[GreenKeys] Hello and Where to find PC to RTTY Interface?

Mon Jan 3 15:31:15 EST 2011

Hi, folks - 

Due to lots of interest I've ordered boards and parts for an initial run of
20 units. Total cost for each unit will be $32 including the PC  board, all the
components, and shipping (unless you live somewhere exotic or require special
shipping)  This is all at cost - i'm not looking to make any profit here. :) 

The schematic, layout, documentation, and partslist are at 
http://xymoc.com/~eric/rttydemod

It's looking possible that there may need to be a second run. 

I'll send an update when the boards are in and try to confirm who wants
how many, etc... 

eric

On Sat, Jan 01, 2011 at 12:26:54PM -0800, epvgk at limpoc.com wrote:
> Hi, 
> 
> Enough people have expressed interest that I'm going to do a small run of 
> about 20 boards with a manufacturer I've used for work stuff in the past. 
> It's about a two week turnaround, but super cheap. the bare boards will be
> about $5, and will have solder mask and silkscreen with part markings. I'll 
> also preorder all the cheap passive components so people don't have to order 
> minimum quantities just to get one resistor, etc.. It's a small enough 
> outlay that I don't really care if I end up with a pile of them unclaimed, as
> I can always use more loose parts anyway. More info once the partslist is
> all checked and verified. 
> 
> eric
> 
> 
> 
> 
> 
> 
> On Fri, Dec 31, 2010 at 04:40:30PM -0800, epvgk at limpoc.com wrote:
> > 
> > Hi folks - 
> > 
> > A bunch of people have expressed interest in the FSK demodulator I made, one
> > of which I gave to Paul Cembura. It's just a straightforward application of 
> > the NJM2211 AFSK decoder chip pretty much right out of the datasheet, with an 
> > optical current loop interface tacked on. 
> > 
> > Basically you give it power and an audio signal (ie from a computer playing 
> > ITTY) and it keys a current loop circuit with the decoded data stream,
> > suitable for directly driving an actual teletype machine. It does not include
> > a loop power supply, as it's basically just an optical relay that opens and
> > closes. It's also receive-only - it doesn't modulate. You can adjust the
> > center frequency somewhat, and select wide or narrow shift. 
> > 
> > Paul and I have been using them for a while and it works fine for decoding 
> > ITTY and various stuff I've found on the Ham bands, but is by no means a 
> > sophisticated device. It does have the advantages of being tiny (2 by 2.5 
> > inch board), cheap (<$20 in parts), and easy to assemble (30 components total). 
> > 
> > I'm including the schematic in PDF format, and the eagle files are at:
> > http://xymoc.com/~eric/rttydemod/
> > If anyone wants gerbers or some other format, let me know. 
> > 
> > I'm thinking of having a run of about 20 of the bare board manufactured, 
> > which would run about $5 each at cost - if more than one or two people want 
> > one I'll do this just to make it easy. I can also include with it a parts list 
> > with Digikey part numbers so it's easy to order everything. Unfortunately I 
> > am so busy with work these days I'm not going to realistically have time to 
> > do preassembled ones. 
> > 
> > Anyway, I feel sort of silly putting this out there since it's a bit sloppy
> > and not anything at all innovative, but i'm happy to contribute if people
> > want it... 
> > 
> > eric
> > 
> > On Thu, Dec 30, 2010 at 02:08:52PM -0800, Bill wrote:
> > > 
> > > 
> > > On 12/30/2010 10:37 AM, epvgk at limpoc.com wrote:
> > > >On Thu, Dec 30, 2010 at 08:23:02AM -0800, Greg Farrell wrote:
> > > >>Hi All,
> > > >>
> > > >>I am brand new to RTTY hardware and this group, first posting. Had a problem with my email address since I send from my native account, not k6sro at arrl.net and got a  message back I was not on the member list, but I am. Changed my email address to gregf at pon.net so hope this works.
> > > >>
> > > >>
> > > >>Picked up a model 15 from Paul http://www.johnwhitney.com/misc/paul-rtty.htm yesterday.
> > > >>
> > > >>Thank you Paul.
> > > >>
> > > >>He demonstrated that machine with a little interface box from his laptop running ITTY.
> > > >>
> > > >>Where can I get this box or does anyone have a schematic/parts list for one?  It had an email address on it something like eric at linpoc.com but that doesn't work.
> > > >>
> > > >>TNX in advance.
> > > >>
> > > >>
> > > >>Greg
> > > >>K6SRO
> > > 
> > >     I would be very interested in this also.
> > > Thanks
> > > Bill Cain
> > > >hi, that's me :)
> > > >i can give you schematics and parts lists for that little box if you like, and if you have
> > > >patience could etch you a bare pc board for it. you'd be on your own assembling it but it's
> > > >a very simple circuit.
> > > >
> > > >eric at limpoc.com
> > > >
> > > >
> > > >>-.- -.... ... .-. ---
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