Portsdown 4 with Pluto

Discussion about this major DATV Project. See https://wiki.batc.org.uk/The_Portsdown_Transmitter
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VK3IE
Posts: 37
Joined: Thu Aug 13, 2020 10:57 am

Portsdown 4 with Pluto

Post by VK3IE » Tue Aug 25, 2020 9:38 pm

What are the current limitations of the Pluto as compared to the Lime.
Current new Firmware with Lime working well (local setup) Just do a new SD saves a lot of weird stuff from happening.
Not seeing many Setup\FAQ on using Pluto with Portsdown
Thanks

G8GKQ
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Posts: 2814
Joined: Sun Mar 22, 2009 1:21 pm

Re: Portsdown 4 with Pluto

Post by G8GKQ » Wed Aug 26, 2020 3:01 pm

The Pluto modes are still somewhat experimental in the Portsdown - hence the lack of documentation.

The Pluto modes are:
  • H264 only. No MPEG-2 or H265
  • 4:3 SD or basic 16:9 only. No 720p or 1080p
  • You can set and store (for each band) Pluto relative power on a range of 0 to -71. This approximates to dBm, but is plus or minus 10 dB.
  • I have seen it work well on symbol rates between 125 and 1000 kS.
  • DVB-S or DVB-S2
  • Video source Pi Cam, Comp Video, C920, Test card or Contest.
  • Pluto and RPi GPIO PTT switching implemented, but the test card mode overuns after deselction of transmission
  • Only tested with F5OEO's "for the brave" Pluto firmware (FIRM2101RC of 5 February 2020) .
Dave, G8GKQ

VK3IE
Posts: 37
Joined: Thu Aug 13, 2020 10:57 am

Re: Portsdown 4 with Pluto

Post by VK3IE » Wed Aug 26, 2020 11:13 pm

Thanks, now I have a feel of what to look for.

Lime is working 4 ks and upwards locally real well.
Just need to get some AMPS happening (watts) for vk3rtv

Cheers

F4DVK
Posts: 43
Joined: Mon Nov 27, 2017 6:24 pm

Re: Portsdown 4 with Pluto

Post by F4DVK » Thu Aug 27, 2020 4:50 am

Hello,

Dave,
Have you tested in DVBS with a 5/6 or 7/8 FEC?

Thank you,
Stephane.

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