hey man, many many thanks for the detailed reply! Based on it, I decided to achieve frequency hopping not by changing the centre frequency of the USRP, but by multiplying my signal with a sine of a certain frequency offset and then transmit that signal over the USRP with a fixed USRP. Unfortunately, a new problem has arisen. you can see my flowgraph attached
I want my signal to be transmitted on 5.804GHz. to this end, the centre frequency is set to 5.799GHz, and the signal that I wish to transmit is multiplied with a sine wave of 5MHz. (I'm storing everything as a file before transmitting, as things are otherwise too slow). The problem now is that when I transmit the signal over the USRP, it is not transmitted on 5804 MHz but on approx. 5802 MHz. Furthermore, this error appears to become bigger with bigger frequency offsets: When I want the signal to be transmitted with 20MHz offset to the centre frequency of the usrp (thus using a sine wave of 20MHz), the difference between the intended signal frequency and the true signal frequency is almost 10 MHz! Am I doing anything wrong here?? kind regards and thanks so much, Mat Attachments: http://www.ruby-forum.com/attachment/10982/modulator.jpg -- Posted via http://www.ruby-forum.com/. _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
