by Gunman » Wed May 21, 2003 6:56 pm
Ha ha I can explain a few things about both since I have xm and sirrius. XM uses geo stationary satellites, which means they "fall" at the same rate the earth does, so essentially they dont move and are always located in the south east and respectably same on the west coast. To reach areas that cant be seen by the recievers, they use many many repeaters. So for the most part, they are set up as a terrestial music source. Every time your listening to xm its more than likely your listening to the fm repeater signal. It will use the fm band first and if you leave that coverage, then switch to satellite feed. XM has a lower bit rate than sirrius, but the company that developed them is the original creators of mp3, and have the mp3 pro incorporated into the tuners to help boost the weaker frequencies. On the 60 music station that xm has, about 20 are only commercial free, the others have up to 6-12 mins of commercials per hour.
Sirrius on the other hand uses 3 geo syncrozied satellites that constantly do figure 8's over the U.S. They operate at a higher altitude and face straight down. Sirrius is a satellite music feed, meaning your listening to a direct feed rather than a repeater(they do use repeaters, but not as many as xm, so placement of the antenna on your roof is very important, since it depends on the satellite feed first). So you have less drop outs as opposed to xm. They have a higher bit rate than xm, and get a better digital signal, sounding better in your car. All of their music stations have........zero, nil, zilch, none, no commercials ever! Thats why their fee is an extra 2 dollars per month, cause they dont have the sponsorship of commercials. Most important sirrius plays better music, xm plays lots of "b" side songs no one really heard of. Right now if you get any sirrius ready radio, you get the tuner for free! You just have to buy which ever antenna you want to go with. I really perfer my sirrius over my xm.
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