[GreenKeys] Identify that ESU

[Charles Ring]

Henry Minsky wrote:

> 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?

This ESU is very similar but not identical to the Western Union ESU in my 28ASR

73 de W3NU