Hi everyone, I made a test for UHD blocks today, and I found a problem as follows:
I take two USRP2 boards for my test. One is used as transmiter and the other board is set to be receiver.And I use UHD Simple Sink and UHD Simple Source blocks for transmiting and receiving respectively. sampling frequency = 195.312K (which is the minimum sampling frequncy of the system). gain=0 The transmitted signal is a AM modulated sine signal. The frequency of orignal sine wave (the message signal) is 10K Hz. The frequency of carrier signal (center frequency for modulation at transmitter board) is 2.42 GHz, and I use the same frequency at the receiver board for demodulation. Amplitude of transmitted signal is 0.05. I connect the two boards together, and I add a scope to observe the period of the received demodulated signal. The problem is the period is about 0.000045, which means the frequency of the signal I received is not 10 KHz, but about 2.2 KHz. I have used the same external reference clock and PPS signal for both of the boards, so I think they are set up correctly. Why do I get a received signal with different frequency from what I transmit? Does anyone meet the similar problem before? How may I solve the problem? Thanks so much for every help and suggestions in advance. Best regards, Hongliang -- View this message in context: http://old.nabble.com/Problem-of-using-UHD-blocks-as-Tx---Rx-tp30069825p30069825.html Sent from the GnuRadio mailing list archive at Nabble.com. _______________________________________________ Discuss-gnuradio mailing list [email protected] http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
