Change to digital output

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GW8PBX
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Joined: Tue Apr 01, 2008 8:56 am

Change to digital output

Post by GW8PBX » Thu Feb 09, 2012 9:53 pm

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

G4EWJ
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Joined: Wed Feb 17, 2010 10:11 am

Re: Change to digital output

Post by G4EWJ » Tue Mar 18, 2014 12:36 am

What are the current inputs to GB3TM please?

Brian

GW8PBX
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Joined: Tue Apr 01, 2008 8:56 am

Re: Change to digital output

Post by GW8PBX » Tue May 06, 2014 4:14 pm

Sorry, Brian - I have only just spoptted this post

1249MHz analogue input
437MHz digital input

David
GW8PBX

G4EWJ
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Re: Change to digital output

Post by G4EWJ » Tue May 06, 2014 8:22 pm

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

GW8PBX
Posts: 9
Joined: Tue Apr 01, 2008 8:56 am

Re: Change to digital output

Post by GW8PBX » Wed May 07, 2014 2:19 pm

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

G4EWJ
Posts: 670
Joined: Wed Feb 17, 2010 10:11 am

Re: Change to digital output

Post by G4EWJ » Wed May 07, 2014 5:09 pm

Thanks.

Brian

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