The R&S FS-SNS55 from Rohde & Schwarz is a Noise Source with Frequency 100 MHz to 55 GHz, Output Power 1 W, Excess Noise Ratio (ENR) 7 to 21 dB, Flatness ±0.10 to ±0.41 dB (ENR Uncertainty), Temperature Coefficient 0.009 dB/Degree C. Tags: Module with Connector. More details for R&S FS-SNS55 can be seen below.