These data were acquired in the process of collecting data for [1]. They comprise IQ waveform outputs of two different software-defined radios (SDRs) that were collected for various combinations of 1- and 2-tone excitation conditions. For details about how the data were collected, see that publication.
[1] McNulty, M., Gu, D., Kuester, D. and Nayeri, P. (2022), "Measurements of IP3 and P1dB for Spectrum Monitoring with Software Defined Radios," Proceedings of the 16th European Conference on Antennas and Propagation, Madrid, ES, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=934065.