Re: [progress]: dvb_usb_rtl28xxu not tuning "Leadtek Winfast DTV2000 DS PLUS TV"
On 26/09/17 22:45, Vincent McIntyre wrote: On Tue, Sep 26, 2017 at 02:32:26PM +1000, Eyal Lebedinsky wrote: While the problem persists, I managed to find a way around it for now. I changed the antenna input. Originally I used a powered splitter to feed all the tuners, and it worked well with the out-of-kernel driver. This driver does not build or work with a more modern kernel so I shifted to using dvb_usb_rtl28xxu which fails to tune. The new wiring splits (passive) the antenna in two, feeds one side directly to the two "Leadtek Winfast DTV2000 DS PLUS TV" cards (through another passive 2-way) and the other side goes to the old powered splitter that feeds a few USB tuners. Now all tuners are happy. It seems that the "Leadtek Winfast DTV2000 DS PLUS TV" cannot handle the amplified input while the USB tuners require it. I hope that there is a way to set a profile in dvb_usb_rtl28xxu to attenuate the input to an acceptable level thus unravelling the antenna cables rat-nest. Glad you had some success. I did some more rummaging in v4l-utils. It may help you to know about dvb-fe-tool, which gives information about the frontend device (eg /dev/dvb/adapter0/frontend0). In particular you can monitor the s/n as you make changes: # dvb-fe-tool --femon -a 0 #here doing adapter0/frontend0 It displays info about the signal quality and the carrier/noise (C/N) ratio, which might help any investigation of where the driver fails to cope as you change what you are feeding it. I noticed your dvbv5-scan showed C/N around 20dB but the manpage shows 'good signal' with C/N of 36dB which suggests the device should be expected to deal with higher signal levels. Once you figured out the signal level, did a dvbv5-scan work with no errors? In the example you showed I saw the channels getting 'lock' but then some kind of error occurred. I had very good reception and scandvb tuned to all channels. I did not test dvbv5-scan again but I expect it would work too (will try in the morning). Regards Vince -- Eyal Lebedinsky (e...@eyal.emu.id.au)
Re: [progress]: dvb_usb_rtl28xxu not tuning "Leadtek Winfast DTV2000 DS PLUS TV"
On Tue, Sep 26, 2017 at 02:32:26PM +1000, Eyal Lebedinsky wrote: > > While the problem persists, I managed to find a way around it for now. > > I changed the antenna input. > > Originally I used a powered splitter to feed all the tuners, and it worked > well with the out-of-kernel driver. This driver does not build or work with > a more modern kernel so I shifted to using dvb_usb_rtl28xxu which fails to > tune. > > The new wiring splits (passive) the antenna in two, feeds one side directly > to the two "Leadtek Winfast DTV2000 DS PLUS TV" cards (through another passive > 2-way) and the other side goes to the old powered splitter that feeds a few > USB tuners. > > Now all tuners are happy. It seems that the "Leadtek Winfast DTV2000 DS PLUS > TV" > cannot handle the amplified input while the USB tuners require it. > > I hope that there is a way to set a profile in dvb_usb_rtl28xxu to attenuate > the input to an acceptable level thus unravelling the antenna cables rat-nest. Glad you had some success. I did some more rummaging in v4l-utils. It may help you to know about dvb-fe-tool, which gives information about the frontend device (eg /dev/dvb/adapter0/frontend0). In particular you can monitor the s/n as you make changes: # dvb-fe-tool --femon -a 0 #here doing adapter0/frontend0 It displays info about the signal quality and the carrier/noise (C/N) ratio, which might help any investigation of where the driver fails to cope as you change what you are feeding it. I noticed your dvbv5-scan showed C/N around 20dB but the manpage shows 'good signal' with C/N of 36dB which suggests the device should be expected to deal with higher signal levels. Once you figured out the signal level, did a dvbv5-scan work with no errors? In the example you showed I saw the channels getting 'lock' but then some kind of error occurred. Regards Vince
Re: [progress]: dvb_usb_rtl28xxu not tuning "Leadtek Winfast DTV2000 DS PLUS TV"
On 26/09/17 14:32, Eyal Lebedinsky wrote: On 18/09/17 14:26, Eyal Lebedinsky wrote: I have just upgraded to f24. I am now using the standard dvb_usb_rtl28xxu fe which logs messages suggesting all is well (I get the /dev/dvb/adapter? etc.) but I get no channels tuned when I run mythfrontend or scandvb. Is anyone using this combination? Is this the correct way to use this tuner? BTW: Until f22 I was using the out of kernel driver from https://github.com/jaredquinn/DVB-Realtek-RTL2832U.git but I now get a compile error. TIA This is an FYI in case anyone else stumbles on this thread. While the problem persists, I managed to find a way around it for now. I changed the antenna input. Originally I used a powered splitter to feed all the tuners, and it worked well with the out-of-kernel driver. This driver does not build or work with a more modern kernel so I shifted to using dvb_usb_rtl28xxu which fails to tune. The new wiring splits (passive) the antenna in two, feeds one side directly to the two "Leadtek Winfast DTV2000 DS PLUS TV" cards (through another passive 2-way) and the other side goes to the old powered splitter that feeds a few USB tuners. Now all tuners are happy. It seems that the "Leadtek Winfast DTV2000 DS PLUS TV" cannot handle the amplified input while the USB tuners require it. I hope that there is a way to set a profile in dvb_usb_rtl28xxu to attenuate the input to an acceptable level thus unravelling the antenna cables rat-nest. Looking further, I think that it is the fc0013 tuner that should manage the lna but does not. Compare it to the module in here https://github.com/jaredquinn/DVB-Realtek-RTL2832U/blob/master/src/tuner_fc0013.c which I was using successfully (unfortunately this repo does not build or work with current linux kernels). Is this possible? If so, can it be fixed? cheers cheers -- Eyal Lebedinsky (e...@eyal.emu.id.au)
Re: [progress]: dvb_usb_rtl28xxu not tuning "Leadtek Winfast DTV2000 DS PLUS TV"
On 18/09/17 14:26, Eyal Lebedinsky wrote: I have just upgraded to f24. I am now using the standard dvb_usb_rtl28xxu fe which logs messages suggesting all is well (I get the /dev/dvb/adapter? etc.) but I get no channels tuned when I run mythfrontend or scandvb. Is anyone using this combination? Is this the correct way to use this tuner? BTW: Until f22 I was using the out of kernel driver from https://github.com/jaredquinn/DVB-Realtek-RTL2832U.git but I now get a compile error. TIA This is an FYI in case anyone else stumbles on this thread. While the problem persists, I managed to find a way around it for now. I changed the antenna input. Originally I used a powered splitter to feed all the tuners, and it worked well with the out-of-kernel driver. This driver does not build or work with a more modern kernel so I shifted to using dvb_usb_rtl28xxu which fails to tune. The new wiring splits (passive) the antenna in two, feeds one side directly to the two "Leadtek Winfast DTV2000 DS PLUS TV" cards (through another passive 2-way) and the other side goes to the old powered splitter that feeds a few USB tuners. Now all tuners are happy. It seems that the "Leadtek Winfast DTV2000 DS PLUS TV" cannot handle the amplified input while the USB tuners require it. I hope that there is a way to set a profile in dvb_usb_rtl28xxu to attenuate the input to an acceptable level thus unravelling the antenna cables rat-nest. cheers -- Eyal Lebedinsky (e...@eyal.emu.id.au)
