News from a 28e revenant :O)

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rodscha

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Nalleman said:
Labour won't stop the change to a new technique even if it's makes it harder for those outside the intended coverage area to watch the programs intended for the UK.
Click to expand...
ok sorry then...We hope we get an affordable pay offer in this case!
 
Pride Of Cucamonga

Pride Of Cucamonga

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Nalleman said:
Look in the table I posted. There you can see the difference in C/N needed to get a picture depending on which technique used.
The strength of the transmitted signal is the same but the signal needed for the receiver to produce a picture is higher when using 8PSK.
Click to expand...
that's interesting, so DVBS2 QPSK is actually more robust than DVBS at the same FEC
 
ocean04

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Fisty McB said:
converted from DVB-S FEC-5/6 to DVB-S2 8PSK FEC-2/3. The SNR required for the former is 6.5db while the latter is 6.6db - essentially no real difference as far as reception goes.
Click to expand...
That's not true. SNR required for DVB-S FEC-5/6 is 5.1db. DVB-S2 8PSK FEC-2/3 it is 6.6db. Difference 1.5.
Correct table is here: The Effect of FEC - BATC Wiki

12383H was fine here when it was DVB-S 5/6, but now it requires 1.5db more and only works later in the evening / night..
 
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Pride Of Cucamonga said:
that's interesting, so DVBS2 QPSK is actually more robust than DVBS at the same FEC
Click to expand...
There seems to be different opinions according to the table I found and the one ocean04 linked to in his answer above.
However even in that table DVB-S2 QPSK seems to be a bit "friendlier" than DVB-S.
 
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Nalleman

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ocean04 said:
That's not true. SNR required for DVB-S FEC-5/6 is 5.1db. DVB-S2 8PSK FEC-2/3 it is 6.6db. Difference 1.5.
Correct table is here: The Effect of FEC - BATC Wiki

12383H was fine here when it was DVB-S 5/6, but now it requires 1.5db more and only works later in the evening / night..
Click to expand...
It seems 1,5 dB more is too much since I still get 12382 without problems.
The limit here was around 6,8 dB when in DVB-S 5/6.
Now I have 7,7 dB and the reception is fine with a difference of 0,9 dB.
Don't know where the limit is with the new parameters yet.
 
ocean04

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Nalleman said:
The limit here was around 6,8 dB when in DVB-S 5/6.
Click to expand...
Where do you get that value from? db value is displayed incorrectly in most receivers. VU+ db value you can't trust at all.
SF8008 (silabs) should be good. You can check 12129V DVB-S 5/6, lock should be around 5.0 - 5.2 in SF8008
 
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Nalleman

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ocean04 said:
Where do you get that value from? db value is displayed incorrectly in most receivers. VU+ db value you can't trust at all.
SF8008 (silabs) should be good. You can check 12129V DVB-S 5/6, lock should be around 5.0 - 5.2 in SF8008
Click to expand...
Will try my SF8008 which has a much less sensitive tuner than the VU+ DUO 4K SE tomorrow.
With the Octagon I can't get 11053 H 24/7. With the VU+ I get it unless it rains heavily.

As for 12382 H I can simply use the percentage shown in the VU+ DUO2/DUO 4K SE.
On the DUO 2 when DVB-S 5/6 the picture started to break up at around 42 %.
The value now is 46 % (was 48 % when I wrote my previous post) on the DUO2 due to rain and the picture is stable.

On the 4K SE when DVB-S 5/6 the picture started to break up at 38 %. When DVB-S2 8PSK and FEC 2/3 the break up starts at 42 % (has seen this on 12168 V, 12226 H and 12363 V).
A difference of only 4 percent can't be equivalent to 1,5 dB.
 
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