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

[Pete Lancashire]

your doing it all wrong

ITTY -> Sound card output -> HP 3325A (*) -> leaky coax -> SP600 or
R390 -> Dovetron -> TTY
(*) or 8660C/D during the winter.

Not yet tested ...

-pete

On Fri, Dec 31, 2010 at 4:40 PM,  <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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