Detecting Am Noise At The If Output; Routing The Input To An External Instrument; Monitoring The If Output; Configuring The Reference Chain - HP 70427A User Manual

Detecting AM noise at
the IF output
Routing the input to an
external instrument
Monitoring the IF
output
Configuring the
reference chain
Figure 2-3
Millimeter wave
downconverting
This detector is not available when an external mm wave mixer is used with
the downconverter.
The downconverter's IF amplifier includes an AM detector that operates
unless the RF AM detector is switched in. The output of this detector is
normally routed to the AM NOISE connector.
The downconverter's input can be routed to the RF ANALYZER output.
When the softkey has IN underlined the input signal is routed
VIEW IN | IF |-
through the input attenuator and to the RF ANALYZER connector.
When the
VIEW IN | IF| -
amplifier's output is routed to the IF connector and to the RF ANALYZER
connector so that the IF signal can be monitored while the downconverter
operates normally.
The downconverter's local oscillator (LO) is derived from a low-noise
reference chain. The reference chain's tuning sensitivity and phase-lock-loop
bandwidths can be selected from menus on the MMS display. The reference
chain can also be tuned by a voltage applied to the VOLTAGE CONTROL
connector.
Reference Chain
The downconverter's range can be extended to 110 GHz by adding an
external millimeter (mm) wave harmonic mixer. In mm mode the
HP 70427A Microwave Downconverter
softkey has IF underlined a portion of the IF
HP 70427A/HP 70428A User's Guide 2-3
Getting Started