On Fri, 2010-02-12 at 16:26 -0500, Kyle Lil wrote:
> Thanks, Devin. Below is the output of azap. I'm assuming that the
> errors are occurring at the same time the video/audio glitches would
> be. I think it is slightly worse on some channels than on others (but
> not drastically). The example below is from one of the worse
> channels. 
> 
> using '/dev/dvb/adapter0/frontend0' and '/dev/dvb/adapter0/demux0'
> tuning to 799789900 Hz
> video pid 0x0000, audio pid 0x0000
> status 00 | signal 0000 | snr 0000 | ber 00000000 | unc 00000000 | 
> status 1f | signal 013e | snr 013e | ber 000019a7 | unc 000019a7 | FE_HAS_LOCK
> status 1f | signal 0145 | snr 0145 | ber 00000000 | unc 00000000 | FE_HAS_LOCK
> status 1f | signal 0145 | snr 0145 | ber 00000000 | unc 00000000 | FE_HAS_LOCK
> status 1f | signal 0146 | snr 0146 | ber 00000000 | unc 00000000 | FE_HAS_LOCK
> status 1f | signal 0145 | snr 0145 | ber 00000000 | unc 00000000 | FE_HAS_LOCK
> status 1f | signal 0146 | snr 0146 | ber 00000000 | unc 00000000 | FE_HAS_LOCK
> status 1f | signal 0145 | snr 0145 | ber 00000000 | unc 00000000 | FE_HAS_LOCK
> status 1f | signal 0145 | snr 0145 | ber 00000267 | unc 00000267 | FE_HAS_LOCK
> status 1f | signal 0146 | snr 0146 | ber 00000000 | unc 00000000 | FE_HAS_LOCK
> status 1f | signal 0146 | snr 0146 | ber 00000000 | unc 00000000 | FE_HAS_LOCK
> status 1f | signal 0146 | snr 0146 | ber 00000000 | unc 00000000 | FE_HAS_LOCK
> status 1f | signal 0145 | snr 0145 | ber 00000000 | unc 00000000 | FE_HAS_LOCK
> status 1f | signal 0145 | snr 0145 | ber 00000000 | unc 00000000 | FE_HAS_LOCK
> status 1f | signal 0145 | snr 0145 | ber 00000000 | unc 00000000 | FE_HAS_LOCK
> status 1f | signal 0145 | snr 0145 | ber 00000000 | unc 00000000 | FE_HAS_LOCK
> status 1f | signal 0146 | snr 0146 | ber 00000000 | unc 00000000 | FE_HAS_LOCK
> status 1f | signal 0145 | snr 0145 | ber 00000000 | unc 00000000 | FE_HAS_LOCK
> status 1f | signal 0145 | snr 0146 | ber 00000000 | unc 00000000 | FE_HAS_LOCK
> status 1f | signal 0145 | snr 0145 | ber 00000000 | unc 00000000 | FE_HAS_LOCK
> status 1f | signal 0146 | snr 0146 | ber 00000000 | unc 00000000 | FE_HAS_LOCK
> status 1f | signal 0145 | snr 0145 | ber 00000000 | unc 00000000 | FE_HAS_LOCK
> status 1f | signal 0145 | snr 0145 | ber 00000000 | unc 00000000 | FE_HAS_LOCK
> status 1f | signal 0146 | snr 0146 | ber 00000000 | unc 00000000 | FE_HAS_LOCK
> status 1f | signal 0145 | snr 0145 | ber 00000000 | unc 00000000 | FE_HAS_LOCK
> status 1f | signal 0146 | snr 0146 | ber 00000000 | unc 00000000 | FE_HAS_LOCK
> status 1f | signal 0146 | snr 0146 | ber 00000000 | unc 00000000 | FE_HAS_LOCK
> status 1f | signal 0145 | snr 0145 | ber 00000000 | unc 00000000 | FE_HAS_LOCK
> status 1f | signal 0146 | snr 0145 | ber 00000000 | unc 00000000 | FE_HAS_LOCK
> status 1f | signal 0146 | snr 0146 | ber 00000000 | unc 00000000 | FE_HAS_LOCK
> status 1f | signal 0145 | snr 0145 | ber 00000000 | unc 00000000 | FE_HAS_LOCK
> status 1f | signal 0146 | snr 0146 | ber 00000000 | unc 00000000 | FE_HAS_LOCK
> status 1f | signal 0146 | snr 0146 | ber 00000000 | unc 00000000 | FE_HAS_LOCK
> status 1f | signal 0146 | snr 0146 | ber 00000000 | unc 00000000 | FE_HAS_LOCK
> status 1f | signal 0145 | snr 0145 | ber 00000000 | unc 00000000 | FE_HAS_LOCK
> status 1f | signal 0146 | snr 0146 | ber 00000000 | unc 00000000 | FE_HAS_LOCK
> status 1f | signal 0145 | snr 0145 | ber 00000000 | unc 00000000 | FE_HAS_LOCK
> status 1f | signal 0145 | snr 0145 | ber 00000000 | unc 00000000 | FE_HAS_LOCK
> status 1f | signal 0146 | snr 0146 | ber 00000000 | unc 00000000 | FE_HAS_LOCK
> status 1f | signal 0146 | snr 0145 | ber 00000000 | unc 00000000 | FE_HAS_LOCK
> status 1f | signal 0146 | snr 0146 | ber 00000000 | unc 00000000 | FE_HAS_LOCK
> status 1f | signal 0146 | snr 0146 | ber 00000264 | unc 00000264 | FE_HAS_LOCK
> status 1f | signal 0146 | snr 0146 | ber 00000000 | unc 00000000 | FE_HAS_LOCK
> status 1f | signal 0145 | snr 0145 | ber 00000000 | unc 00000000 | FE_HAS_LOCK
> status 1f | signal 0145 | snr 0145 | ber 00000000 | unc 00000000 | FE_HAS_LOCK
> status 1f | signal 0146 | snr 0145 | ber 00000000 | unc 00000000 | FE_HAS_LOCK
> status 1f | signal 0145 | snr 0146 | ber 00000000 | unc 00000000 | FE_HAS_LOCK
> status 1f | signal 0146 | snr 0146 | ber 00000000 | unc 00000000 | FE_HAS_LOCK
> status 1f | signal 0145 | snr 0145 | ber 00000000 | unc 00000000 | FE_HAS_LOCK
> status 1f | signal 0145 | snr 0145 | ber 00000000 | unc 00000000 | FE_HAS_LOCK


This looks like EMI of some sort to me.  (Either that or some tracking
loop in the digital tuner or demod losing lock - but then SNR would
likely dip).

EMI might be coming from inside the PC.  Does your computer under linux
happen to write to disk every 30 seconds or so?


Regards,
Andy



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