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Old 06-16-2003, 02:40 PM   #31
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The satellites's uplink is in New Jersey, so the FCC has to be aware of where it is in the country. The up/down link frequencies are just on file for reference, in the event of any interference issues or something like that from anyone else the FCC knows exactly what it is in the area.
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Old 06-16-2003, 03:10 PM   #32
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Quote:
Originally Posted by roscoryan
With the Sirius satellites setup the way they are, Sirius needs far fewer repeaters in urban areas than XM. That results in much more money to spend on other ventures.

One of the biggest worries about XM right now is how much money they are burning.
It'd be interesting to see the cost differential between the extra (3rd) satellite vs. the cost of the extra repeaters. XM with 2 satellites + lots of repeaters vs. 3 satellites and few repeaters?
Satellites aren't cheap, you know. And... they satellites need to be replaced every so many years, you gotta replace 3 instead of 2.

Either way, I prefer Sirrius's effort and approach to have a near repeaterless service. This is the way it should be.
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Old 02-08-2004, 11:24 AM   #33
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Default Caribbean

I'm on a Caribbean cruise on the Island Princess right now. So far Sirius has been full quieting with three antenna bars off the coast of Cuba, in Jamaica, Grand Cayman and a long ways south of the Caymans. I'll know within two days if Sirius can reach the Panama Canal. I'm betting that it can. FWIW The Princess stateroom TVs will not work with an audio connection from Sirius without some sort of video input. No matter. Headphones work quite well with the mobile or home Audiovox PnP.
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Old 02-08-2004, 11:27 AM   #34
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WOW!!!!!!!!!

Thanks for updating us!

Have a GREAT trip!
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Old 02-08-2004, 04:20 PM   #35
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Quote:
Originally Posted by BuggyBoyVT
The satellites's uplink is in New Jersey
How many uplink dishes do they have? Is it 1 for each satellite?

I would assume that any of the satellites would be available within it's footprint but only as far north or south as the uplink could "see" them.
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Old 02-08-2004, 05:23 PM   #36
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Default Re: Caribbean

Quote:
Originally Posted by w0kie
I'm on a Caribbean cruise on the Island Princess right now. So far Sirius has been full quieting with three antenna bars off the coast of Cuba, in Jamaica, Grand Cayman and a long ways south of the Caymans. I'll know within two days if Sirius can reach the Panama Canal. I'm betting that it can. FWIW The Princess stateroom TVs will not work with an audio connection from Sirius without some sort of video input. No matter. Headphones work quite well with the mobile or home Audiovox PnP.
And perhaps I don't understand the mechanics of the orbit, but it looks to me like the service should work in South America as well. It looks to me as if the sats travel the full length (for the most part) of North and South America. Is this right?
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Old 02-08-2004, 05:24 PM   #37
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From what I have gathered there is two dishes in New Jersey, and one in Ecuador for TT&C purposes when a third satellite is out of visible range of the NJ site.
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Old 02-08-2004, 05:31 PM   #38
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Default Re: Caribbean

Quote:
And perhaps I don't understand the mechanics of the orbit, but it looks to me like the service should work in South America as well. It looks to me as if the sats travel the full length (for the most part) of North and South America. Is this right?
Only two of the three satellites broadcast at any one time. When one satellite sets the below the Equator, it hands off transmission to a satellite that is rising above the equator. So as the satellite that was setting passes over South America, it is not transmitting any longer. It goes dormant until it rises above the Equator to take another satellites place.

For visual reference: Sirius Satellite 3D Orbit Animation
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Old 02-08-2004, 05:34 PM   #39
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Default Re: Caribbean

Quote:
Originally Posted by BuggyBoyVT
Quote:
And perhaps I don't understand the mechanics of the orbit, but it looks to me like the service should work in South America as well. It looks to me as if the sats travel the full length (for the most part) of North and South America. Is this right?
Only two of the three satellites broadcast at any one time. When one satellite sets the below the Equator, it hands off transmission to a satellite that is rising above the equator. So as the satellite that was setting passes over South America, it is not transmitting any longer. It goes dormant until it rises above the Equator to take another satellites place.

For visual reference: Sirius Satellite 3D Orbit Animation
Thanks. I guess it's physically possible to hear Sirius all the way to Tierra Del Fuego but they just turn off the broadcasting (probably so as to not piss off SA governments, or at least to avoid having to get a license). The link clears it up for me mucho!
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Old 02-08-2004, 05:36 PM   #40
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Default Re: Caribbean

Quote:
Originally Posted by jmuskratt
Quote:
Originally Posted by BuggyBoyVT
Quote:
And perhaps I don't understand the mechanics of the orbit, but it looks to me like the service should work in South America as well. It looks to me as if the sats travel the full length (for the most part) of North and South America. Is this right?
Only two of the three satellites broadcast at any one time. When one satellite sets the below the Equator, it hands off transmission to a satellite that is rising above the equator. So as the satellite that was setting passes over South America, it is not transmitting any longer. It goes dormant until it rises above the Equator to take another satellites place.

For visual reference: Sirius Satellite 3D Orbit Animation
Thanks. I guess it's physically possible to hear Sirius all the way to Tierra Del Fuego but they just turn off the broadcasting (probably so as to not piss off SA governments, or at least to avoid having to get a license). The link clears it up for me mucho!
That is part of the reason, but the biggest reason why is because Sirius utilizes all of its allocated spectrum (12.5 MHz) with 2 satellite and 1 terrestrial feed (for any given area). So, there isn't "room" to operate another satellite.
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Old 02-08-2004, 05:39 PM   #41
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Default Re: Caribbean

Quote:
Originally Posted by BuggyBoyVT

That is part of the reason, but the biggest reason why is because Sirius utilizes all of its allocated spectrum with 2 satellite and 1 terrestrial feed (for any given area). So, there isn't "room" to operate another satellite.

But I also assume that the FCC really has no standing to complain about transmitions outside of the US. Like how stations just across the border in Mexico can broadcast at whatever wattage they want, whenever they want.
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Old 02-08-2004, 05:43 PM   #42
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The FCC gave Sirius broadcasting authority for CONUS (Continental US) which usually implies some degree of signal leakage around Canada/Mexico. But, I do believe that it is part of the FCC approval process of CONUS licenses to notify the ITU.. To further notify any other countries involved that could receive any amount of signal from those satellites.

Sirius is currently trying to receive approval from the CRTC, for authorization to build terrestrial repeaters in Canada and for a license to sell service there.
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Old 02-08-2004, 10:41 PM   #43
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Default Old Russian spy satellite orbits

Last year I spoke to a Sirius engineer that told me that Sirius had the orginal rights to XM's Satellite positions in space but choose the eliptical orbits instead. He said that the current orbits are old Russian spy satellite orbits and that the Russians had perfected these orbits years ago. He said that the satellites require seasonal rocket firing to mantain that exact orbits although gravitational forces take care of the rest.
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Old 02-08-2004, 11:42 PM   #44
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Quote:
Originally Posted by roscoryan
With the Sirius satellites setup the way they are, Sirius needs far fewer repeaters in urban areas than XM. That results in much more money to spend on other ventures.

One of the biggest worries about XM right now is how much money they are burning.
the downside is that the sirius birds have TO USE fuel to maintain that figure 8 orbit. while the XM birds (ROCK and ROLL... lol) fly the geo sync pattern, their lifetime cost is less than the sirius ones...
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Old 02-09-2004, 01:29 AM   #45
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And that matters why exactly?

Currently,
XM is busy perfecting terms to launch XM-3 (replacement) and will have to purchase a new satellite to replace XM-1 and XM-2 within the next 4 years.

While Sirius is perfectly fine financially, and will currently get 15 years out of all 3 satellites. (Late 2015)... And they have virtually no debt, and all 3 satellite are completely paid for.

Satellite costs for Sirius, mean nothing...
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