[GreenKeys] TTY-Connect boards/micros

[gil smith]

Hi Eugene:

TTY232 and TTY232-TAP were projects from a few years ago -- about 25 folks 
got these boards.  TTY-Connect is the second-generation.


>1. tty232 is a loop supply and rs232 interface. Without the micro 
>installed, one needs to send baudot codes of the right number of bits down 
>the rs232 line using software (assuming a baudot printer,etc) likewise 
>when a keyboard or td is used, again, software must convert from baudot.

Yes, so it was used with heavymetal and rttyart, which send baudot.


>2. the tty232-tap is just the rs232 interface and keying/sensing circuit, 
>but no loop supply and no baudot-ascii conversion capabilities at all, but 
>be handled in software only.

It was a tiny gizmo to "tap" into an externally-powered loop.  Nobody cared.


>3. tty-connect - seems very similar to tty232 but perhaps more 
>sophisticated with an additional HV loop?

Yes, I refined the design, added a second HV loop, and added a second 232 
port for a TU like the tempest dovetrons many folks have.


>I have two needs, one is for this ticker project I discussed, but I would 
>also like to get a model 28 at some point and get it on the air.  For 
>regular, simple rtty use, how would i choose between the tty232 and 
>tty-connect? Does one supercede the other? Or does it depend on my needs?

TTY232 is no longer available, but the info is still online.


>Is there any option to get one of these prebuilt? I know there are some 
>secetions that I would need to decide what I needed, but if I chose the 
>sections, is there a way to receive it built?  If not, perhaps you know of 
>a greenkeyer who could build it for me?

I don't currently have time for building boards (I barely have time to get 
the docs finished), but you could ask on the list.


>For my ticker project, I am not sure how I could create a neutral to polar 
>converter.  Do you have any ideas/schematics?...Do you think I could take 
>either the tty232 or tty-connect and modify it? Or do you think an 
>external  converter would be a better idea?  Perhaps I should be thinking 
>of using the tty232-tap with an external supply that could some how go 
>polar or something..Or, do you think using a micro in one of your boards 
>could solve my problem with some programming?
>
>I was chatting with Jack Hart who is working on the ticker, and he thought 
>a polar option would be useful for machines like the 32ASR (I have no idea!)

You may have the only polar machine out there.  I'm not quite sure what is 
involved to drive it.  There are "polar relays," but I am not sure how they 
connect to equipment.  Jim Haynes thought the loops used +/- 30 mA (not 
60).  I don't know much about polar loops at all.  I tried to post a 
message (about ten different ways) to greenkeys about polar loops, and it 
was rejected as spam -- you were CC'd on it -- did you ever see it?  I 
should try posting it again.

But you should see if your machine wiring can be configured for neutral 
operation.  It may be easy to do.  After the polar input (relay?), it 
simply drives a selector magnet, I presume.

gil


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