Yeah, I figured about as much, and whether signal is converted or not is not exactly readily available in the average user manual.
I was thinking maybe I could simply split the RCA signal, run it to my TV, and a VHS player, then have the VHS either output directly to the PVR if possible; if not, record gameplay on to tape, then play it back into the PVR or something.
At the going price for the scan converter and linedoubler, I might as well simply invest in a PAL N64 console and games (which I think work fine and dandy with the PVR) or try and find a DVD box that will convert the signal, or at least record the N64, so I can playback into the PVR, or something.
Maybe I'll find a good deal on ebay soon, though. We'll see what happens.
I appreciate all the help, really.