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	Gofastmotorsports > Categories > Computer and USB Satellite Receivers and Recording > ? multi input stream ?	Welcome, Private Messages: Unread

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View Member Profile Send Email Find Member's Topics Find Member's Posts wejones Registered:1199982923 Posts: 5,576	Posted 1312557480 Reply with quote  #1  I just ran into an interesting transponder, that reminded me that I had a few questions about things that were confusing me. Anyway, with my 6925, I ran into a transponder on AnikF3 3754 H 17692 With Crazyscan, it comes up as a DVB-S2 QPSK, even though it is obviously an 8PSK from the constellation diagram.   It is also an ACM/VCM mode transponder, and it is a Multi stream (3) transponder.  The constellation diagram is one of those similar to one I posted before, which I think was the NOAAPORT transponder, whereby, the 1:30 spot of the 8 phases is getting 90% of the hits, so I am still curious about that.  It does suggest that there are a lot of the same bit being transmitted, so I looked at the 3 streams in TSREADER.  Each of the 3 streams had multiple PIDs containing IP/DVB type data, but interestingly NONE of the 3 streams had a NULL stream, which I thought might account for multiple copies of the same bit.   Anyway, the constellation diagram is interesting.    I also am curious relative to just what is the difference between ACM and VCM? I think think that the combination of ACM and VCM dynamically vary parameters like FEC modulation mode (QPSK/8PSK. etc), and possibly vary the number of bytes in a frame or something like that, but was curious relative to specifically which did what.  I assume that this transponder must be switching between QPSK and 8PSK since the card ID'd it as QPSK when there are 8 spots, and it must be varying the FEC since it didn't ID a FEC. However my real curiosity this time, is just what is this MULTI Input Stream thing???    As you see from the attachment,  this one has 3 streams.  Each stream has multiple PIDs, each PID with IP/DVB data.  Looking at the various PIDs, it looks like none of the PIDs are duplicated in the 3 streams, so all of these PIDs could exist within a single stream. Since I'm tuned to a single transponder, what differentiates the different streams, and what is the advantage of separating the PIDs into separate streams?   I thought that maybe this really is NOT 8PSK, but instead two different QPSK signals, offset by 45 degrees, and perhaps that spot with all the hits is some kind of a sync to ID it, however this would only explain having 2 streams, not 3.    Anyway, I'm curious.  Just what differentiates the different streams, and WHY is there any advantage to doing this???    Attached Images
View Member Profile Send Email Find Member's Topics Find Member's Posts crazycat Registered:1299364124 Posts: 1,020	Posted 1312562363 Reply with quote  #2  @wejones ACM and VCM is same on your side. DVB-S2 stream can contain BBFrames with diffrent modcode (FEC) or dummy frames (big spot at PI/4). BlindScan in this case show modcode (modulation+FEC) from some one frame (in your case this dummy frame, but modulation info incorrect and i must fix it). P.S. More info about real application for advanced DVB-S2 you can read on Newtec website. Most interest - DVB-S2 Multistream for DTT distribution and FlexACM networking __________________ Strong offset dish 0.95m on Powertech DG240 motor + ALPS BSTE8-751B Ku-Universal LNB. Variant CA-902 0.95 offset dish with 3xDreamSat DS-8 Ku-Universal LNBs (13E+4.8E+4W) + Variant CA-600 Ku-Circular LNB 36E + DiseqC 1.0. STB: GI8120 Lite. PC DVB: Omicom S2 PCI; TBS 6983 PCI; TBS QBox-CI USB(5980), 5927.
View Member Profile Send Email Find Member's Topics Find Member's Posts wejones Registered:1199982923 Posts: 5,576	Posted 1312570777 Reply with quote  #3  Thanks for the info and links.  I'll have to do some more reading.
View Member Profile Find Member's Topics Find Member's Posts starman345 Registered:1193615332 Posts: 640	Posted 1312578121 Reply with quote  #4  Occasionally this one scans in as QPSK for me but most of the time its 8PSK Around 40Mbits bitrate total. You are finding some very interesting signals wejones Thanks! __________________ 10' c/ku, Bullseye II Gbox 3000 90cm ku, SG-2100 Prof 7301 PCI TBS 8922 PCI TBS 6925 PCI-E
View Member Profile Send Email Find Member's Topics Find Member's Posts crazycat Registered:1299364124 Posts: 1,020	Posted 1312596523 Reply with quote  #5  with latest test StreamReaderEx must show as ? in modulation and ?/? in FEC. But some times real 8PSK BBframes will be catched and show real mudulation and FEC (8PSK and FEC from 3/4). P.S. This is real multistream at 31.5E with one substream 2, which contain one test italian DVB-T mux Tivuitalia. But ~80% transponder capacity is empty and filled with dummy BBFrames (big spot @ PI/4). __________________ Strong offset dish 0.95m on Powertech DG240 motor + ALPS BSTE8-751B Ku-Universal LNB. Variant CA-902 0.95 offset dish with 3xDreamSat DS-8 Ku-Universal LNBs (13E+4.8E+4W) + Variant CA-600 Ku-Circular LNB 36E + DiseqC 1.0. STB: GI8120 Lite. PC DVB: Omicom S2 PCI; TBS 6983 PCI; TBS QBox-CI USB(5980), 5927.

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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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