From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from racoon.tvdr.de ([188.40.50.18]:56318 "EHLO racoon.tvdr.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755149Ab3D0PTE (ORCPT ); Sat, 27 Apr 2013 11:19:04 -0400 Received: from dolphin.tvdr.de (dolphin.tvdr.de [192.168.100.2]) by racoon.tvdr.de (8.14.5/8.14.5) with ESMTP id r3REpV8A003949 for ; Sat, 27 Apr 2013 16:51:32 +0200 Received: from [192.168.100.11] (falcon.tvdr.de [192.168.100.11]) by dolphin.tvdr.de (8.14.4/8.14.4) with ESMTP id r3REpQxv028458 for ; Sat, 27 Apr 2013 16:51:26 +0200 Message-ID: <517BE5EE.6050004@tvdr.de> Date: Sat, 27 Apr 2013 16:51:26 +0200 From: Klaus Schmidinger MIME-Version: 1.0 To: linux-media@vger.kernel.org Subject: Re: [linux-media] stb0899: no lock on dvb-s2 transponders in SCR environment References: <517BC11E.50105@gmx.de> In-Reply-To: <517BC11E.50105@gmx.de> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-media-owner@vger.kernel.org List-ID: On 27.04.2013 14:14, Reinhard Nissl wrote: > Hi, > > my stb0899 card works properly on dvb-s and dvb-s2 transponders when using a direct port on my sat multiswitch. > > When using a SCR port on that multiswitch and changing VDR's config files accordingly, it only locks on dvb-s transponders. > > A SCR converts the selected transponder's frequency after the LNB (IF1) to a fixed frequency (for example 1076 MHz) by mixing the signal with a local oscialator frequency above IF1 so that the lower sideband of the mixing product appears at 1076 MHz. > > The lower sideband's spectrum is mirrored compared to the upper sideband, which is identical to the original spectrum on the original IF1. > > Could that be the reason why the stb0899 cannot lock on dvb-s2 transponders in an SCR environment? > > Any ideas on how to get a lock on dvb-s2 transponders? Just wanted to let you know that I can confirm the problem with the stb0899. On my TT S2-6400 I can receive DVB-S and DVB-S2 just fine with SCR. During development of SCR support for VDR I guess I did all tests with the 6400, so I didn't come across this problem. However, as a reaction to your posting I explicitly tested it with my budget cards, and there I indeed can only tune to DVB-S transponders. No idea how to solve this, though... Klaus