On Thu, 2005-08-18 at 14:10 +0200, Daan de Beer wrote: > As promised I took a shot at checking the tuning code to figure out why my > tuning was so bad. > > I have for example the channel RTL7. This is located at 648000000 Hz. > Therefore I must use channel 43 which is at 647250000 Hz. <cut fine tune stuff> You can specify the exact frequenty in dtv_multiplex.
BTW When using V4L2 you can never specify the frequency exactly. If the card supports VIDEO_TUNER_LOW, you can tune within 62.5 Hz, but if it doesn't you can only tune within 62500 Hz. This isn't a huge problem since the hardware can find the exact frequency by syncing to the carrier with a PLL. With V4L1 you can only tune within 62500 Hz. The changes in fine tune were a couple months back, and had to do with a systematic error that crept into higher frequencies with the old calculation. Search for the commit message for a more detailed explanation. -- Daniel
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