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 1JNx22-0002Hq-DG for linux-dvb@linuxtv.org; Sat, 09 Feb 2008 22:14:42 +0100 From: Matthias Schwarzott To: Eduard Huguet Date: Sat, 9 Feb 2008 22:14:06 +0100 References: <47ADC81B.4050203@gmail.com> In-Reply-To: <47ADC81B.4050203@gmail.com> MIME-Version: 1.0 Content-Disposition: inline Message-Id: <200802092214.06946.zzam@gentoo.org> Cc: linux-dvb@linuxtv.org Subject: Re: [linux-dvb] Some tests on Avermedia A700 List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: linux-dvb-bounces@linuxtv.org Errors-To: linux-dvb-bounces@linuxtv.org List-ID: On Samstag, 9. Februar 2008, Eduard Huguet wrote: > Hi, Matthias Hi Eduard! > I've been performing some tests using your patch for this card. > Right now neither dvbscan nor kaffeine are able to find any channel on > Astra (the sat. my dish points to). > > However, Kaffeine has been giving me some interesting results: with your > driver "as is" it's getting me a 13-14% signal level and ~52% SNR when > scanning. Then, thinking that the problem is related to the low signal I > have I've changed the gain levels used to program the tuner: you were > using default values of 0 for all (in zl1003x_set_gain_params() > function, variables "rfg", "ba" and "bg"), and I've changed them top the > maximum (according to the documentation: rfg=1, ba=bg=3). With that, I'm > getting a 18% signal level, which is higher but still too low apparently > to get a lock. > > I've stopped here, because I really don't have the necessary background > to keep tweaking the driver. I just wanted to share it with you, as > maybe you have some idea on how to continue or what else could be done. > So I can do only this guess: I changed demod driver to invert the Polarization voltage for a700 card. This is controlled by member-variable voltage_inverted. static struct mt312_config avertv_a700_mt312 = { .demod_address = 0x0e, .voltage_inverted = 1, }; Can you try to comment the voltage_inverted line here (saa7134-dvb.c: line 865). BUT: If this helps we need to find out how to detect which card needs this enabled/disabled. Regards Matthias -- Matthias Schwarzott (zzam) _______________________________________________ linux-dvb mailing list linux-dvb@linuxtv.org http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb