Pluto 4ms

Discussion about this major DATV Project. See https://wiki.batc.org.uk/The_Portsdown_Transmitter
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M0PAI
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Joined: Mon Sep 12, 2022 11:09 am

Pluto 4ms

Post by M0PAI » Sat Mar 25, 2023 2:48 pm

Does the pluto PD4 work 4ms symbol rate to use on 23cm repeaters?

G8GKQ
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Re: Pluto 4ms

Post by G8GKQ » Sat Mar 25, 2023 3:14 pm

I have just tested a Portsdown 4 with a USB-connected Pluto, and it will not transmit 4MS H264 FEC 1/2 DVB-S2. It was designed for much narrower signals.

However, to my surprise, it does work with 4MS H264 FEC 1/2 DVB-S. So you should be OK as long as the repeater accepts H264 video.

Dave, G8GKQ

M0PAI
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Re: Pluto 4ms

Post by M0PAI » Sat Mar 25, 2023 3:48 pm

Thanks Dave,
The repeater I want to try is GB3UD, how do I check if it accepts it or is it just a case of try?

Someone on the FB group mentioned a modulator board for the PD but not sure what that does.

Cheers
Adrian

G8GKQ
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Re: Pluto 4ms

Post by G8GKQ » Sat Mar 25, 2023 4:08 pm

Adrian

Just try!

The Portsdown 2020 would use a Filter-modulator board together with an ADF4351-based local oscialltor to generate 4MS DVB-S signals before the software to drive SDRs such as the Lime and Pluto was widely available. However, you clearly have a Portsdown 4 which is not compatible with the Filter-modulator board.

Dave

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