--On den 30 juni 2003 22:44 +0100 Edward Wildgoose <[EMAIL PROTECTED]> wrote:
I just can't get this wretched TT DVB-T 1.2 card to work reliably at all!!
Has ANYONE managed to get a DVB-T card working with VDR in a completely reliable way?
I have had a bunch of problems with my TT DVB-T 1.2 too. It now works quite reliably, but it still picks up of interference from somewhere, I have audio clicks and picture problems on some, but not all, channels. I very seldom have firmware craches now.
- At first I had lots of problem with just getting it to tune at all. I think that it needs a very stable 12V that also should preferably be a little bit above 12V, not 11.8V or lower. I bought a new power supply and moved away a 12V fan connection from the main board and got better results with the card. I think the DC/DC converter for the tuning power is to weak, it is some homebrew with a 555, and the voltage dips at higher frequencies.
- With a oscilloscope I see strange spikes on the I/F line from the tuner to the demodulator. They are spaced at about 18,3MHz which happens to be a third of the demodulators clock frequency. Though it could be something else that I pick up with the scope some strange way, I suspect that it is real and that it is a hardware bug. Sadly, data sheets on these things are hard to get, I suspect that there is a biasing problem on the demod input or something like that, at least I would like to have enough documentation to be able exclude those ideas that I have.
- I have lines traveling down the tv screen when using the composite output from the DVB-T card. I heard from another guy that has both a DVB-T and a DVB-C that he has the same on the DVB-T, but that the DVB-C is OK.
- When I have the driver loaded/firmware booted/whatever does it, my last tv in the antenna chain gets vertical or sloping lines over the screen on analog channels. When I unload the driver, the lines disappear.
All in all, I am not very impressed by this card.
Now when I have some DVB-T friends on the line:
Usa-x says that their DVB-T 1.2 cards look like this: <http://www.usa-x.org/1shop/popup_image.php?pID=7&language=en> My 1.2 card does not look like that, it has an ALPS tuner and a SP8870 demodulator on the main board, like the one here: <http://www.technotrend.de/english/products/pcproducts2-2.html>. Does anyone know if the design has changed and they don't really mean 1.2, or if they just have wrong picture?
I have also been thinking of bying a Nova-T to see if I at least can get better reception with that. There is a possibly new one called 1.3, which could be studied here: <http://www.usa-x.org/1shop/product_info.php?cPath=3&products_id=34&languag e=en>, pdf here: <http://www.usa-x.org/1/T1300.pdf>. This one looks like it could at least be fitted with a CI connector (yes, some DVB-T channels in Sweden are encrypted). Does anyone know if one gets this card if you buy a Hauppauge Nova-T, or if you get one without a CI connection? Does anyone know if this card is supported by the driver? Any recommendations?
/ragge
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