[GreenKeys] Big Bird Loop Interface

[Gregory W. Moore]

Gil, I would prefer an external unit, capable of both hi and lo level 
loop keying.  The baudot/ascii feature would be nice, as I could key my 
28 and my mite which can be set either way.
    I would also like the whole design in keeping with the "TEMPEST" 
feature of the Dovetron, since I am a former Navy RM (LOL) and have 
everything shielded.  That would, however be a matter of the enclosure 
and cables which, presumably, we all would fabricate. Full duplex is a 
good feature, but I haven't used this feature since I left the military. 
I still like to see what I type. a programming feature of either 
inserting the CR/LF or not, as one chooses is a great thing, and I, 
personally, would like an LED character counter (just a personal preference)
73 de Greg WA3IVX



Richard M. Gillingham wrote:

>Gonna push a '28 here, was going to do one of my own, but if y'all wanna do
>it.......  Sure, Why not..
>
>Gil, W1RG
>----- Original Message -----
>From: "gil smith" <gil@vauxelectronics.com>
>To: <greenkeys@mailman.qth.net>
>Sent: Saturday, February 22, 2003 3:55 PM
>Subject: Re: [GreenKeys] Big Bird Loop Interface
>
>
>  
>
>>Hey Big Bird group:
>>
>>Jack, George, and I have been mulling over a little circuit board to add
>>    
>>
>to
>  
>
>>the dovetrons for directly driving a current loop from the dovetron 232
>>output, and sensing loop data for sending to the dovetron tx section.
>>    
>>
>Jack
>  
>
>>already has a tempest dovetron he has been looking at.  Unless you are
>>planning to drive a 232 printer, or already have a 232-to-loop converter,
>>we presume you will want some way to drive your TTY machines.
>>
>>So how about a little poll?  I'd like some feedback as to what features
>>    
>>
>you
>  
>
>>folks might like in such a board:
>>
>>- do you care at all?  Or, do you already have a 232-to-loop adapter to
>>    
>>
>use?
>  
>
>>- do you want to drive a high-voltage loop (120-150V for M14/15/19/28...),
>>or a low-voltage loop (30-45V for M32...)?
>>
>>- how many tty loop jacks should be available?
>>
>>- would you mind drilling holes in your dovetron to add a board inside?
>>
>>- would you rather mount it externally in a box and connect to the
>>    
>>
>dovetron
>  
>
>>BNC connectors?
>>
>>- would you rather mount it externally in a box but connect to a DB-9
>>connector that you add to the dovetron?
>>
>>- do you plan to use half-duplex (single-loop rx/tx), or full-duplex (two
>>loops for rx and tx)?
>>
>>- would you want to add an optional chip or two for doing automatic speed
>>conversions and/or baudot/ascii conversions?  Then you would no longer
>>    
>>
>need
>  
>
>>to worry about machine gears -- demod to any speed machine.  I have
>>    
>>
>already
>  
>
>>done most of this code.  This can also automaically insert CR CR LF LTRS
>>    
>>
>at
>  
>
>>72 chars (or N chars), or add an LF after a CR that has none...  Tell me
>>what you want.
>>
>>
>>This interface will be similar to the TTY232 board I did before -- a fully
>>opto-isolated 232 to loop interface.  But, based on your feature feedback,
>>would likely be simpler, smaller and would have a soldermask and silk
>>screen this time.  I think I will offer bare-board only, or full parts
>>    
>>
>kit,
>  
>
>>to make it easier for folks to get started.
>>
>>thanks,
>>
>>gil
>>
>>
>>
>>;-----------------------------------------------------------
>>;  vaux electronics, inc.             480-354-5556
>>;  http://www.vauxelectronics.com     (fax: 480-354-5558)
>>;-----------------------------------------------------------
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>>
>
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