From: Matthias Schwarzott <zzam@gentoo.org>
To: linux-dvb@linuxtv.org
Subject: Re: [linux-dvb] TDA10086 fails? DiSEqC bad? TT S-1401 Horizontal transponder fails
Date: Fri, 21 Mar 2008 19:36:05 +0100 [thread overview]
Message-ID: <200803211936.06052.zzam@gentoo.org> (raw)
In-Reply-To: <200803211015.54663@orion.escape-edv.de>
On Freitag, 21. März 2008, Oliver Endriss wrote:
> Hi,
>
> Manu Abraham wrote:
> > Hi Hartmut,
> >
> > Hartmut Hackmann wrote:
> > > This might be right! I could not get good information regarding the
> > > transponder bandwidths. We might need to make this depend on the
> > > symbol rate or a module parameter.
> >
> > You can calculate the tuner bandwidth from the transponder symbol rate
> > (in Mbaud) for DVB-S:
> >
> > BW = (1 + RO) * SR/2 + 5) * 1.3
>
> Apparently I need some lessons in signal theory. ;-)
> What does R0 stand for?
>
> Do we have to select a higher cut-off value to compensate for the LNB
> drift and other stuff like that?
>
Zarlink zl1003x datasheet (avail on net) tells this:
fbw = (alpha * symbol rate) / (2.0 * 0.8) + foffset
where alpha is roll-off 1.35 for dvb-s and 1.20 for DSS
The manual suggests to use highest possible bandwidth for aquiring a lock.
And after that read back the offset from the demod and adjust the tuner then.
Regards
Matthias
--
Matthias Schwarzott (zzam)
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next prev parent reply other threads:[~2008-03-21 18:36 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-03-14 13:29 [linux-dvb] (no subject) ldvb
2008-03-14 13:33 ` Vladimir Prudnikov
2008-03-14 14:39 ` ldvb
2008-03-14 15:17 ` Vladimir Prudnikov
2008-03-14 15:24 ` [linux-dvb] TT budget S-1401 Horizontal transponder fails ldvb
2008-03-17 10:20 ` [linux-dvb] TDA10086 fails? DiSEqC bad? TT " ldvb
2008-03-18 17:38 ` [linux-dvb] TT-budget S-1401 issues. " ldvb
2008-03-20 0:18 ` [linux-dvb] TDA10086 fails? DiSEqC bad? TT S-1401 " Oliver Endriss
2008-03-20 16:33 ` ldvb
2008-03-20 20:55 ` Hartmut Hackmann
2008-03-20 21:14 ` Manu Abraham
2008-03-20 21:57 ` Hartmut Hackmann
2008-03-21 9:15 ` Oliver Endriss
2008-03-21 15:43 ` Manu Abraham
2008-03-21 16:55 ` Manu Abraham
2008-03-22 6:11 ` Oliver Endriss
2008-03-22 17:12 ` Manu Abraham
2008-04-10 20:40 ` Oliver Endriss
2008-04-10 23:33 ` hermann pitton
2008-04-11 21:29 ` Oliver Endriss
2008-04-11 23:35 ` hermann pitton
2008-04-11 21:12 ` Hartmut Hackmann
2008-04-11 21:36 ` Oliver Endriss
2008-03-21 18:36 ` Matthias Schwarzott [this message]
2008-03-21 20:00 ` Manu Abraham
2008-03-21 20:15 ` Matthias Schwarzott
2008-03-21 20:47 ` Manu Abraham
2008-03-21 23:25 ` Matthias Schwarzott
2008-03-22 1:27 ` Manu Abraham
2008-03-21 10:44 ` ldvb
2008-03-21 8:56 ` Oliver Endriss
2008-03-21 10:56 ` ldvb
2008-03-21 14:25 ` ldvb
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