Hello group, I am having problems getting a PBI DCH-2000EC MPEG-2 encoder to operate correctly with a DMV system 3000 MPEG-2 modulator via RS 422 parrallel. I know it is not a problem with the modulator as it operates OK when using a different MPEG-2 transport stream from an Alteia professional grade QPSK satellite receiver (with a bitrate of 33.75 MB/sec from an active satellite mux). When i swap to the PBI transport stream & adjust the modulators receive bitrate to the PBI's output bitrate (in this case 10.799 MB/sec, which we know to be correct from using a Rhode & Shwartz transport stream processor), the modulator recognises the clock & phase locks to it - but, there is no frame lock & input lock. Even though the encoder has ASI & SPI RS422 (DB25) outputs, the ex TVNZ modulator only has SPI RS422 (DB25) input. My question is: Is there a difference between the two transport streams - is there something missing from the PBI's transport stream that is required by the DMV modulator to lock correctly? (PMT or PAT tables for instance). Does the PBI encoder require a multiplexer which inserts extra data information, maybe. I know there is a valid transport stream coming out of the PBI encoder as i can receive & decode it via my Promax P4+C spectrum analyser which has an RS 422 parrallel TS input (DB 25) & QPSK card. This is also the case with the transport stream from the Alteia sat receiver. I am quickly running out of options - Can you please help. Any advise would be much appreciated. Kindest Regards Steve Johnson Satcom (NZ) Limited Pukekohe, Sth Auckland, NZ
MPEG-2 encoding/modulation problem
Started by ●January 11, 2006
Reply by ●January 11, 20062006-01-11
I know there is a valid transport stream coming out of the PBI encoder as i can receive & decode it via my Promax P4+C spectrum analyser which has an RS 422 parrallel TS input (DB 25) & QPSK card. Did you mean Transport stream analyzer???? You might also post in the sci.engr.television groups.... Mark
Reply by ●January 11, 20062006-01-11
>I know there is a valid transport stream coming out of the PBI encoder >as >i can receive & decode it via my Promax P4+C spectrum analyser which >has >an RS 422 parrallel TS input (DB 25) & QPSK card. > >Did you mean Transport stream analyzer???? > >You might also post in the sci.engr.television groups.... > >Mark > >Thanks Mark, We used a Rhode & Shwartz TS analyser to ascertain the true bit rate coming out of the PBI encoder (10.799 MB/sec). We then fed the same transport stream into a Promax P4+C RF spectrum analyser which also has TS input. The Promax doesn't analyse the TS as such - it is able to receive the TS (SPI DVB)using a DB25 input connector. Using an inbuilt QPSK card, it is able to demodulate the TS to audio/video on the built in colour LCD screen. We can also do this with the 33.75 MB/sec TS from a satellite mux. So,it makes me wonder what is different between the two transport streams that the DMV system 3000 modulator doesn't like. Thanks Steve Johnson