Yes it will work just fine you can either use your current directv remote to control the channels or the tv card should come with a infared relay system you stick over the receiver on the set top box. The easiest way to do it may be to hook it up through the s-video in and audio inputs provided your Dtv box has the outputs, if not just hook it up through the analog input as more than likely that is how your Dtv box is setup especially since you say you are using it with a 13" tv. I can't imagine that tv having digital input.
Curious what info did you come across that made you question it's usability?
Does your Dtv box have a coaxial digital out if it does that is the best option cause it makes it easier for the tv card to render the video since with an analog signal it has to run it through the digital to analog converter.
Curious what info did you come across that made you question it's usability?
Does your Dtv box have a coaxial digital out if it does that is the best option cause it makes it easier for the tv card to render the video since with an analog signal it has to run it through the digital to analog converter.