
AM Detector: This block specifies the Amplitude Modulation Detector. In
most cases, the AM Detector will be a USER'S device under manual control
(although the System will allow you to specify the HP 11729C Option 130
as an AM Detector). The HP 11729C Option 130 includes an Internal AM
Detector. The HP 11729C can be controlled manually, or it can be under
System control when it has been entered in the System Configuration
Table. (The HP 11729C should be entered as a Down Converter in the
System Configuration Table.)
Cal Source: This block will appear on the Source Control display when
"Derive from Double Sided Spur" Calibration Process was selected. Either
a users Cal Source under Manual Control or a supported RF Source under
System Control can be selected for the Calibration Source. The Calibration
Source must have a calibrated AM output. Under Manual Control the
system will prompt you to connect the Cal Source and apply modulation
as well as disconnect it after the calculation process is complete.
DC Block:
The HP 11848A Phase Noise Interface must be dc blocked when using its
NOISE INPUT. The Interface will not tolerate more than ±2 mv DC Input
without overloading the LNA. A DC block must be connected in series
after the AM Detector to remove the dc component. A blocking circuit is
not provided with the HP 3048A. A dc block can either be constructed
or purchased. The HP 3048A Option K21 is designed specifically for this
purpose.
2-112 Source Control: AM Noise
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