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Overview
Figure 2-2
Microwave
Downconverting
Detecting AM noise at
the RF input
Getting Started
HP 70427A Microwave Downconverter
HP 70427A Microwave
Downconverter
HP 70427A Microwave Downconverter
The HP 70427A Downconverter accepts signals between 5 MHz and
26.5 GHz at levels from –30 dBm to +30 dBm. Signals above 1.5 GHz are
mixed with an internal low-noise local oscillator (LO), which tunes in 600
MHz steps, resulting in an intermediate frequency (IF) between 300 and 900
MHz.
The input signal goes from the SIGNAL connector to a 0 to 35 dB step
attenuator (5 dB steps) before being mixed with the LO. An adjustable IF
amplifier follows the mixer. It's gain range is –10 to 45 dB in 5 dB steps.
For input frequencies below 1.5 GHz the signal goes through the input
attenuator and to the IF amplifier, bypassing the mixer.
The downconverter has an input AM noise mode that routes the input signal
to the input attenuator and then to an RF AM detector. The detected output is
routed to the AM NOISE connector. Input signals are not downconverted
when the downconverter is in AM noise mode.
2-2 HP 70427A/HP 70428A User's Guide
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