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Does the QPSK-8PSK setting do anything, in The Pansat 9200? Because in 2+yrs of use, I don't think it has, or does anything. It doesn't miss any 8PSK, if left set on QPSK. The only setting that matters is the DVB-S/S2 setting set to DVB-S2, to scan in the 8PSK transponders.The only thing I see the 8PSK setting do is put 8PSK in the channel info bar on bottom of screen.
Is that all it's for? Or am I missing some other feature or transponders. And If I am missing some feature or transponder, let me know of their location and a little info as to how to program them in the 9200. I'd be greatful. Thanks.
Assuming that you're now talking DVB-S2 QPSK or 8PSK, then I think I'd say that it SHOULD make a difference, and in some receivers it DOES make a difference. However some receivers have tuners that just don't seem to care what parameters you have set. My TT3200 will lock regardless of what FEC you set, and doesn't have a setting for QPSK or 8PSK. On the other hand, my other S2 receivers, (ie Diamond 9000, Coolsat 8100, Azbox Elite) need to be set on the proper parameters (it's been a while since I've used the Coolsat, so I'm not as positive about it, but I think so). The one exception is the Azbox has a tendency to sometimes lock on an illegal 7/8 FEC in both QPSK AND 8PSK mode. Otherwise though, if the transponder is QPSK, you must set it on QPSK, and if the transponder is 8PSK, you must set it on 8PSK.
There ARE some transponders that are in a dual mode, where they can be locked with either QPSK or 8PSK, but those are rare.
So anyway, I'm not familiar with the 9200, but from what you describe, it sounds similar to my TT3200, whereby it must use a tuner that must do DVB-S2 in some sort of automatic mode, where the settings don't matter.
BTW, with my TT3200, since it doesn't even have a QPSK/8PSK setting, it's difficult for me to report transponders I find with it, because I can't tell what the parameters are. I can sometimes tell by looking at the mux bitrate in TSREADER, which usually makes it pretty obvious whether it's QPSK or 8PSK, but often the bitrates aren't exact enough to determine the FEC. So if I find a feed and go to report it somewhere, I usually have to plug it into one of my other receivers to verify the parameters.
Back to the DVB 8PSK vs Trellis thing, it was always my impression (just from reading various forums) that the DVB spec didn't have 8PSK defined, and that perhaps Trellis is what it would have been if it was defined, but is really more of a proprietary spec, similar to the Turbo 8PSK. And I really get the impression that there are a LOT of these proprietary specs, or perhaps uplinkers who have set the parameters of there equipment in ways that don't comply with the normal DVB or DVB-S2 specs. There are many many transponders up there that are nice strong transponders that I can't lock in any mode. Many are regular QPSK, apparently close enough to DVB that I get a "signal lock", but they don't give a "data lock" on any of the standard FEC values. When I try to lock with my Broadlogic, I get a quick signal lock, and then I see it trying all the FEC values, one by one, over and over, and it doesn't find one that matches. So I'm guessing that these signals just aren't following the standard. Perhaps they have some non-standard value for the data size that's normally 188, or something like that. But I see all sorts of signals up there that for one reason or other can't be locked with any mode I can do, and I don't think they are all Trellis, as many are QPSK, so there must be ways to set the commercial equipment so that regular tuners won't lock them.
