[GreenKeys] Heavy Metal ???

[epvgk at limpoc.com]

On Wed, Oct 20, 2010 at 03:59:30PM -0400, Larry Tighe wrote:
> Howdy Folks,
> 
> My son is loading Heavy Metal into a computer to be used just the that and Real Player ITTY.  I want to use the "Metal" for the 100 WPM to the Model 35.
> 
> Can someone send me the "address" for the Heavy Metal teletype signal?  Any ideas or suggestions are appreciated.
> 
> Lar
> K2JIA

I think those are "incompatible" uses, by which i mean that heavymetal won't
help you decode ITTY and feed it to a teletype machine. heavymetal will gather
news, etc.. from the internet and print it on the real hardware; to use ITTY
you need an AFSK demodulator as provided by other software packages like MMTTY
or FLdigi, or many others. Those, packages, however, won't feed the data to
a real teletype machine, but rather just display it on the screen. 

To decode ITTY onto a real machine, you need a plain old hardware demodulator,
or a computer with a current-loop interface running a software demodulator. 

I've designed and built a very small circuit board that serves this purpose,
using the NJM2211 FSK-demodulator chip - the board takes an audio input as from
the headphone jack of a computer, and has a current-loop interface which can
be connected directly to a teletype receiver loop (with a suitable loop current
supply). If you're interested I'm happy to supply the eagle layout and 
schematic for the board but you'd need to source the parts and connectors 
yourself. 

eric