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English => Sundtek SkyTV Ultimate => Thema gestartet von: Tryon am Februar 09, 2017, 10:42:29 Nachmittag

Titel: Unknown modulation?
Beitrag von: Tryon am Februar 09, 2017, 10:42:29 Nachmittag
Hi,

I know this is unlikely, but some users may encounter undefined modulation in blindscan.
Read signal should display 8-PSK and 16-APSK(although real property names are PSK_8 and APSK_16).

Best part in all this is that somehow it is possible to receive such broadcasts in Tvheadend. 8)

Thanks.
Titel: Re:Unknown modulation?
Beitrag von: Sundtek am Februar 10, 2017, 12:27:33 Vormittag
Where do you see unknown modulation?

Can you put a screenshot online?

Our blindscan does not have unknown modulation implemented as far as I see.
Titel: Re:Unknown modulation?
Beitrag von: Tryon am Februar 11, 2017, 08:13:29 Nachmittag
Thanks. I will wait for next opportunity. In any case, tool will not recognize 16-APSK.
Manual tuning also can be expanded -M modulation (QPSK, 8PSK,...)
Titel: Re:Unknown modulation?
Beitrag von: Tryon am Februar 19, 2017, 03:59:53 Nachmittag
FEC: FEC_AUTO MOD: UNKNOWN VOLTAGE: V(13V) TONE: ONCan we have POL: V instead of voltage?

It is also interesting to read research article about DVB-S2X:
Zitat von: Development of satellite high-definition television in Europe
In order to ensure transmission of the greatest possible number of HDTV and UHDTV channels via satellites, it is necessary to convert the satellite DVB-S transponders to DVB-S2 transponders. Conversion to the 16APSK modulation will result in the increased capacity for HDTV channels. Furthermore, in order to use satellite capacity as cost effectively as possible, the MPEG-4 compression standard should also be used for the transmission of SDTV channels.