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Change to digital output
Posted: Thu Feb 09, 2012 9:53 pm
by GW8PBX
FROM 1st MARCH 2012 GB3TM OUTPUT WILL BE DIGITAL ONLY using DVB-S on 1316MHz
The optional (switchable) analogue output will be disabled from this date.
The analogue INPUT remains unchanged at 1249MHz FM with 6MHz intercarrier sound.
GW8PBX - Repeater Keeper
Re: Change to digital output
Posted: Tue Mar 18, 2014 12:36 am
by G4EWJ
What are the current inputs to GB3TM please?
Brian
Re: Change to digital output
Posted: Tue May 06, 2014 4:14 pm
by GW8PBX
Sorry, Brian - I have only just spoptted this post
1249MHz analogue input
437MHz digital input
David
GW8PBX
Re: Change to digital output
Posted: Tue May 06, 2014 8:22 pm
by G4EWJ
Thanks. I assume the 437MHz input PIDs are the same as the 1249MHz output PIDs.
For the record, could you detail the symbol rates and PIDs used please: PMT,VIDEO,AUDIO,PCR.
Brian
Re: Change to digital output
Posted: Wed May 07, 2014 2:19 pm
by GW8PBX
Dangerous to assume anything with DATV!
We've had a HUGE amount of bother with PIDs from different DATV transmitters - all now thankfully resolved.
TX (1316MHz)is based on AGAF boards which are somewhat inflexible and have the following fixed parameters:
Video 33 (dec)
Audio 49 (dec)
PCR 33 (dec)
SR set at 4167 and FEC at 7/8
This presents no issues as person receiving has to do a scan anyway.
RX (437MHz)
Was a huge problem as most units (domestic) cannot receive different transmissions to different standards without rescanning. Impossible (almost) on a remote site.
Now with new RX problem has gone away, it will lock to anything - well almost! - see CQTV a few issues back for details.
Hope this helps
David GW8PBX
Re: Change to digital output
Posted: Wed May 07, 2014 5:09 pm
by G4EWJ
Thanks.
Brian