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29 replies to this topic

#26 OFFLINE   P Smith

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Posted 29 January 2010 - 11:34 AM

Are you saying that 30.0 Msps with 8/9 FEC using 8PSK-DVBS2 is not possible?

Umm ? What is your relation between Msps and Mbps ?
Why you lowered number ? In prev post it was much high:

(2) DVB-S2 transponders at ~75 Mbps each for a total of 150 Mbps.



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#27 OFFLINE   jdeitchler

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Posted 01 February 2010 - 01:44 PM

MSPS = Mega symbols per second (a variable in calculating usable payload for a satellite transponder)
Mbps = Mega bits per second (as in data measurement)

30 MSPS * 3 bits per symbol (for 8PSK) * 8/9 FEC * 188/204 (Reed Solomon) ~ 75 Mbps

#28 OFFLINE   P Smith

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Posted 01 February 2010 - 03:22 PM

Ideally, but that's FEC=8/9 ... perhaps 9/10 would be better, but for low power FSS sat ?

OK, it's time to find real numbers from AMC-16.

#29 OFFLINE   P Smith

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Posted 08 February 2010 - 07:23 PM

Surfing the AMC-16 and I don't see signal close to before mentioned
"30 MSPS * 3 bits per symbol (for 8PSK) * 8/9 FEC * 188/204 (Reed Solomon) ~ 75 Mbps".

Max levels at :
11804,V,DVB-S,21500 - ~33 mbps [ESM]
12147,V,??????,30000 (my cards can not lock to it as DVB-S or DVB-S2 or DC-II !)
11997,H,DVB-S2,24000 - ~40 mbps [AOL]
12030,H,DVB-S2,24000 - ~46 mbps [AOL]

I don't see how you would accumulate 2x75 Mbps and 150 Mbps total.
And remember - the sat is FSS, ie low powered.

Edited by P Smith, 11 February 2010 - 12:37 PM.
Two tpns shows AOL id.


#30 OFFLINE   P Smith

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Posted 11 February 2010 - 01:45 AM

Time to look into Ka part of the sat ;).

Ka-band

Main transponders 12
Backup transponders 6
Power 75 W (LTWTA)
Bandwidth 125 MHz (3 x 39 MHz subchannels)
Coverage CONUS, Hawaii, Alaska; 12 spots
EIRP max 57 dBW
Polarization
Frequencies Uplink: 28.4-28.6 GHz & 29.5-30 GHz
Downlink: 18.6-18.8 GHz & 19.7-20.2 GHz






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