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Re: [Tlf-devel] fldigi & tlf


From: Wilbert Knol
Subject: Re: [Tlf-devel] fldigi & tlf
Date: Fri, 23 Nov 2007 01:45:56 +0100
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> There has been an interesting discussion on the Yahoo group LinuxHam,

Just had a look - tnx.

> The consensus is that even an RT Linux kernel has limitations due to
> timing and that QRQ operation isn't feasable.

> How well this is being 
> accomplished on the Win programs, I don't know.

I don't have a scope handy, but I guess at a typical contest speed of 32 WPM, 
dots may be 10 ms or so. Allowing for + or - 10% jitter, it could be a bit 
too demanding for the kernel, and no doubt it is the same for any of the 
Windows strains

Hence the hardware implementation (W1EL winkeyer) which may also be the best 
approach for Linux. It echos back to the PC any characters sent and that 
would allow real-time editing of the CW buffer.

I see Rein has a linux driver on his todo list. It would be fun to knock out 
an open source version of the keyer hardware, which can't be that difficult. 
I have an AVR prototyping board kicking around, and Debian comes with AVR 
assemblers and loaders.


Wilbert, ZL2BSJ




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