ADALM-PLUTO (new DATV SDR)

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f1faq
Posts: 38
Joined: Thu May 12, 2016 1:19 pm

Re: ADALM-PLUTO (new DATV SDR)

Post by f1faq » Thu Aug 24, 2017 12:50 pm

Hello , tests results on my side
Freq extension configuration : Ok
Receiving end: Tutioune with SERIT pro
Tests performed at 1255MhZ : All modes modes DVB-S and DVB-S2 (QPSK, 8PSK, 16APSK, 32APSK) Ok for SR from 125K to 2M maximum
MER from 10db (32APSK) to 14db (16APSK) to 16-17dB (8PSK) and to 18-19dB (QPSK)
Timing lock indicator only 41% for low SR / Up to 92-98% at 2M
Not detailed but quite similar figures at 2400Mhz
No image decoded at 437Mhz whatever the mode (signal too dirty ?)
Signal too small at 146Mhz (not usable for us in France, for tests purposes only)

There is a pike on the signal, due to not balanced IQ ?
See pictures taken : https://www.dropbox.com/s/nic2dqoulzftw ... DR.7z?dl=0

Pluto disconnects when I plug in a USB item (my logitech C920 cam) and select it in the menu (video input)

73's - Christian
F1FAQ

G4GUO
Posts: 665
Joined: Tue Feb 16, 2010 12:51 pm

Re: ADALM-PLUTO (new DATV SDR)

Post by G4GUO » Thu Aug 24, 2017 1:10 pm

Hello Christian,

I have not done any calibration of the Pluto (mainly because the link on the
Analog Devices website that tells you how to do it is broken).

On my system the spike is hardly noticeable.

I have primarily done my tests at 1.249 GHz so I can't comment on the
results you are seeing. Compared to DATV-Express the EVM (directly equivalent to MER)
is worse but that may well be due to lack of calibration.

I will power up my modulation analyser later today and do some tests at the
various frequencies.

- Charles

G4GUO
Posts: 665
Joined: Tue Feb 16, 2010 12:51 pm

Re: ADALM-PLUTO (new DATV SDR)

Post by G4GUO » Thu Aug 24, 2017 1:44 pm

I have had a chance to look at it using Spike modulation analysis software.
The signal at 146.5 and 437 looks fine (not as good as DATV-Express though).
I did find that I have set the level too high in DVB-S mode and there is a numerical
overflow in the AD9363's internal filter (it is OK with DVB-S2). I will reduce the
magnitude of the symbols I am sending to eliminate the overflow.

- Charles

G4GUO
Posts: 665
Joined: Tue Feb 16, 2010 12:51 pm

Re: ADALM-PLUTO (new DATV SDR)

Post by G4GUO » Thu Aug 24, 2017 2:35 pm

Here is a link to the limitations of the Pluto SDR
https://wiki.analog.com/university/tool ... users/name

I am getting no where near the claimed 7 - 11 MS/s performance.
All the other things I can live with

- Charles

G3GJA
Posts: 124
Joined: Sun Nov 20, 2011 3:44 pm

Re: ADALM-PLUTO (new DATV SDR)

Post by G3GJA » Sat Aug 26, 2017 6:44 am

Clive I don't think you have done the mod correctly, check that

# fw_printenv attr_name
# fw_printenv attr_val

return the right values someone else couldn't get the extended range to work and it turned out
fw_printenv attr_val was returning "ad9364" when it should have been ad9364 without quotes

- Charles
Spot on Charles. I've corrected that so I'll now have another go.

Thanks

Clive

MW0LLK
Posts: 10
Joined: Sat Jun 06, 2015 8:47 pm

Re: ADALM-PLUTO (new DATV SDR)

Post by MW0LLK » Sat Aug 26, 2017 9:39 pm

Same problem...

The page at: https://wiki.analog.com/university/tool ... ustomizing incorrectly states:
To change things to the AD9364 configuration:

# fw_setenv attr_name compatible
# fw_setenv attr_val “ad9364”
# pluto_reboot reset
The second line should be:
# fw_setenv attr_val ad9364

G4WIM
Posts: 318
Joined: Thu Jan 29, 2015 8:36 pm

Re: ADALM-PLUTO (new DATV SDR)

Post by G4WIM » Sun Aug 27, 2017 3:50 pm

Well I've unpacked my Pluto and installed its drivers and everything looks good under device manager, sadly when I try and run the Express DVB app it doesn't start - this is under windows 10 64 bit.

The app doesn't start for my DATV express card either, but in device manager it shows up under Atmel devices but does appear to have the correct libusb-win32 driver installed.

Any ideas as to what I've screwed up this time ?

73 Tim

G4GUO
Posts: 665
Joined: Tue Feb 16, 2010 12:51 pm

Re: ADALM-PLUTO (new DATV SDR)

Post by G4GUO » Sun Aug 27, 2017 4:17 pm

Difficult to say.
Probably some parameter in the datvexpress.cfg file is wrong, you could try
posting it's contents on here for me to look at (or email me with it).

- Charles

G4WIM
Posts: 318
Joined: Thu Jan 29, 2015 8:36 pm

Re: ADALM-PLUTO (new DATV SDR)

Post by G4WIM » Sun Aug 27, 2017 4:22 pm

Hi Charles,
thanks for the idea - I'll copy a working config file from my windows 7 machine (where it works ok) across onto my Win 10 machine and see how that works out.

G4GUO
Posts: 665
Joined: Tue Feb 16, 2010 12:51 pm

Re: ADALM-PLUTO (new DATV SDR)

Post by G4GUO » Sun Aug 27, 2017 5:05 pm

The top 2 lines should say

[SDR HW] PLUTO
[SDR IP] C0A80201

- Charles

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