[GreenKeys] Newbie setting up an m26

[til128 at juno.com]

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&rsquo;ve read up that a loop current would be necessary to govern the selector magnet and stop the &ldquo;chattering&rdquo; that the machine does when the wires aren&rsquo;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&rsquo;ve heard the that the magnet resistance is no more than 120 ohms, but I&rsquo;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&rsquo;t mind wiring but have limited bench tools and no solder (yet). Regards, Jomar Quilatan
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.qth.net/pipermail/greenkeys/attachments/20240205/22a5e7ab/attachment.html>