BATC Net on QO-100

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g0mjw
Posts: 1451
Joined: Sat Sep 20, 2014 9:15 am

Re: BATC Net on QO-100

Post by g0mjw » Fri Jul 10, 2020 1:04 pm

I think I win the contest. I didn't see any other numbers and received a P5 001 report from Dave.

More seriously, with H265 it is possible to send much better quality pictures and the Portsdown, thanks to Dave's efforts, can now receive them. We send H264 to ensure everyone can receive it but who is it that can receive H264 but can't receive H265? I am aware older satellite receivers without HD capability can not, but to my knowledge these can't receive the 333ks signals either.

Mike

G4GUO
Posts: 667
Joined: Tue Feb 16, 2010 12:51 pm

Re: BATC Net on QO-100

Post by G4GUO » Fri Jul 10, 2020 2:11 pm

If there is a mixture of H.264/H.265 I won't bother posting the net to YouTube anymore as I would not be able to record the transport stream and then upload it to YouTube as YT can't cope with a mixed format stream.

- Charles

g0mjw
Posts: 1451
Joined: Sat Sep 20, 2014 9:15 am

Re: BATC Net on QO-100

Post by g0mjw » Fri Jul 10, 2020 6:35 pm

Wouldn't passing it through ffmpeg first fix that?

G4GUO
Posts: 667
Joined: Tue Feb 16, 2010 12:51 pm

Re: BATC Net on QO-100

Post by G4GUO » Sat Jul 11, 2020 7:40 am

No I tried that. What seems to happen is the first valid set of SI tables received are taken to be correct for the rest of the stream. The same applies with the sound.

I suspect some command line tools couls be written to parse the ts, correct the timestamps and sort the segments into formats but I don't have
the time or interest.

I am about to start coding some software for a brand new DATV-Express receive tuner unit so will be quite busy soon.

- Charles

g0mjw
Posts: 1451
Joined: Sat Sep 20, 2014 9:15 am

Re: BATC Net on QO-100

Post by g0mjw » Sat Jul 11, 2020 8:11 am

That's interesting. I will see if I can figure it out. Meanwhile, what's this new tuner?

Mike

G4GUO
Posts: 667
Joined: Tue Feb 16, 2010 12:51 pm

Re: BATC Net on QO-100

Post by G4GUO » Sat Jul 11, 2020 8:28 am

It is a combo tuner DVB-T/T2/S/S2 we finally found a manufacturer that will work with us.
First out the gate will be a narrowband DVB-T receiver, we already have modified firmware to
support that then we will move on to DVB-S/S2.

I should get the prototype in a few days so I can start the coding.

- Charles

g0mjw
Posts: 1451
Joined: Sat Sep 20, 2014 9:15 am

Re: BATC Net on QO-100

Post by g0mjw » Sat Jul 11, 2020 8:32 am

Brilliant. I look forward to seeing the results. NB-DVB-T would be great for 6m and 4m Es I think.

Mike

G4GUO
Posts: 667
Joined: Tue Feb 16, 2010 12:51 pm

Re: BATC Net on QO-100

Post by G4GUO » Sat Jul 11, 2020 8:42 am

The RF part in the DVB-T section goes down to 44 MHz according to the spec I have seen.

M0DTS
Posts: 462
Joined: Sun Feb 24, 2008 9:03 pm

Re: BATC Net on QO-100

Post by M0DTS » Sat Jul 11, 2020 7:15 pm

How narrow DVB-T are we talking then?!

Watching with interest :-)

Rob

G4GUO
Posts: 667
Joined: Tue Feb 16, 2010 12:51 pm

Re: BATC Net on QO-100

Post by G4GUO » Sat Jul 11, 2020 7:41 pm

1 MHz but I know which (clock) variable in the firmware needs changing to get the reduced bandwidth so it might
work at lower bandwidths but until I have some working code I can't give a definitive answer.

- Charles

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