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what is the maximu symbol rate achieve when using Pluto sdr
Posted: Thu Oct 01, 2020 12:52 pm
by mamdo
Hi every one
i see in Portsdown4 there are Pluto sdr option. i need to know what is the maximum symbol rate can achieve .
also i'm just searching in source code but i cant find any thing relate to iio library except the "apt install iio". how the code can change parameter and pass data to pluto without using iio library.
thanks.
Re: what is the maximu symbol rate achieve when using Pluto sdr
Posted: Thu Oct 01, 2020 1:21 pm
by G8GKQ
Hi
The maximum SR with the Pluto depends on the modulion and video source. I test the software at up to 1 MS QPSK (there is little justification for using any more bandwidth than that), but I have seen it work at 2MS with a Pi camera. Note that Pluto is H264-only on the Portsdown.
You need to load custom firmware on the Pluto to use it with the Portsdown. This firmware does not use libiio, it accepts an rtmp stream with parameters and transmits it as DATV. An example of the code that sends the stream is here:
https://github.com/BritishAmateurTelevi ... /a.sh#L575
Explained very well by F5UII here:
https://www.f5uii.net/en/transmit-datv- ... lutodvb/8/
Dave
Re: what is the maximu symbol rate achieve when using Pluto sdr
Posted: Thu Oct 01, 2020 1:42 pm
by mamdo
G8GKQ wrote: ↑Thu Oct 01, 2020 1:21 pm
Hi
The maximum SR with the Pluto depends on the modulion and video source. I test the software at up to 1 MS QPSK (there is little justification for using any more bandwidth than that), but I have seen it work at 2MS with a Pi camera. Note that Pluto is H264-only on the Portsdown.
You need to load custom firmware on the Pluto to use it with the Portsdown. This firmware does not use libiio, it accepts an rtmp stream with parameters and transmits it as DATV. An example of the code that sends the stream is here:
https://github.com/BritishAmateurTelevi ... /a.sh#L575
Explained very well by F5UII here:
https://www.f5uii.net/en/transmit-datv- ... lutodvb/8/
Dave
Thank you Dave for quick response.
i know the custom firmware on pluto. but as i know that firmware do QPSK modulation inside pluto not inside raspberry.
also i'm trying to use that firmware but always have latency.
viewtopic.php?f=69&t=6746&p=23512#p23512
if you have solution to this plz tell me.