[GreenKeys] Big Bird Loop Interface

[Richard M. Gillingham]

Y'know Gil, I answered so quickly I didn't look at all the variables you
requested...

Some depends on the actual condition of the unit as received.  If it's in
good to excellent condition, then punching holes here and there might be
troublesome, but if the exterior is alread well worn, then what's a nother
ding or two.

In case 1 (good to excellent) (doubtful) then outboard components would
probably be welcome.  If otherwise, then let 'er rip.

A pcb alone is a great start, and then the grateful recipients could
fabricate to their hearts content.

Thanks in advance for the help.

(another) 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
>
>
>
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