[linux-dvb] Leadtek WinFast DTV1000-T problems

Soyeb Aswat soyeb at btinternet.com
Tue Oct 11 08:05:21 CEST 2005


Hello,

The combination of the cx22702 and Thompson tuner make for a
particularly non-sensitve card.  I have similar problems with my Nova-T
which is almost identical.

Soyeb


On Tue, 2005-10-11 at 15:56 +1000, Shirley, David wrote:
> Hi All,
> 
> I purchased one of these recently; it has LR6550 written on the back of
> it.
> 
> Here is what I know about it, cx2388 chipset, cx22702 remod, Thompson
> 7579 tuner - the card it self has RF IN + BYPASS, analogue IN + Svideo
> IN, + remote control.
> 
> I have modded cx88-cards.c and some other files to add the PCI ID's and
> the card is detected.
> 
> I can also receive a signal and capture picture using dvbstream |
> mplayer.
> 
> HOWEVER the problem I have is tzap only gets 0x0031 (+/- 2) for the
> signal strength. Also the SNR is usually 0xffff when LOCKED.
> 
> Also when I unplug the antenna or fake a bad signal (ie unplug it a
> little bit + wiggle) then the signal actually INCREASES to something
> like 0x0050 (always 0x00xx thou)
> 
> Anyway this "low signal strength" causes Mythtv to ignore the card I
> think.
> 
> Has anyone got any ideas/experience with this to help me out.
> 
> Linux 2.6.14-rc3 if you are interested.
> 
> Here is the tzap output using latest v4l-kernel + dvb-kernel cvs.
> 
> tzap -c /usr/share/doc/dvb-utils/examples/channels.conf-dvbt-australia
> "Ten HD"
> using '/dev/dvb/adapter0/frontend0' and '/dev/dvb/adapter0/demux0'
> tuning to 219500000 Hz
> video pid 0x0202, audio pid 0x0000
> status 00 | signal 0030 | snr 8000 | ber 00003fff | unc 00000000 | 
> status 1f | signal 0030 | snr ffff | ber 00000000 | unc 00000000 |
> FE_HAS_LOCK
> status 1f | signal 0030 | snr ffff | ber 00000000 | unc 00000000 |
> FE_HAS_LOCK
> status 1f | signal 0030 | snr ffff | ber 00000000 | unc 00000000 |
> FE_HAS_LOCK
> 
> As you can see from below, Michael Krufky has added this card into the
> cx88-cards.c in CVS.
> 
> Cheers
> Dave
> 
> 
> 
> -----Original Message-----
> From: Michael Krufky [mailto:mkrufky at linuxtv.org] 
> Sent: Tuesday, 11 October 2005 3:34 PM
> To: Linux and Kernel Video
> Cc: Shirley, David
> Subject: Re: Leadtek WinFast DTV1000-T
> 
> Shirley, David wrote:
> > Hi Michael,
> > 
> > Sure thing, first here is my tzap:
> [snip]
> > Here is the patch:
> 
> Thank you.  I have added your patch into v4l-kernel cvs.  "WinFast 
> DTV1000-T" is now cx88 card #35.  Please grab and install a copy of 
> v4l-kernel cvs and confirm that it works properly.
> 
> http://linuxtv.org/v4lwiki/index.php/How_to_build_from_CVS
> 
> If you have any more patches to submit, please work from v4l-kernel cvs.
> 
> About the bug that you are reporting about signal strength / snr 
> etc.....  The linuxdvb mailing list (subscriber-only: 
> http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb) is more 
> appropriate place to ask about it.  It might be a good idea for you to 
> try using the cx22702 frontend driver in dvb-kernel cvs before writing 
> to that list.  You can get combined cvs trees installed using most 
> recent v4l cx88 driver + most recent dvb cx22702 driver by using the 
> merge-trees make option, explained in the HOWTO above.
> 
> Good Luck,
> Michael Krufky
> 
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