From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mail-out.m-online.net ([212.18.0.9]) by www.linuxtv.org with esmtp (Exim 4.63) (envelope-from ) id 1Jcm6k-0003NX-O2 for linux-dvb@linuxtv.org; Fri, 21 Mar 2008 19:36:53 +0100 Received: from mail01.m-online.net (mail.m-online.net [192.168.3.149]) by mail-out.m-online.net (Postfix) with ESMTP id EF37022715B for ; Fri, 21 Mar 2008 19:36:18 +0100 (CET) Received: from localhost (unknown [192.168.1.157]) by mail.m-online.net (Postfix) with ESMTP id 2D48C90092 for ; Fri, 21 Mar 2008 19:36:08 +0100 (CET) Received: from mail.mnet-online.de ([192.168.3.149]) by localhost (scanner1.m-online.net [192.168.1.157]) (amavisd-new, port 10024) with ESMTP id 34b3n+MKGN5B for ; Fri, 21 Mar 2008 19:36:07 +0100 (CET) Received: from gauss.x.fun (ppp-88-217-123-54.dynamic.mnet-online.de [88.217.123.54]) by mail.nefkom.net (Postfix) with ESMTP for ; Fri, 21 Mar 2008 19:36:07 +0100 (CET) Received: from localhost (localhost [127.0.0.1]) by gauss.x.fun (Postfix) with ESMTP id DFCD41D538B for ; Fri, 21 Mar 2008 19:36:06 +0100 (CET) From: Matthias Schwarzott To: linux-dvb@linuxtv.org Date: Fri, 21 Mar 2008 19:36:05 +0100 References: <47E2D3C4.2050005@gmail.com> <200803211015.54663@orion.escape-edv.de> In-Reply-To: <200803211015.54663@orion.escape-edv.de> MIME-Version: 1.0 Content-Disposition: inline Message-Id: <200803211936.06052.zzam@gentoo.org> Subject: Re: [linux-dvb] TDA10086 fails? DiSEqC bad? TT S-1401 Horizontal transponder fails List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Sender: linux-dvb-bounces@linuxtv.org Errors-To: linux-dvb-bounces+mchehab=infradead.org@linuxtv.org List-ID: On Freitag, 21. M=E4rz 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 =3D (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 =3D (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 the= n. Regards Matthias -- = Matthias Schwarzott (zzam) _______________________________________________ linux-dvb mailing list linux-dvb@linuxtv.org http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb