-----Original Message----- From: Antti Palosaari [mailto:crope@xxxxxx] Sent: Tuesday, 3 February 2009 07:25 To: linux-media@xxxxxxxxxxxxxxx Cc: linux-dvb@xxxxxxxxxxx; Andrew Williams Subject: Re: KWorld PlusTV Dual DVB-T Stick (DVB-T 399U) / AF9015 - Dual tuner enabled by default =Bad signal reception Hello Andrew, Andrew Williams wrote: > In the past I have had problems with reception for the AF9015 if both > tuners were enabled. > It was disabled by default or I could manually enable dual tuners with > dvb-usb-af9015 dual_mode=1 (modprobe.d/options) > > If both tuners were enabled there was a lot of signal degradation, > however, with only 1 tuner enabled the quality was VERY good. Yes, it really looks like there is some sensitivity drop when both tuners are enabled. However in my understanding tuner #1 in dual mode have almost same performance than tuner #0 in single mode. Also current MXL5005S tuner driver has not best performance... Could you test if that tuner driver performs any better for you: http://linuxtv.org/hg/~anttip/af9015-mxl500x/ > I have just downloaded the latest drivers and it seems that both tuners > are enabled by default and there is no parameter that I can find to > disable the second tuner. > Now I am back to where I was before with bad signal degradation but no > way to disable the second tuner. Yes, I removed whole parameter. If there will be much negative feedback then I should consider add that parameter back - but probably dual mode enabled by default. > With drivers dated 22 Dec 2008 the second tuner was still disabled by > default. Also the driver from 22 December 2008 lit an LED on the Tuner > to indicate that the firmware was loaded/stick was initialised. > Something that I did not have before (the LED). > > Now with the latest driver, the LED does not function anymore but more > importantly, both tuners are enabled by default. hmm, haven't changed LED controls. I should look that later. > Is there any way that I can disable the second tuner without having to > revert to the old drivers? Not currently. I will wait some feedback and make decision about that. Thank you for feedback. regards Antti -- http://palosaari.fi/ Thanks Antti, Thanks for your reply and suggestions. I will reload the current latest driver and switch to Tuner 1 and test. I will also install the suggested driver http://linuxtv.org/hg/~anttip/af9015-mxl500x/ After testing I will get back to you. Current dual tuner Signal degradation is uniform over all channels - SBS/CH10/CH9/CH7/ABC here in Oz Unit is powered from a signal amplifier with a 20db variable attenuator (for testing so that I do not overdrive DVB). Reception Quality is compared with a DVICO Dual Digital 4 (rev 2) on the same splitter whenever I encounter a problem. I have noticed that the DVICO does not exhibit the same problems on the same machine as the AF9015. Don't get me wrong, I would love to have both tuners working well on the AF9015. As for the me not being able to disable the second tuner: Played with af9015.c and compared it to previous version that Had the function dvb_usb_af9015_dual_mode and parsed 6 lines back in into the 10day old driver. I added the following back into af9015.c in the right places, so no need to bother you with that if I still need it after the testing above: static int dvb_usb_af9015_dual_mode; module_param_named(dual_mode, dvb_usb_af9015_dual_mode, int, 0644); MODULE_PARM_DESC(dual_mode, "enable dual mode"); /* disable dual mode by default because it is buggy */ if (!dvb_usb_af9015_dual_mode) af9015_config.dual_mode = 0; Compiled. I can now disable the second tuner if I need in future. Unfortunately I am not a programmer so these things took me a while. No need for you to worry about that as I can solve dvb_usb_af9015_dual_mode myself in future, thanks very much for your clearly marked code. Any chance to stop a remote being detected for my af9015? It has no IR sensor or remote - KWorld PlusTV Dual DVB-T Stick The drivers detect a remote. I can't see one on the unit. Is it ok to leave it as is or is it better to disable (and how do I do that) remote detection on the DVB? Thanks for all your hard work. Regards Andrew _______________________________________________ linux-dvb users mailing list For V4L/DVB development, please use instead linux-media@xxxxxxxxxxxxxxx linux-dvb@xxxxxxxxxxx http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb
