Quoting Francisco Woodland <[EMAIL PROTECTED]>: > Hello everyone, > > About a week ago I bought a PVR-500 (Samsung tuners) > to put in the MythTV box I was making. Using the > 0.4.2 ivtv drivers along with the tuner.c patch that > Hans recently posted to the mailing list (thanks!), I > believe I have both tuners working and accessible in > MythTV. The problem I am having is with the reception > and sound on tuner 0. > > First of all, the quality of the output of tuner 1 is > excellent. However, the quality of the output of > tuner 0 is quite fuzzy, especially on some of the > lower channels. In addition to that, tuner 0 seems to > have intermittent sound problems. Sometimes when I > switch to a channel with tuner 0, I will get this > loud, high buzzing sound along with the TV audio. > However, when I switch channels, eventually this > problem goes away, even if I go back to the same > channel I was originally on. > > I read some notes about the PVR-500 being particularly > sensitive to signal strength, so I went out and bought > an amplifier from Radio Shack to see if that would > solve the problem. While I did see a slight increase > in picture quality on tuner 0 (it's still not what I > would like), the sound problem is still there and > doesn't seem to have gotten any better. > > Is there anything else I can do to fix this problem? > Might I have a bad PVR-500? No, you don't have a bad PVR-500. It seems to be a common problem with PVR-500s that carry a Samsung tuner, and one that is not present when using the same hardware under Windows.
That said, I believe that at this point, Samsung tuner support in tuner.c is most likely complete. Most likely when they added the Samsung tuner, Hauppauge changed something else in the board that requires different/additional steps to fully initialize the board, and the ivtv driver is not reliably performing the correct steps. Things that I am positive of: This only affects the first tuner on the card. The first tuner on the card is the only one that has an additional FM radio tuner It is the fault of the driver somewhere. Tuner 0 *sometimes* works well under Linux but not often, Tuner 0 *always* works flawlessly under Windows when I tested it with SnapStream BeyondTV. (On that note, does anyone have any reccomendations for a good Windows-based test app that is free? WinTV2000 from Hauppauge only works on the PVR-250 and 350 boards.) Things that I am rather sure of: The only affected channels on the first tuner fall within the 65-108 MHz tuner range of the Philips FM tuner that is also present on the first tuner. All of my problem channels fall in this range, but I have no signal to test with on us-cable 95-99 which also fall within this range. Thus, the problem is most likely connected to the fact that an additional FM tuner is present on tuner 0. How, I do not know. Most likely to solve this a complete i2c log covering *everything* on the first tuner section, not just the Samsung module, would have to be taken. With proper instructions, I could take such a log in a week or so. (The PVR-500 is currently in a Linux-only server box, but I can move it back to my dual-boot desktop machine temporarily in a week or so.) _______________________________________________ ivtv-users mailing list [email protected] http://ivtvdriver.org/mailman/listinfo/ivtv-users
