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Re: ADALM-PLUTO (new DATV SDR)

Posted: Sun Jun 30, 2019 11:42 am
by g8lce
Check the power you are feeding to the power amp. It could be upsetting the usb power. I had the usb input board of a Minitioune blow when a power supply I used was not very nice!!! Earths are not always what they seem!!!

Martin G8LCE.

Re: ADALM-PLUTO (new DATV SDR)

Posted: Wed Jul 03, 2019 7:24 am
by radiogareth
I find the Pluto is very sensitive to usb wobbles and earth loops. Works fine on its own, as soon as I connect other things on other PSUs I get connects/disconnects.
No solution as yet other than to use portable laptop on battery.
Gareth

Re: ADALM-PLUTO (new DATV SDR)

Posted: Thu Jul 11, 2019 9:47 am
by g7jfi
Hi Gareth.
The problem has been fixed by one user.

https://www.eevblog.com/forum/rf-microw ... to-sdr/25/

Look about 2/3 down the page. You can search the page for his user name "Taucher" to take you to the relevant post.

Hope this helps. I'll be modding mine as soon as the warranty is out as I have same problem, but it is not too intrusive at the minute as I seldom disconnect the Tx port while it is in use.

Terry G7JFI

Re: ADALM-PLUTO (new DATV SDR)

Posted: Tue Jul 23, 2019 1:36 pm
by radiogareth
Thanks Terry. I have had a close look at that diagram. Seems all I need to do is bridge the ground side of the bifilar choke to achieve the same thing. Diagram isn't wonderfully clear but adding what would be several cms of wire surely isn't 'good RF practice'? Seat of pants feeling here.....
I'll try it on one of mine and see if it behaves any better.
Gareth

Re: ADALM-PLUTO (new DATV SDR)

Posted: Sat Jul 27, 2019 8:47 am
by radiogareth
Meanwhile over on the FB ADALM Pluto user group this was posted....

Pavel Husák
14 hrs
Hello to all PlutoSDR owners,

I have replaced internal oscillator in Pluto. I have used ASTX-13-C-40.000MHz-I05-T. Pluto is more stable then before and I am able to make SSB qso now without drifting. No need GPS stabilisation I think.

I have had no experience with SMD removing from PCB, so change was little bit dramatical, but I have done it and Pluto works.

Now is Pluto fully usable for QO-100.

Thanks to Mathias DL9BQ for usable informations - look at his qrz.com pages.

Have a nice day de Pavel OK1PHU

Mouser UK have them in abundance :-)

Re: ADALM-PLUTO (new DATV SDR)

Posted: Sat Jul 27, 2019 11:25 am
by radiogareth
And a bit more info here (translate as required).

https://www.f1te.org/index.php/realisat ... dalm-pluto

Don't like Mousers £12 delivery charge though!!

Gareth

Re: ADALM-PLUTO (new DATV SDR)

Posted: Sun Aug 11, 2019 6:23 am
by on8ge
New firmware 0.31 has been released. Pluto don't work anymore with DATV Expres SW here, any idea ?

Re: ADALM-PLUTO (new DATV SDR)

Posted: Tue Oct 01, 2019 8:32 pm
by M5TXJ
Just spotted this on Twitter, it seems there may be hope for those of us with a Pluto yet? Not sure of the background to the tweet but looks interesting.

Re: ADALM-PLUTO (new DATV SDR)

Posted: Tue Oct 01, 2019 9:20 pm
by g0mjw
Yes, it works. Evariste has surpassed himself again. Just flash the new firmware and send your Pluto RTMP, which may require a fight with Windows network settings.

In my case my main PC refused to work but my laptop was fine.

Mike

Re: ADALM-PLUTO (new DATV SDR)

Posted: Sun Oct 06, 2019 9:32 pm
by m0eyt
Evening all,

Yep that's my twitter post 2 above this, the pluto is working really nicely on QPSK/8PSK and 16APSK. As Mike says you just shove an RTMP stream at the unit over IP and out comes RF.

In my config in the VMIX software I have;

URL : rtmp://1.2.3.4:7272/,437,DVBS2,16APSK,333,12,
Pass : ,M0EYT,

The parameters are fairly obvious, and should be in exactly the format described above. The only think I needed to tweak in VMIX was the video output setting so it basically matches the symbol rate, else overflows start to appear.

With the pluto the RF output on 2.4G is fairly low, I think from memory I measured -18dBm average with a 333Ksps QPSK, an old Avantek gain block takes this up to 20mW then another amp up to a watt where its fed to a PE1RKI amp for about 22watts at the feed, easily enough to get 333Ksps QPSK up to the satellite with a 1.2m offset dish. Now the setup runs on the bench, I'll put a USB <> Ethernet adapter onto the Pluto, and build PA/SDR etc into my outdoor unit along with WB/NB source switching.

PNG.png
PNG.png (15.25 KiB) Viewed 1466 times

Pic above shows the nice clean QPSK generated by the pluto.

Hope to see you on the w/b transponder,

regards,

Paul M0EYT.