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Re: [Tlf-devel] MMTTY plugin for TLF?

From: Thomas Beierlein
Subject: Re: [Tlf-devel] MMTTY plugin for TLF?
Date: Mon, 10 Oct 2011 09:27:59 +0200

Am Mon, 10 Oct 2011 02:21:15 +0000 (GMT)
schrieb address@hidden:

> On Oct 9, 2011, Martin Kratoska <address@hidden> wrote: 
> >BTW a true FSK is a must for RTTY, AFSK or several pseudoFSK options
> >are rather annoying. The same was with Windoze until JE3HHT created
> >MMTTY. My suggestion is to search for a keen programmer who will be 
> >able/willing to solve the FSK timing issues and create a true FSK 
> >program for Linux.

One field to look into is a realtime linux system. But I do not know if
that is enough.

> I am absolutely NOT that keen programmer(grin)...
> I wonder, might the answer be some kind of external hardware device?
> I'm thinking "Winkey for FSK", possibly implemented on Arduino
> hardware. 

Sure that is one possible solution.

One drawback of most existing external devices is that they miss some
kind of feedback about progress in sending. With that the idea sounds

> Actually, wouldn't that be fairly simple, since the
> external device doesn't have to worry about receiving?  (that can be
> done in DSP on the Linux host)  You'd just feed ASCII characters to
> the external hardware over a RS-232 or USB port; the hardware (OK,
> firmware) would map to Baudot & shift a digital output port up & down
> with appropriate timing.
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"Do what is needful!"
Ursula LeGuin: Earthsea

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