> Mauro, > > Resend of my proposed patch attached that reverts tuning regressions with > my DViCO card, whilst still fixing the original 6Mhz tuning issue. Please > merge or let me know how else I should proceed to get this merged. > > Thanks > > -Rob
perhaps the attached notes will help Rob's case here. I did a few more tests, with just one tuner. First I changed a cable that I was suspicious of (it was way too long anyway) but I got no significant improvement. Then I applied the 'revert2.diff' patch that Rob sent and cold-booted. I reran the test and got significantly lower BER and UNC values. There is still something odd going on, in that the UNC seem to get worse with repeated tunings to the same channel, a few minutes apart (less than 10min). This might be a measurement artefact, I don't know. I might try changing the channel order - that should test whether the trend of the UNC values is with frequency or order in the tuning sequence. Cheers VInce
2009-12-07 Try signaltest.pl again. First, with old cable and no code changes hg identify = c57f47cfb0e8+ tip tuner 0 is usbid 0fe9:db78 do three consecutive runs to see if things worsen with repeated tuning. Frequency Signal Ber Unc ========= ======== ======== ======== 177500000 75.9 % 318.9 376.2 191625000 74.5 % 280.1 904.9 219500000 77.0 % 245.2 1862.2 226500000 77.0 % 186.4 3525.4 571500000 77.1 % 502.9 6161.3 578500000 77.2 % 541.1 9128.8 Frequency Signal Ber Unc ========= ======== ======== ======== 177500000 75.5 % 314.6 11219.2 191625000 74.0 % 384.3 12057.3 219500000 76.8 % 118.7 13236.9 226500000 76.8 % 173.5 15256.6 571500000 77.0 % 472.3 17930.7 578500000 77.1 % 550.0 20888.8 Frequency Signal Ber Unc ========= ======== ======== ======== 177500000 75.4 % 346.0 23052.8 191625000 73.3 % 347.5 24087.7 219500000 76.7 % 236.0 25289.0 226500000 76.8 % 190.1 27241.0 571500000 76.9 % 541.1 29910.0 578500000 77.1 % 511.7 32902.1 Now repeat with the 1.5m cable connecting wall socket to splitter. cold boot the machine hg identify = c57f47cfb0e8+ tip dvb0.frontend0: usbid 0fe9:db78 Frequency Signal Ber Unc ========= ======== ======== ======== 177500000 74.0 % 288.2 784.8 191625000 73.3 % 487.2 1890.9 219500000 76.7 % 147.2 3189.8 226500000 76.8 % 202.2 5094.7 571500000 76.9 % 443.1 7640.6 578500000 76.9 % 499.9 10675.3 Frequency Signal Ber Unc ========= ======== ======== ======== 177500000 73.0 % 330.7 12795.4 191625000 72.6 % 291.8 13844.3 219500000 76.7 % 132.5 15005.5 226500000 76.8 % 136.2 16928.0 571500000 76.9 % 525.2 19480.7 578500000 77.0 % 522.7 22361.7 Frequency Signal Ber Unc ========= ======== ======== ======== 177500000 75.5 % 361.6 24584.2 191625000 73.8 % 480.9 25816.4 219500000 76.7 % 143.4 26962.2 226500000 76.8 % 187.5 28846.1 571500000 77.0 % 468.4 31448.9 578500000 77.0 % 547.3 34511.8 Now make the code change. Cold boot. dvb0.frontend0: usbid 0fe9:db78 Frequency Signal Ber Unc ========= ======== ======== ======== 177500000 76.5 % 0.0 0.0 191625000 76.9 % 136.8 102.3 219500000 76.9 % 297.6 549.0 226500000 76.8 % 304.7 1461.4 571500000 76.9 % 505.0 3801.0 578500000 77.0 % 573.7 6818.6 Frequency Signal Ber Unc ========= ======== ======== ======== 177500000 76.4 % 0.0 8345.0 191625000 76.8 % 169.7 8476.0 219500000 76.7 % 243.8 8967.2 226500000 76.9 % 271.6 9904.7 571500000 76.9 % 525.9 12097.4 578500000 77.1 % 554.9 15364.9 Frequency Signal Ber Unc ========= ======== ======== ======== 177500000 76.3 % 1.3 16835.0 191625000 76.7 % 225.0 16949.7 219500000 76.7 % 267.1 17432.5 226500000 76.8 % 254.4 18372.9 571500000 76.9 % 575.2 20573.7 578500000 77.0 % 512.7 23771.2
