External Preamplifier 9kHz - 6GHz, TPA Connector, SMA Input, for use with MDO4000 Series The Tektronix TPA-N-PRE is a preamplifier for the MDO4000 Series Mixed Domain Oscilloscopes. Bandwidth: 9 kHz to 6 GHz Gain (nominal): 12 dB DANL improvement: 10 dB DANL with preamplifier attached to the MDO RF input: 50 kHz to 5 MHz: < -140 dBm/Hz (typ. -144 dBm) 5 MHz to 3 GHz: < -158 dBm/Hz (typ. -162 dBm) 3 GHz to 6 GHz: < -150 dBm/Hz (typ. -153 dBm) Application: Measurement of low-power signals