Post Go back to editing

Bug on FMComms block when running Pluto on Raspberry's GNURadio

Category: Software

Hi,

I am using the "enhanced Pluto" AD9361 2rx,2tx on the Raspberry's GNURadio 8. (I followed Jon's Kraft video here: https://www.youtube.com/watch?v=ph0Kv4SgSuI)

I have found FMCOMMS2/3/4 Sink (and source) does not work when having the following setup:

Using only one TX,RX, when you 

"Enable TX2" -> FMCOMMs2/3/4 Sink

"Enable RX2"->FMCOMMs2/3/4 Source

the gnuradio flowgraph cannot execute. 

Enabling TX1,RX1 will work fine. The issue are the Channel 2. A similar bug is reported in:  Pluto with 2 RX channels using GNURadio 

The workaround only works for GNURADIO 3.10 and above. (Running in the Raspberry is only 3.8). 

Is there any way to update the fmcomms blocks to the latest on 3.8 ?

Parents
  • Update:

    • Seems my PlutoSDR was resetting to 1r1t, but this was resolved it and fixed it to 2r2t.
    • I can confirm the flowgraph executes when FMCOMMS is enabled in either RX1/TX1 or RX2/TX2
    • Issues still, when enable a single RX/TX channel. I get multiple reflection peaks at different frequencies (instead of only one at 10.56 GHz, see image below)
    • Someone adviced me to use terminators in the channel disabled, has anyone experienced this before?

       

  •  Shall I open another question for the bug or maybe it's related to my own experiment ? Someone told me to try rf-terminators on the unused terminals of the pluto. but did not work and I still see the multiple peaks pattern in my fft plot (as related above)

Reply Children