[GreenKeys] Newbie setting up an m26

[Jomar Quilatan]

Thank you for these, Tom!  Helps me confirm that I indeed had the right
reference documentation sourced somewhere I can't seem to remember at
present.

Regards,

Jomar

On Mon, Feb 5, 2024 at 1:12 PM til128 at juno.com <til128 at juno.com> wrote:

> Oh! I forgot to include the BSP for the 26 which can be found here:
>
> https://www.navy-radio.com/manuals/tty/ab84.141.pdf
>
> Tom
>
> ---------- Original Message ----------
> From: Jomar Quilatan <jomarquilatan at gmail.com>
> To: greenkeys at mailman.qth.net
> Subject: [GreenKeys] Newbie setting up an m26
> Date: Mon, 5 Feb 2024 12:29:24 -0500
>
> Greetings!
>
> New list subscriber here - and a starting teletype user also. I got my
> hands on an M26 not long ago in the hopes of getting it to work. Though the
> keyboard area exhibited typical storage dust, the interior looked
> surprisingly clean for something likely to have sat for 50+ years unused.
>
> Anyways - I’ve read up that a loop current would be necessary to govern
> the selector magnet and stop the “chattering” that the machine does when
> the wires aren’t connected. Also possibly the way I test if the message
> encoding/decoding works. Aside from the power cable, this has another with
> two wires coming out of it, which I suppose are hooked up to the loop.
>
>  I understand these also had a special table made for the unit to house
> the paper roll and some kind of circuit - which this unit sadly did not
> come with. A couple of questions as a result:
>
> 1) Assuming a 60mA basis, would this need to be a high voltage (120V)
> solution or can a lower value work just fine? I’ve heard the that the
> magnet resistance is no more than 120 ohms, but I’ve seen some people
> supply a 120V 60mA source likely to the loop. Just assessing the power
> supply and other equipment I need to get that might exceed the ratings of
> the components of my Arduino kit.
>
> 2) On top of that, any newbie-oriented suggestions for testing out /
> running diagnostics on the 26? I don’t mind wiring but have limited bench
> tools and no solder (yet).
>
> Regards,
>
> Jomar Quilatan
>
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