I am assuming you have a relative new kernel (=>2.4) which should already contain the 'bttv' modules. If you do not, there are tutorials on the Internet on how to add the modules, try google.com.

1. Add the following lines to /etc/modules
tuner
bttv

2. Add the following lines to /etc/modules.conf
alias char-major-81 videodev
alias char-major-81-0 bttv
options tuner type=37
options bttv pll=1 radio=0 card=2

- type=37 tells the tuner module which tuner is on the card. The Spirit TV Tuner SCP1000 use an LG Pal tuner, which is identified by bttv as '37'.
- pll=1 tells bttv which type of crystal is on the card. The SCP1000 should use a 28MHz crystal, but if the picture appears to look distorted on the screen, but audio is ok, try changing the 'pll' setting to '2'.
    0: don't use PLL
    1: 28 MHz crystal installed
    2: 35 MHz crystal installed
- radio=0 tells bttv there is no FM radio support. My card didn't support it so it is set to '0'. If your TV tuner card has FM radio set 'radio' to '1'.
- card=2 tells bttv which specific card the TV tuner is. Spirit TV Tuner SCP1000 cards (that use a BT878 chipset) are not specifically supported by bttv. Card '2' is an old Hauppage TV tuner card which has a very close setup to the SCP1000, and so we can make bttv think we have that card and it will work.

3. Install xawtv if you haven't already. (downloadable from bytesex.org)

4. Configuring xawtv...
Open the file: ~/.xawtv
Open xawtv and use the up/down arrow keys to cycle through the channels. When you come to a channel number where you can see a picture, use the left/right arrow keys to 'fine tune' the reception and note what number is being displayed in brackets while fine tuning. Once you have that done, add the following lines to that file:
    [(channel name)]
    channel = (channel number)
    key = (channel shortcut key)
    fine = (-128..+127)
    capture = on

Example Channel Info to add to File:
    [SBS]
    channel = 45
    key = S
    fine = +7
    capture = on

    [ABC]
    channel = 48
    key = A
    fine = 0
    capture = on

Save the file when you have found all the channels you need to.

5. Congratulations. You can now watch TV on your computer.

NOTE: xawtv doesn't include 'radio' support. Have a look on freshmeat.net and find a program that will allow you to listen to the radio. (If you card supports it)