Hello Marcus, I apologize for the delay in response, but I was able to solve the problem I was having with sending a signal at frequencies above 1.3 GHz. Turns out, in one of the two USRP's I am using for my project, I managed to get the cables for TX/RX and the RX2 flipped around when I set everything up (so I had the cable that was connected to the TX/RX hole on the front of the USRP connected to the RX2 terminal on the UBX 40 daughterboard, woops). Now I am able to get a clean signal transmitted without issue.
Upon fixing this problem I stumbled on another issue I have been scratching my head over this week without any success. When I turn on the USRP to transmit a signal, and I have muted my signal source blocks in GNU Radio Companion, I am still getting a signal. I have tried using both USRP's and the same thing happens, a signal appears when no signal source is supplying data to the USRP from the PC, and I do not understand why. The signal is about 2.125 KHz off from the center frequency set in the USRP sink block, with a power of roughly -100 dBm measured by the Spectrum Analyzer I have access to. The signal appears even when I have a null source block connected to the USRP sink block. Is this something that can be fixed or worked around? Is this suppose to happen when transmitting using a USRP x310 and a UBX 40 daughterboard? Any suggestions or insight you can provide would be greatly appreciated. Best Regards, Jerrid Plymale
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