Re: cx18, s5h1409: chronic bit errors, only under Linux

2009-06-11 Thread David Ward
On 06/10/2009 10:32 AM, Steven Toth wrote: David Ward wrote: Comcast checked the outlet on channels 2 (41 dB) and 83 (39 dB). I looked afterwards and saw that the first of those is analog programming, but the second just appears as analog noise on my TV set. (??) I asked them to check a spec

Re: cx18, s5h1409: chronic bit errors, only under Linux

2009-06-10 Thread Steven Toth
David Ward wrote: On 06/09/2009 03:26 PM, Steven Toth wrote: 30db for the top end of ATSC sounds about right. David, when you ran the windows signal monitor - did it claim QAM64 or 256 when it was reporting 30db? Steven and Devin, All the digital signals are 256 QAM. 39 is very good, exce

Re: cx18, s5h1409: chronic bit errors, only under Linux

2009-06-10 Thread David Ward
On 06/09/2009 03:26 PM, Steven Toth wrote: 30db for the top end of ATSC sounds about right. David, when you ran the windows signal monitor - did it claim QAM64 or 256 when it was reporting 30db? Steven and Devin, All the digital signals are 256 QAM. 39 is very good, exceptional. And did t

Re: cx18, s5h1409: chronic bit errors, only under Linux

2009-06-09 Thread Steven Toth
Devin Heitmueller wrote: On Tue, Jun 9, 2009 at 3:04 PM, Steven Toth wrote: 40db. -- Steven Toth - Kernel Labs http://www.kernellabs.com Just checked the source. It's 40dB for QAM256, but 30dB for ATSC and QAM64. Are we sure he's doing QAM256 and not QAM64? Devin 30db for the top end

Re: cx18, s5h1409: chronic bit errors, only under Linux

2009-06-09 Thread Devin Heitmueller
On Tue, Jun 9, 2009 at 3:04 PM, Steven Toth wrote: > > 40db. > > -- > Steven Toth - Kernel Labs > http://www.kernellabs.com > Just checked the source. It's 40dB for QAM256, but 30dB for ATSC and QAM64. Are we sure he's doing QAM256 and not QAM64? Devin -- Devin J. Heitmueller - Kernel Labs h

Re: cx18, s5h1409: chronic bit errors, only under Linux

2009-06-09 Thread Steven Toth
Devin Heitmueller wrote: On Tue, Jun 9, 2009 at 2:52 PM, David Ward wrote: On 06/09/2009 10:24 AM, Steven Toth wrote: David has called out Comcast to review his installation. After replacing all the connectors and some cables from the pole all the way to the outlet, their meter ultimately sho

Re: cx18, s5h1409: chronic bit errors, only under Linux

2009-06-09 Thread Steven Toth
Devin Heitmueller wrote: On Tue, Jun 9, 2009 at 2:52 PM, David Ward wrote: On 06/09/2009 10:24 AM, Steven Toth wrote: David has called out Comcast to review his installation. After replacing all the connectors and some cables from the pole all the way to the outlet, their meter ultimately sho

Re: cx18, s5h1409: chronic bit errors, only under Linux

2009-06-09 Thread Devin Heitmueller
On Tue, Jun 9, 2009 at 2:52 PM, David Ward wrote: > On 06/09/2009 10:24 AM, Steven Toth wrote: >> >> David has called out Comcast to review his installation. > > After replacing all the connectors and some cables from the pole all the way > to the outlet, their meter ultimately showed 39-40dB at t

Re: cx18, s5h1409: chronic bit errors, only under Linux

2009-06-09 Thread David Ward
On 06/09/2009 10:24 AM, Steven Toth wrote: David has called out Comcast to review his installation. After replacing all the connectors and some cables from the pole all the way to the outlet, their meter ultimately showed 39-40dB at the outlet. My card is showing the same SNR values as before.

Re: cx18, s5h1409: chronic bit errors, only under Linux

2009-06-09 Thread Steven Toth
Devin Heitmueller wrote: On Tue, Jun 9, 2009 at 10:21 AM, Steven Toth wrote: I ruled out 30db on ATSC because that sounds incredibly high, I assumed cable because that would be consistent with the numbers. You could well be right. -- Steven Toth - Kernel Labs http://www.kernellabs.com I agre

Re: cx18, s5h1409: chronic bit errors, only under Linux

2009-06-09 Thread Devin Heitmueller
On Tue, Jun 9, 2009 at 10:21 AM, Steven Toth wrote: > I ruled out 30db on ATSC because that sounds incredibly high, I assumed > cable because that would be consistent with the numbers. You could well be > right. > > -- > Steven Toth - Kernel Labs > http://www.kernellabs.com I agree it's high, but

Re: cx18, s5h1409: chronic bit errors, only under Linux

2009-06-09 Thread Steven Toth
David Ward wrote: On 06/08/2009 04:36 PM, Devin Heitmueller wrote: On Mon, Jun 8, 2009 at 4:20 PM, Steven Toth wrote: We're getting into the realm of 'do you need to amplify and/or debug your cable network', and out of the realm of driver development. Comcast is coming tomorrow to ch

Re: cx18, s5h1409: chronic bit errors, only under Linux

2009-06-09 Thread Steven Toth
Steven, One thing that is interesting is that he is getting BER/UNC errors even on ATSC, when he has a 30.2 dB signal. While I agree that the cable company could be sending a weak signal, 30 dB should be plenty for ATSC. Also, it's possible that the playback application/codec in question poorly

Re: cx18, s5h1409: chronic bit errors, only under Linux

2009-06-08 Thread Andy Walls
On Mon, 2009-06-08 at 16:20 -0400, Steven Toth wrote: > Try installing a decent cable amp. Try looking at the MythTV wiki and support > sites for improving your cable network. If using an amp, be sure you pick one with appropriate gain and noise figure. Overdriving the mxl5005s with too much

Re: cx18, s5h1409: chronic bit errors, only under Linux

2009-06-08 Thread Devin Heitmueller
On Mon, Jun 8, 2009 at 5:03 PM, David Ward wrote: > Devin, I would really really appreciate this.  I hesitated to e-mail this > list for several weeks, because I wanted to investigate thoroughly first and > avoid wasting anyone's time as much as possible.  I hope you are able to > reproduce this.

Re: cx18, s5h1409: chronic bit errors, only under Linux

2009-06-08 Thread David Ward
On 06/08/2009 04:36 PM, Devin Heitmueller wrote: On Mon, Jun 8, 2009 at 4:20 PM, Steven Toth wrote: We're getting into the realm of 'do you need to amplify and/or debug your cable network', and out of the realm of driver development. Comcast is coming tomorrow to check out the signal

Re: cx18, s5h1409: chronic bit errors, only under Linux

2009-06-08 Thread Devin Heitmueller
On Mon, Jun 8, 2009 at 4:20 PM, Steven Toth wrote: > David Ward wrote: >> >> On 06/08/2009 12:31 PM, Steven Toth wrote: >>> >>> Your SNR is very low, 0x12c is 30db. I assume you're using digital cable >>> this is borderline. >> >> Oh okay ... I wasn't sure how to translate those values before. >>

Re: cx18, s5h1409: chronic bit errors, only under Linux

2009-06-08 Thread Steven Toth
David Ward wrote: On 06/08/2009 12:31 PM, Steven Toth wrote: Your SNR is very low, 0x12c is 30db. I assume you're using digital cable this is borderline. Oh okay ... I wasn't sure how to translate those values before. I like my cable system at home to be atleast 32db (0x140) bare minimum, it'

Re: cx18, s5h1409: chronic bit errors, only under Linux

2009-06-08 Thread David Ward
On 06/08/2009 12:31 PM, Steven Toth wrote: Your SNR is very low, 0x12c is 30db. I assume you're using digital cable this is borderline. Oh okay ... I wasn't sure how to translate those values before. I like my cable system at home to be atleast 32db (0x140) bare minimum, it's typically 0x160 (

Re: cx18, s5h1409: chronic bit errors, only under Linux

2009-06-08 Thread Steven Toth
David Ward wrote: On 06/08/2009 10:17 AM, Devin Heitmueller wrote: On Mon, Jun 8, 2009 at 10:14 AM, Steven Toth wrote: Please let me know how I should proceed in solving this. I would be happy to provide samples of captured video, results from new tests, etc. When you tune using a

Re: cx18, s5h1409: chronic bit errors, only under Linux

2009-06-08 Thread David Ward
On 06/08/2009 10:17 AM, Devin Heitmueller wrote: On Mon, Jun 8, 2009 at 10:14 AM, Steven Toth wrote: Please let me know how I should proceed in solving this. I would be happy to provide samples of captured video, results from new tests, etc. When you tune using azap, and you can s

Re: cx18, s5h1409: chronic bit errors, only under Linux

2009-06-08 Thread Devin Heitmueller
On Mon, Jun 8, 2009 at 10:14 AM, Steven Toth wrote: >> Please let me know how I should proceed in solving this.  I would be happy >> to provide samples of captured video, results from new tests, etc. > > When you tune using azap, and you can see UNC and BER values, what is the > SNR value and does

Re: cx18, s5h1409: chronic bit errors, only under Linux

2009-06-08 Thread Steven Toth
Please let me know how I should proceed in solving this. I would be happy to provide samples of captured video, results from new tests, etc. When you tune using azap, and you can see UNC and BER values, what is the SNR value and does it move over the course of 30 seconds? -- Steven Toth - Ke