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adm222

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Posts: 207
Reply with quote  #31 
I bought the LNB from the place in Canada where I got the Shaw receiver. I also had to buy one for the F2 stations on a seperate dish and a bunch of signal slplitters. I have a dual tuner receiver and there wre two cabels coming inside. each has a spltter on it near the end of the run one goes to a 30 inch dish pinted at F2 and teh other goes to a 4 foot dish pointed at F1 and G! G1 is much weaker. The LNBS look the same other than the fact that the one for G1 has red on it.

I used to have Bell, but several years ago they tightened their signal so it would not hit much of the US at all. I switched to Shaw and at that time I got a Dsih that was G1 ready, however when G1 came online the signal was very weak and only occasionally would register. So went with the bigger 2 dish set up. The F1 and F2 stations are a lot less rain fade then they were before. Frrom what I understand if I was much firther south / west of where I am now there would be almost no g1 signal no matter how big the dish is.
Captain_Kurtz

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Posts: 2,384
Reply with quote  #32 
Do you know the make & model of the LNB on your 4' G1 dish?
wejones

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Reply with quote  #33 
Quote:
Originally Posted by Mr_Uplink

Quote:
:
Originally Posted by wejones


I'm starting to remember now from back a couple years ago, and that is that there is one transponder that is different from the others, and that is the 11683 H.  The difference is that it seems to have the structure of an ATSC channel while the other ones are DCII structure.  Perhaps those channels or of a type that might be fed to OTA stations??

It's still a DC2 structured transponder.  The only difference between it and the others on G1, is the symbol rate and FEC.  It uses 20.5Ms 2/3 vs the others which are 22Ms 8/9. [cool]


I don't agree with this statement. To me, the only thing in common is the fact that this and the other transponders all use GI encryption.   I captured some images, and made a small web page to explain why I think this is the case at:
http://www.eskerridge.com/bj/sat/dcii-atsc.htm

But to summarize:
All the other transponders have the same basic DCII structure, ie in addition to the PAT and PMTs, they all have CDT, MMT, TDT, SIT, and CAT.  Despite them all having the same names as the structural items of traditional DCII, most of these items don't seem to be even used.  For example the MMT usually has a list of possible SRs, and when you click on one of the SR entries, it shows the SR, FEC and other parameters.  In the G1 DCII transponders, it does list various SRs, but when you click on them, the contents seem to be bogus info left over from traditional DCII, like 19510 3/4 , 29270 7/8, etc, etc.  Most of those other structural items are similar, with the exception of the CAT, which specifies GI encryption.  
   Now, with respect to the 11683 transponder, that transponder does not have the CDT, MMT, TDT, SIT, and CAT items at all.  It does have the CAT specifying GI encryption however.  Instead, 11683 has RRT, SST, MGT, TVCT, and EIT/ETT typical of ATSC muxes.  Also, if you click on the TVCT item, it specifies that the signal type is ATSC. Also if you click on EIT/ETT, it also specifies ATSC.  
  So it seems like the only similarity between the 11683 and the other G1 transponders is that they all use DCII encryption.
   My TSREADER display for this mux doesn't list the channel names, however it does say that the mux is TVO, which I assume to be TV Ontario, a network similar to PBS which apparently is broadcast OTA in Ontario, so perhaps that is why the content of the transponder is in ATSC structure.  

 There are/were other examples of sat signals being sent in ATSC format.  The LPB mux on SES-2 is also in ATSC mode, and I'm pretty sure that Oklahoma PBS used to be in ATSC mode before it left sat.
         
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Fellow Members, your posts are welcome here! Do not worry about posting everything perfect. Different receivers and LNB's will give you different Frequencies and Symbol Rates. Some set top boxes, PCI cards and USB receivers, Do Not Require all of the same information that others may need. It is not Required to post everything that others may need to tune in a feed. It is just most important to share the find. We can always adjust the Frequency and Symbol Rates and try the various Modulations and FEC's on our own receivers until we get a lock and then give a polite reply with what works for your receiver, as that information might help others as well. We all appreciate the efforts and energy of the Posters!

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