On Sat, 2008-07-12 at 15:37 -0500, Nick Bright wrote: > Greetings, > > I've got a WinTV HVR-1600, and I've gotten the cx18 driver to load but > I'm not able to get it to tune any digital channels. On the analog side > of the card with v4l, I do get video when doing "cat /dev/video1 > > test.mpg" but the quality is VERY poor. In MythTV backend setup using > the channel scanner on DVB0, the tuner is unable to lock any channels > (it should pick up ~10 channels).
[snip] > [EMAIL PROTECTED]:~$ scan > /usr/share/doc/dvb-utils/examples/scan/atsc/us-Cable-Standard-center-frequencies-QAM256 > > > scanning > /usr/share/doc/dvb-utils/examples/scan/atsc/us-Cable-Standard-center-frequencies-QAM256 > using '/dev/dvb/adapter0/frontend0' and '/dev/dvb/adapter0/demux0' > >>> tune to: 57000000:QAM_256 > WARNING: >>> tuning failed!!! > > With the same error reported for every channel. I don't know if my cable > system is actually QAM64 though, and there's not a scan template for > QAM64. I also tried the MythTV scanner with every combination of > frequency table, starting frequency, and QAM mode. None resulted in any > channels found - it's like the cable isn't even plugged in (but yes, it > is, and I have replaced it *twice* so it's extremely unlikely to be a > wiring problem). > > I'm not sure if this is an issue with the driver, or I'm just not > getting something right. This is the first time I've tried to use an > ATSC/QAM card with Linux. It may be worth noting that there is also a > PVR-150 installed in this machine, and it is working absolutely perfectly. This really does sound like a signal quality problem. Just double check the suggestions on this page to make sure you haven't got something in place that's really going to kill your SNR: http://www.ivtvdriver.org/index.php/Howto:Improve_signal_quality > I'd appreciate any suggestions for things to try. My goal is to get > unencrypted QAM channels to be available to MythTV. How does the analog capture look when you put the RF feeding the PVR-150 into the NTSC input of the HVR-1600? How does the analog capture of a VCR playing back a tape via RF channel 3 look when input to the NTSC input of the HVR-1600? How about when using a VCR or DVD to playback on the composite or svideo input of the HVR-1600? Regards, Andy > Thanks in advance for any suggestions or advice. > > - Nick > _______________________________________________ ivtv-users mailing list [email protected] http://ivtvdriver.org/mailman/listinfo/ivtv-users
