Dear all, I have tried to use the QPAK modulation and demodulation exapmle from the tutorial in the link below. I am using two USRPs B205 as transmitter and receiver, frequency 910MHz , sampling rate 300k or 1 M sps. However, the received signal's constellation after Costas loop are not synchronized (points everywhere in the constellation diagram). Am I missing something i have to change in the usrp setting or synchronization block?
https://wiki.gnuradio.org/index.php?title=QPSK_Mod_and_Demod#Phase_and_Frequency_Correction Best regards, Ali siddig
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