From: sekv.vsanrbnfsv@hbone.hu
Date: Wed Jul 04 2001 - 11:52:48 EEST
Did someone know how to modified baycom.c to works 2400 bps in kernel
2.0.XX??
Thank you
Kevin Dawson writes:
> > > The TCM3105 has a variety of modes, selected by various connections of 3 pins
> > > (TXR1, TXR2 and TRS - sorry, I don't have the data handy to say how).
> > > Standard 200Hz shift modes like V.21 and Bell 103 are available.
> >
> > According to the datasheet I have it doesn't have any of the above. But it
> > does have a 400Hz shift V.23 mode that probably can be used by scaling the
> > xtal.
>
> OK, without looking I couldn't say - it's been a few years.
> Put it down to my unrefreshed dynamic memory having parity errors :-)
>
> > > Another method would be to use one of the converters that SSTV uses -
> > > the type that filters a square wave from the ttyS and squares up
> > > the received signal back to it.
> > > The computer does the FM part.
> > > I don't know if anyone has ever written a packet driver for that,
> > > but a good place to look would be in SSTV software.
> >
> > You mean a HamCom type of interface? There are packet radio drivers for it
> > but not on Linux (I'd guess the interrupt load would be too high (?)).
>
> Yes.
> Regarding interrupts, if you used low audio frequencies
> like (say) 500 and 700Hz, that will bring the interrupt rate down.
> 1000/1400 interrupts per second might be manageable.
> It is a compromise between that, the audio response of the radio
> and the transient response of the HamCom filters.
>
> Kevin
>
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