Sirius and XM In Troncones (More than you want to know)


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Escrito por Ernie Gorrie desde 24.69.19.187 (S010600045a22feb8.gv.shawcable.net) el día viernes, 20 de octubre, 2006 a las 14:03:48 horas :

En respuesta a: Re: xm satellite radio escrito por Greg in Alberta desde 209.115.232.65 (fw-center15.pason.com) el día viernes, 20 de octubre, 2006 a las 12:10:35 horas :

I have used a Sirius receiver in Troncones with only the occassional breakup.

Sirius and XM have different characteristics, based on their different satellite configurations.

XM has stationary satellites over the equator. They also aim their signals north for the US and Canadian markets. You can see from the graphic at:

http://www.digitalinsurrection.com/images/footprintxm.gif

that their broadcast footprint puts the Zihuatanejo area right on the edge.

Because XM's satellites are stationary and to the south, if there is a dead spot, it will likely be due to an obstacle to the south and will likely be a pretty fixed dead spot.

Sirius has three satellites in a figure-eight geo-synchronous, non-stationary path. Their paths take them from the Canadian Arctic to the tip of South America. The signals are not aimed like XM signals, so they tend to have a broader range. The power is turned off over South America to save power. A Sirius receiver is likely to have access to two signals from different locat1ons in the northern hemisphere at any given time.

The Sirius broadcast footprint is much larger. The graphic at:

http://satelliteradio.digitalinsurrection.com/siriusradio/siriusfootprint.jpg

shows Zihuatanejo well within the footprint.

Because the Sirius satellites are constantly in motion, dead spots may move around. The crisscross of the path is just south of Winnipeg. Winnipeg is due north of Zihuatanejo. So one of the signals will likely be coming from the north. The other may be coming from anywhere from southwest through to north or around to southwest. The graphic at:

http://www.heavens-above.com/orbitdisplay.asp?lat=0&lng=0&alt=0&loc=Unspecified&TZ=CET&satid=26626

shows the satellite path crossing the Pacific coast around the tip of Baja California Sur.





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