3 replies to this topic

[Lutz]

Is where a recommendation on wich channels to align a disk for Astra 1, Astra 2 and Astra 3?
Does it makes sense to align the dish with a HD channel, an extra strong channel, or a week channel? I only can receive free to air channels.

How much SNR in dB is needed for error free reception?

For Astra 1 I have always used Das Erste, a German TV program, but I forgot about the reasoning behind.

[el bandido]

I usually align the dish using a weak channel or transponder.
Here is an approximate list of how much signal you need to open a channel. This list shows the minimum amount needed.

DVB-S2    QPSK    
1/4(FEC)    -2.4 db(SNR)
1/3(FEC)    -1.2 db(SNR)
2/5(FEC)    0 db(SNR)
1/2(FEC)    1 db(SNR)
3/5(FEC)    2.2 db(SNR)
2/3(FEC)    3.1 db(SNR)
3/4(FEC)    4 db(SNR)
4/5(FEC)    4.6 db(SNR)
5/6(FEC)    5.2 db(SNR)
8/9(FEC)    6.2 db(SNR)
9/10(FEC)    6.5 db(SNR)
DVB-S2    8PSK    
3/5(FEC)    5.5 db(SNR)
2/3(FEC)    6.6 db(SNR)
3/4(FEC)    7.9 db(SNR)
5/6(FEC)    9.4 db(SNR)
8/9(FEC)    10.6 db(SNR)
9/10(FEC)     11 db(SNR)
DVB-S2    16APSK    
2/3(FEC)    9 db(SNR)
3/4(FEC)    10.2 db(SNR)
4/5(FEC)    11 db(SNR)
5/6(FEC)    11.6 db(SNR)
8/9(FEC)    12.9 db(SNR)
9/10(FEC)    13.1 db(SNR)
DVB-S2    32APSK    
3/4(FEC)    12.6 db(SNR)
4/5(FEC)    13.6 db(SNR)

[Lutz]

And do you have by chance a list of weak channels on these 3 satellites?

[el bandido]

No because I am in the United States. Really you do not need a list. Check the signal on each transponder of the satellite, then align to the weakest one. Usually when you make the weak transponder stronger, you will make all the transponders for that satellite stronger.