I have a Series 2 dual tuner Tivo. I bought it used, and I think I only got the IR cable (blaster?) with it. Today, I had Comcast installed with a digital cable box. I followed the intructions from the Tivo site online, did the splitter thing, and hooked up the IR blaster thing. Went through the set up, and the Tivo was able to change the channels successfully. When all was done, I seemed to be able to change channels without a problem.
However, I left and then came home to find that now the Tivo wasn't able to change the channels on the cable box most of the time. It was able to do some channels, but not a lot of others, especially the lower numbers that used to be/still are? analog. At any rate, if I get the serial cable, will that improve things?