[GreenKeys] Model 28

[til128 at juno.com]

If you want to trace the cord on a 28 the recv. is on 5+ and 10- on the TB and xmit is 7+ and 8-.

Tom



---------- Original Message ----------
From: "John, W9DDD via GreenKeys" <greenkeys at mailman.qth.net>
To: greenkeys at mailman.qth.net
Subject: Re: [GreenKeys] Model 28
Date: Tue, 2 Jun 2026 16:15:19 -0500

Don't ever recall seeing anything that defines which is which.

The RX lead would measure around 100-200 ohms.  TX lead would be a 
short, and if you have break key, pushing it would give you an open 
circuit.  That being said, there are many different configurations 
depending Bell System, Navy, or private line usage.  You might have to 
lift the hood.


On 6/2/2026 2:32 PM, Gavin Wuchter via GreenKeys wrote:
> hello!
> Quick question, I have a teletype model 28 with 2 chords coming out of 
> it, one is red one is black, my question is which one is the keyboard 
> and which one is the magnet, thank you!
>
> -Gavin Wuchter
>
>
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-- 
---
----
The above comments or recommendations are SWAG. Use at your own risk.

John, W9DDD

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>>> Jordan Spencer Cunningham's GreenKeys Search Tool: https://teletype.net/gksearch
>>> 2002-to-present greenkeys archive: http://mailman.qth.net/pipermail/greenkeys/
>>> 1998-to-2001 greenkeys archive: http://mailman.qth.net/archive/greenkeys/greenkeys.html
>>> Randy Guttery's 2001-to-2009 GreenKeys Search Tool: http://comcents.com/tty/greenkeyssearch.html

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