I have recently had access to two SDRs a hackrf and a Plutosdr through my university.I am now trying to experiment and learn more about wireless communications and how to implement some examples on an SDR.
I have tried to implement a simple DVB-T loopback using the examples provided with gnuradio. the initial simulation without the sdrs work fine as expected but adding the sdrs to the equation ruins everything. I have tried to do this first using the plutosdr only as its full duplex however it still wouldn't work well so I would guess that my problem is not related to the LO mismatch between the two sdrs. plus, I would like to believe that channel equalization is not the issue as I have tried directly connecting the plutosdr to the hackrf with a sma cable.
I have attached a screenshot of the received spectrum by the hackrf and the flow graph I have used. Thus, I would really appreciate any help in troubleshooting this.