[Ronja] Channel Capacity

[Karel Kulhavy]

On Sun, Oct 21, 2007 at 05:24:00PM +0200, Jakub Ladman wrote:
> Dne Friday 19 October 2007 19:32:37 Karel Kulhavy napsal(a):
> > On Fri, Oct 19, 2007 at 10:38:56AM +0200, Daniel Polak wrote:
> > > Whats the theoretical channel capacity from Ronja Tetrapolis calculated
> > > with the shannon-hartley theorem? I tried to calculate it but I'm not
> > > sure about the bandwidth. What's the bandwidth in hertz?
> >
> > I don't know. What I know for sure it's constantly changing with clouds
> > passing over the landscape, fog, day/night etc. The bandwidth is about
> > 100nm which is 77,000 GHz.
> 
> Bandwidth of ronja circuits 77GHz? This is absolute nonsense.
> I have not calculated it, but i estimate it about 50MHz

The transmission bandwidth is like this due to spectral width of the LED diode.
It's an electromagnetic signal at 480,000 GHz, 77,000 GHz wide ;-) Then it is
demodulated like envelope detected on the photodiode. The electronics bandwidth
is aimed at 16MHz.

But I don't know if Shannon theorem takes quantum effects into the account.  On
this frequency they are already strong.

CL<

> 
> Jakub Ladman
> 
> >
> > CL<
> >
> > > --
> > > GMX FreeMail: 1 GB Postfach, 5 E-Mail-Adressen, 10 Free SMS.
> > > Alle Infos und kostenlose Anmeldung: http://www.gmx.net/de/go/freemail
> > >
> > > --
> > > Twibright Ronja mailing list http://ronja.twibright.com
> > > Ronja at lists.pointless.net
> > > http://pointless.net/mailman/listinfo/ronja
> 
> 
> 
> -- 
> Twibright Ronja mailing list http://ronja.twibright.com
> Ronja at lists.pointless.net
> http://pointless.net/mailman/listinfo/ronja