[mythtvnz] Skystar2 group order?
Steve Hodge
mythtvnz@lists.linuxnut.co.nz
Wed, 9 May 2007 14:31:47 +1200
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On 5/9/07, Craig Whitmore <lennon@orcon.net.nz> wrote:
>
> Reading the net I seem to have a newer LNB on the Sky Dish which is
> pointing towards 2 satellites at once?. (Optus B1 and Optus D1) which is
> changed depending on What the Sat Card sends (how is this changed?)
I believe it's changed based on the presence or absence of a 22kHz tone
generated by the card (or the Sky box). You should be able to use the -tone
argument with dvbtune to select the satellite but I don't have one of those
LNBs so I haven't done this.
And I can pick up the freeview NZ via
> dvbstream -f 1173 -s 22500 -p h -o 512 650 for example
>
> How does the 1173000 correspond to the 12456000 Freq which is listed on
> http://www.lyngsat.com/optusd1.html?? And why if I have a older card I
> have to use 1183? 50 Different??
The purpose of an LNB is to reduce the frequency of the signal from the
satellite from something that it convienient to transmit over the air (
12.456GHz in this case) to something that is convienient to transmit via
cables (1.156 GHz, for example). LNBs generally have one or two fixed
offsets that they adjust the frequency by. In the case of the old Sky LNBs
there was a single offset of 11.3GHz: 12.456GHz-11.3GHz = 1156MHz. Note that
1183MHz is the adjusted (L-band) frequency of Canwest's
12.483GHztransponder, not TVNZ's
12.456GHz transpoder.
So, if 1173MHz gets you TVNZ's transponder with your current LNB then the
LNB's offset must be 12.456GHz-1.173GHz = 11.283GHz and Canwest's
transponder should appear at 12.483GHz-11.283GHz = 1200MHz. However if
1173MHz is what you get Canwest on then your LNB has an offset of
11.31GHzand TVNZ should appear on 1146MHz.
and If I wanted to pick up other unencypted DVB streams from this page?
> How could I do it? (and what ones off this sat are pointing towards NZ?
> which I could pick up with the same dish?
On the Lyngsat page the "Beam" column tells you whether the signal can be
received from New Zealand. The "Video Encryption" column tells you if you
can view the signal or not. You'll see that Sky's channels mention
Videoguard but Freeview's just say "DVB". Once you know the offset of your
LNB you can take the frequency (which is in MHz) and subtract the LNB offset
to arrive at the frequency to use with dvbtune and dvbstream. The frequency
column also tells you whether the signal uses horizontal or vertical
polarisation.
Cheers,
Steve
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On 5/9/07, <b class="gmail_sendername">Craig Whitmore</b> <<a href="mailto:lennon@orcon.net.nz">lennon@orcon.net.nz</a>> wrote:<div><span class="gmail_quote"></span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
Reading the net I seem to have a newer LNB on the Sky Dish which is<br>pointing towards 2 satellites at once?. (Optus B1 and Optus D1) which is<br>changed depending on What the Sat Card sends (how is this changed?)</blockquote>
<div><br>I believe it's changed based on the presence or absence of a 22kHz tone generated by the card (or the Sky box). You should be able to use the -tone argument with dvbtune to select the satellite but I don't have one of those LNBs so I haven't done this.
<br></div><br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">And I can pick up the freeview NZ via<br>dvbstream -f 1173 -s 22500 -p h -o 512 650 for example
<br><br>How does the 1173000 correspond to the 12456000 Freq which is listed on<br><a href="http://www.lyngsat.com/optusd1.html">http://www.lyngsat.com/optusd1.html</a>?? And why if I have a older card I<br>have to use 1183? 50 Different??
</blockquote><div><br>The purpose of an LNB is to reduce the frequency of the signal from the satellite from something that it convienient to transmit over the air (12.456GHz in this case) to something that is convienient to transmit via cables (
1.156 GHz, for example). LNBs generally have one or two fixed offsets that they adjust the frequency by. In the case of the old Sky LNBs there was a single offset of 11.3GHz: 12.456GHz-11.3GHz = 1156MHz. Note that 1183MHz is the adjusted (L-band) frequency of Canwest's
12.483GHz transponder, not TVNZ's 12.456GHz transpoder.<br></div><br>So, if 1173MHz gets you TVNZ's transponder with your current LNB then the LNB's offset must be 12.456GHz-1.173GHz = 11.283GHz and Canwest's transponder should appear at
12.483GHz-11.283GHz = 1200MHz. However if 1173MHz is what you get Canwest on then your LNB has an offset of 11.31GHz and TVNZ should appear on 1146MHz.<br><br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
and If I wanted to pick up other unencypted DVB streams from this page?<br>How could I do it? (and what ones off this sat are pointing towards NZ?<br>which I could pick up with the same dish?</blockquote><div><br>On the Lyngsat page the "Beam" column tells you whether the signal can be received from New Zealand. The "Video Encryption" column tells you if you can view the signal or not. You'll see that Sky's channels mention Videoguard but Freeview's just say "DVB". Once you know the offset of your LNB you can take the frequency (which is in MHz) and subtract the LNB offset to arrive at the frequency to use with dvbtune and dvbstream. The frequency column also tells you whether the signal uses horizontal or vertical polarisation.
<br><br>Cheers,<br>Steve<br></div></div>
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