Originally posted by talosman
dubbadon, if my decoder support all 18 standards, shouldn't that work? I think it may have to do with my antenna set up.... or locations? too many variables right now.....
Unfortunately that is not how DTV works. Not only do you have to have a signal to decode, you need to have the the PSIP data configured correctly for the receiver to reassemble the different pieces into a usable signal.
Trust me, to go into all the of nuances of PSIP is WAY beyond this thread! If you really want to tackle this, the Sarnoff website has about the best technical explanation of how PSIP works of any I have seen. It is still very technical, but if you understand streaming, you might glean some stuff from it.
Now having said that, some first generation DTV receivers, the DTC-100 and its variants are 1st generation receivers, work on a slightly different PSIP protocol that was in use at that time of manufacture. The PSIP protocol has been updated twice since then and the DTC-100's require PSIP data to decode a station correctly. If a station is not transmitting any PSIP data, then the receiver doesn't know how to reassemble the signal so it ignores it. Later versions of the PSIP protocol have other ways of determining the correct sequence and so they will decode stations with no PSIP data (like WXII). But if the PSIP data is misconfigured, you will have all kinds of funny things happen, like video from one stream with audio from another stream, or if you have two stations and they have the TSID incorrectly configured (the TSID is a unique ID number for each station in the country that the MSTV organization has assigned and is trying to get the FCC to recognize it) and if it is set to 1 or 0 or the same as another station your area, when you go to station WXXX, your receiver will go to station WYYY instead because it looks to see how the PSIPs match the TSID. For instance, WGHP's TSID for channel 8 is 1832 and for channel 35 is 1833. This tells the receiver that TSID 1833 is the digital channel for High Point, NC. TSID 1 is for a station in Alaska! It gets confusing!
As of today, best I can tell, all stations that I can receiver, all locals anyway, are transmitting some form of PSIP except WXII. I see that WXLV and WUPN have reconfigured PSIP from their actual DTV channels (29, 33) to their remapped analog channels (45, 48) but now all I get is WUPN's HD stream (48-2) which shows nothing but color bars all the time.(48-1 is their regular SD channel which my Samsung is not decoding now) But that is better than before, I used to get nothing at all on 48 (33)! So Gil is working on it! The professional DTV demod at work will decode both WUPN streams, but I have to force it to do that.
NAB has reported that 80% of all DTV problems these days are due to misconfigured PSIP because engineers do not understand it. I know I don't as well as I should. I am trying, but it is a HUGE learning curve. We will get there! (PSIP will be the death of all the engineers! I am positive of it!)
I got more in depth than I intended to, but as you can see, it isn't as straight forward as it looks.
Hope that helps!