New SIRIUS Satellite Active - Page 3

Pinball Wizard · #21 09-07-2009, 10:03 PM

I'm wondering if they will shut down the service on AMC-6 and move the repeater antennas to FM-5.

Also does anyone know how this works. Have they gone to only one active satellite at any time out of the previous 3?

limegrass69 · #22 09-08-2009, 08:10 AM

I bet they'll gradually transition the ground repeaters over to FM-5. It will take some time to manually re-orient the receive dishes.

hexagram · #23 09-08-2009, 10:09 AM

Quote:

Originally Posted by Pinball Wizard

Also does anyone know how this works. Have they gone to only one active satellite at any time out of the previous 3?

I don't understand the question? Are you talking about the Sirius geosynchronous satellites?

You can call two of the three satellites at once (as the third one makes its return back to the CONUS)... This animation should help explain things:

JoeTan · #24 09-08-2009, 12:37 PM

If 2 are being used at a time does this make 1 moving sat and the stationary sat are the 2 now sending the signals?

Where would the stationary satellite be on that map?

Thank you drive through.

IdRatherBeSkiing · #25 09-08-2009, 01:51 PM

Quote:

Originally Posted by JoeTan

If 2 are being used at a time does this make 1 moving sat and the stationary sat are the 2 now sending the signals?

Where would the stationary satellite be on that map?

Thank you drive through.

The real question is do they need to deactivate one of the moving ones or can they have 3 signals at the same time?

**TSS Taylor** · #26 09-08-2009, 01:56 PM

Quote:

Originally Posted by IdRatherBeSkiing

The real question is do they need to deactivate one of the moving ones or can they have 3 signals at the same time?

From what I've heard it's 3 that are active. I could be wrong. So 2 of the 3 moving SATS are on and 1 Stationary is on. Total of 3 at once.

geosync · #27 09-08-2009, 02:45 PM

Awesome. Told my friend to take his antenna out of the windowsill (where he got spotty reception) and put it facing a wall in the southeasterly direction. He's got full signal now.

IdRatherBeSkiing · #28 09-08-2009, 03:22 PM

Quote:

Originally Posted by TSS Taylor

From what I've heard it's 3 that are active. I could be wrong. So 2 of the 3 moving SATS are on and 1 Stationary is on. Total of 3 at once.

Good. I had great reception last night + overnight + this morning. Hope it lasts.

Pinball Wizard · #29 09-08-2009, 10:23 PM

Here is how it used to work.......

As shown in Hexagram's excellent illustration above, there were 3 satellites in a 'tundra' orbit. At any one time 2 of those were above North America and were active. The other was keyed off to conserve power.

Sirius used 3 frequencies. 1 for the terrestrial repeaters which were fed from AMC-6 and 2 for the satellites. These were/are centered at 2322 & 2330.5 MHz. Since there were an odd number of satellites, at each pass over N. America each satellite changed frequency. In addition to all of that, Sirius did a time offset between the two frequencies to provide an error correction advantage.

Graphic from Radio Magazine July 1, 2001.

So each Sirius receiver was actually 3 receivers. One receiving the terrestrial signal and two others receiving the satellite signal. Although the system worked with only one of the three signals, best error correction and concealment happened when there were two receivable signals.

So now we have an additional satellite (FM-5) parked in the traditional arc over the equator. I've got to wonder what frequency is this thing on? Or maybe Sirius has been secretly manufacturing receivers that can handle 4 signals. I sure would like to know how all of this works.

btw, still no improvement here in the Washington, DC area with my Sirius OEM car radio.

IdRatherBeSkiing · #30 09-09-2009, 06:47 AM

Quote:

Originally Posted by Pinball Wizard

Here is how it used to work.......

As shown in Hexagram's excellent illustration above, there were 3 satellites in a 'tundra' orbit. At any one time 2 of those were above North America and were active. The other was keyed off to conserve power.

Sirius used 3 frequencies. 1 for the terrestrial repeaters which were fed from AMC-6 and 2 for the satellites. These were/are centered at 2322 & 2330.5 MHz. Since there were an odd number of satellites, at each pass over N. America each satellite changed frequency. In addition to all of that, Sirius did a time offset between the two frequencies to provide an error correction advantage.

Graphic from Radio Magazine July 1, 2001.

So each Sirius receiver was actually 3 receivers. One receiving the terrestrial signal and two others receiving the satellite signal. Although the system worked with only one of the three signals, best error correction and concealment happened when there were two receivable signals.

So now we have an additional satellite (FM-5) parked in the traditional arc over the equator. I've got to wonder what frequency is this thing on? Or maybe Sirius has been secretly manufacturing receivers that can handle 4 signals. I sure would like to know how all of this works.

btw, still no improvement here in the Washington, DC area with my Sirius OEM car radio.

My guess is the new sat would broadcast on one of the 2 sat bands augmenting the signal. Perhaps it even does both.