[GreenKeys] Identify that ESU

[Don Robert House]

>http://www.beartronics.com:8088/tmp/tty/index.html
>
>
>These are some pictures of the ESU of a model 28 which I just 
>acquired, without
>any documentation.
>It looks similar to the one that Charles Ring posted a few days ago.
>
>Can anyone tell me some information about what this thing does? What are
>the phone plugs for on the box on the left, and those four screws 
>that appear to be
>pots labeled PP, BP, RP, TKP ?  And what are those "jones" plugs for?
>
>Just curious ... I am planning to bypass pretty much all that stuff 
>and just wire the current
>loop directly to the typing unit and keyboard. But if I can use the 
>power supply to generate the
>loop current that might be nice.
>
>
>Also -- the type case that came with it looks kind of funny - can 
>anyone tell me what
>those symbols are for?
>
>Thanks,
>         Henry


Henry,

That is a weather typebox.  I would be happy to trade a standard 
typebox for the weather one.

Your ESU is a custom job designed by Western Union.  I do not know 
what the jacks are for but Jim Haynes might know.

Don

-- 
--------------------------------------------------------
Don Robert House, N.S.E.
Curator, NADCOMM
North American Data Communications Museum
3841 Reche Road
Fallbrook, CA 92028-3810
760-723-9943 Office
760-723-9984 FAX
URL: http://www.nadcomm.org
e-mail: drhouse@abac.com