The signal that we are interested in and want to process is a continuous wave (CW) signal with a center frequency of 318450 Hz. The radio transmitter in CW signal of 318450 Hz frequency and can now be received and processed by other receivers and antennas. We would like to receive it using the USRP X310. When the GNU radio tool creates a flowgraph (flowgraph picture) and receives a signal, it is output as shown in the figure below (signal picture)
To minimize the signal noise, we set the average time to 5 seconds and increased the fft size, but it does not appear to be a spectrum that looks like there will be a CW at 318450 Hz frequency.
If it could be a problem with the digital filter in the USRP, when removing the antenna from the USRP and checking the spectrum, it was confirmed that the center frequency was captured at a slightly different point as shown in the picture below. (filter picture)
Is this a problem with the USRP X310 equipment?
Is it a problem with GNU Radio?
We would appreciate it if you could let me know if there is a solution.
