
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