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allstarnz

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#25788 1-Sep-2008 17:25
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So does anyone know what the transponder frequency and symbol rates of the transponders Sky are using for their HD service?

Also, are they DVB-S1 or DVB-S2.

thanks

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openmedia
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  #161354 1-Sep-2008 18:51
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They have two HD half transponders both running DVB-S2

12331 H 22500 2/3
12358 H 22500 2/3

Steve




Generally known online as OpenMedia, now working for Red Hat APAC as a Technology Evangelist and Portfolio Architect. Still playing with MythTV and digital media on the side.


 
 
 

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allstarnz

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  #161429 1-Sep-2008 23:37
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thanks!!

allstarnz

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  #161492 2-Sep-2008 11:29
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further to this, has anyone with a DVB-S2 card managed to get lock and tune on these transponders?




eXDee
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  #161613 2-Sep-2008 16:49
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Also interested in this, though you need someone with a 45xx card, card reader, mysky HDi, dvb-s2 card and sky working to test it. Anyone match all of these criteria?

mruane
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  #161664 2-Sep-2008 19:18
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I have just tried to scan those frequencies with a HVR4000 DVB-S2 card and cannot get a lock. Is the 2/3 FEC rate correct?

Cheers Mike

allstarnz

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  #161697 2-Sep-2008 21:53
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eXDee: Also interested in this, though you need someone with a 45xx card, card reader, mysky HDi, dvb-s2 card and sky working to test it. Anyone match all of these criteria?


one would think that even without the cards, you should be able to get lock on the transponder and see the channels.  Decoding them is an entirely different matter.

Also, even if the PIDs and what have you are hidden, you should still be able to get lock on those transponders I would have thought.  You'd just scan and get no services on them.

eXDee
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  #161698 2-Sep-2008 22:03
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By 'lock and tune' i assumed you meant getting a picture. But yes you could get a lock with just the card i suppose.



openmedia
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  #161707 2-Sep-2008 23:07
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mruane: I have just tried to scan those frequencies with a HVR4000 DVB-S2 card and cannot get a lock. Is the 2/3 FEC rate correct?

Cheers Mike


I pulled the information out of Sky's NIT table

            Frequency: 19083520 (=  12.33100 GHz)
            Orbital_position: 5632 (= 160.0)
            West_East_flag: 1 (0x01)  [= EAST]
            Polarisation: 0 (0x00)  [= linear - horizontal]
            Kind: 1 (0x01)  [= DVB-S2]
            Roll Off Faktor: 2 (0x02)  [= Alpha 0.20]
            Modulation_type: 2 (0x02)  [= 8PSK]
            Symbol_rate: 2248704 (=  22.5000)
            FEC_inner: 2 (0x02)  [= 2/3 conv. code rate]




Generally known online as OpenMedia, now working for Red Hat APAC as a Technology Evangelist and Portfolio Architect. Still playing with MythTV and digital media on the side.


allstarnz

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  #161712 2-Sep-2008 23:29
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eXDee: By 'lock and tune' i assumed you meant getting a picture. But yes you could get a lock with just the card i suppose.


sorry I should have been more clear.

step 1:  get lock on transponder
step 2:  tune in channels on that transponder (should be able to get this far with Sky)
step 3:  decode (if necessary) and watch tuned channels

Cool

I would imagine one should be able to get to step 2 with any DVB-S2 hardware, but it seems harder than it would seem for some reason.

djaggar
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  #161719 3-Sep-2008 00:12
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allstarnz:
eXDee: By 'lock and tune' i assumed you meant getting a picture. But yes you could get a lock with just the card i suppose.


sorry I should have been more clear.

step 1:  get lock on transponder
step 2:  tune in channels on that transponder (should be able to get this far with Sky)
step 3:  decode (if necessary) and watch tuned channels

Cool

I would imagine one should be able to get to step 2 with any DVB-S2 hardware, but it seems harder than it would seem for some reason.


MyTheatre 4.0 Beta & HVR4000 'locks & tunes' if you specify the FEC 2/3 & 8PSK explicitly rather than rely on the Auto feature (which works for DVB-S) - I believe that is expected behaviour of this recent beta release. GBPVR does not see them on a standard scan - I haven't looked why - nor have I tried to enter them manually.

So decode should be possible with a 45 sky card with a HD subscription.

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