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)
_______________________________________________
linux-dvb mailing list
linux-dvb@linuxtv.org
http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb
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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=200803211936.06052.zzam@gentoo.org \
--to=zzam@gentoo.org \
--cc=linux-dvb@linuxtv.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.