I'm currently working with the bladeRF xa4 2.0 in GNU Radio, attempting to create a simple TX cosine signal with a frequency of 1MHz. However, I'm facing difficulties as I can't see the peak at 900MHz on the spectral analyzer.
I have both the bladeRF and the spectral analyzer connected to an antenna for 900MHz, and they are approximately 2 meters apart. The project launches without any errors.
I'm attaching a sketch with my current settings for reference. If anyone has encountered a similar issue or can provide guidance on what might be going wrong, I would greatly appreciate your input.

Thanks in advance for your help!