I am watching the signal out of one of the ad9364's Tx interfaces, both while generating a sine wave.
Everything is done using OS-flow.
The sine wave is 35 kHz, with 1362.5 MHz carrier frequency. The out_voltage_rf_bandwidth is 200 kHz, the ENSM mode is FDD and the out_voltage0_RX_LO_frequency is 70 MHz while transmitting.
My problem is that there is some kind of high noise around the Tx signal. The relevant signal is -5 dBm while the adjacent peaks are -45 dBm. Is that within expected performance? Please see image below (vertical are dBm, and horizontal are MHz):
Also, if I increase the sine's frequency, I can see a signal at 1362.5 MHz (which is TX LO) and the signal at TX LO + sine's frequency. Why is the TX LO present?
Thank you for your help.