The R&S FSH4 from Rohde & Schwarz is a RF Spectrum Analyzer with Frequency DC to 3.6 GHz, Resolution Bandwidth 1 Hz to 3 MHz, DANL -125 to 0 dBm(-146 dBm), Third Order Intercept(TOI) 11-15 dBm, Power 50 dBm. Tags: Analyzer with Screen. More details for R&S FSH4 can be seen below.