Transponder Change 4-29-9 AM

[JohnH]

UPLINK ACTIVITY: SAMPLE TAKEN 04-29-2009 02:12:00 TO 04-29-2009 02:13:06 ET

TRANSPONDER CHANGES

CHANGE Tp 27 EchoStar 3 61.5w ,QPSK SR 20000 FEC 5/6
TO Tp 27 EchoStar 3 61.5w ,8PSK SR 21500 FEC 2/3

0 CHANGE(S) 6418 CHANNELS IN THE SYSTEM

Note: I only count channel changes, not Transponder changes.

 

[HDRoberts]

This is where Fox News/Business and several Viacoms went. Good to see the slight jump in space with this move.

 

[digiblur]

Finally!

 

[PHXHoward]

Can you explain what this means and why it is exciting?

Thanks.

 

[digiblur]

Can you explain what this means and why it is exciting?

Thanks.

Look at Transponder 27 here : SatelliteGuys.US - Subscription 61.5°W

They had those HD channels packed into a QPSK mode transponder which yields around 30 megabits. In 8PSK mode it yields around 40 megabits. Between these two modes that Dish uses the 8PSK is more susceptible to rain fade so usually the power is upped a bit to overcome this, but with some sats there isn't any power to crank up.

 

[rocatman]

Look at Transponder 27 here : SatelliteGuys.US - Subscription 61.5°W

They had those HD channels packed into a QPSK mode transponder which yields around 30 megabits. In 8PSK mode it yields around 40 megabits. Between these two modes that Dish uses the 8PSK is more susceptible to rain fade so usually the power is upped a bit to overcome this, but with some sats there isn't any power to crank up.

They almost always increase the Forward Error Correction (FEC) in 8PSK usually to 2/3 from 5/6 for QPSK as was done in this case to reduce rain fade affects.

 

[digiblur]

I agree with that but isn't equal to the stability of what QPSK 5/6 offers, other wise 72.7 and 77 would also be using 8PSK 2/3.

 

[PHXHoward]

Oh so high picture quality? That is something to get excited about.

Thanks!