[GreenKeys] Model 19 on ITTY

[Virgil Bierschwale]

you can always add a rs232 board to the computer or use something like this

https://www.amazon.com/RS-232-Serial-Adapter-Windows-64bit/dp/B004WL7MIQ


On Fri, Jan 24, 2020 at 9:38 AM Duncan Brown <duncanancy at earthlink.net>
wrote:

> AL,
>
> Are XR-2211 chips still available?  They make a very simple AFSK
> decoder. It is a 14 pin DIP IC and with a few Rs & Cs will give you an
> AFSK decoder. (you don't need any limiter or selectivity coming off
> ITTY) Then just add an optocoupler to interface with the TTY loop.
>
> If you you manage to get MMTTY to  output to a serial port, don't worry
> about ASCII  conversion. MMTTY will output in 5-bit.
>
> For a serial port, look for an old Win 7 or XP laptop.
>
> Good luck,
>
> Duncan
> K2OEQ
>
>
> On 1/24/2020 09:56, Al Klase wrote:
> > Hi Ralph, /et al/
> >
> > The point is we don't have a TU.  We'll be running a PC anyway if we
> > monitor ITTY.  Logic level to current loop isn't a problem, and I've
> > found an Arduino "sketch" that will go from ASCII to baudot.
> >
> > I'm exploring RTTYT which looks like it will handle the PC chore.  The
> > scheme is complicated by the fact that modern PC's don't have RS-232
> > ports, and the UART's in the USB dongles don't support 5-bit formats.
> >
> > 73,
> > Al
> >
> > On 1/23/2020 5:00 PM, Ralph Mowery wrote:
> >>
> >> Doesn’t the audio come out of your computer speakers ?   If so you
> >> could just run that audio into any modem/TU and then to the machine.
> >> I think that is what I did a year or so back.
> >>
> >> Ralph ku4pt
> >>
> >> *From:*greenkeys-bounces at mailman.qth.net
> >> [mailto:greenkeys-bounces at mailman.qth.net] *On Behalf Of *Al Klase
> >> *Sent:* Thursday, January 23, 2020 4:40 PM
> >> *To:* greenkeys at mailman.qth.net
> >> *Subject:* [GreenKeys] Model 19 on ITTY
> >>
> >> Gang,
> >>
> >> We're still klutzing around with TTY's at the Radio Technology
> >> Museum, and we're starting to make some progress.  So, how do we get
> >> data from ITTY out to the machine?
> >>
> >> I have MMTTY copying the stream FB, but don't see the hooks to get
> >> the data out.  Even 8-bit ASCII on a COM Port would be OK, as we can
> >> use TinyFSK on an Arduino to get to Baudot.
> >>
> >> I may just be dense. :-(
> >>
> >> Al
> >>
> >
> > --
> > Al Klase – N3FRQ
> > Jersey City, NJ
> > http://www.skywaves.ar88.net/
> >
> >
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