The 2658A from B&K Precision is a RF Spectrum Analyzer with Frequency 50 kHz to 8.5 GHz, Resolution Bandwidth 3 MHz, Video Bandwidth 100 Hz to 1 MHz, DANL -127 dBm/Hz, Harmonics Less than -40 dBc. Tags: Analyzer with Screen. More details for 2658A can be seen below.