The 8553B RF Section is for use in a 141T Spectrum Analyzer System (sold separately). The unit covers the frequency range of 1kHz to 110MHz. This frequency range includes audio, video, navigation aids, communications basebands, broadcast AM and FM, and TV. This analyzer features high sensitivity, stability and resolution. 10Hz frequency accuracy with the 8443A Tracking Generator (sold separately); Calibrated amplitude from -142 dBm to +10 dBm, (18 nV to 0.7 V) ; Accuracy: ±1.25 dB.