HP 70427A User Manual page 350

Softkeys and Displays
Power Control
Power Control
This softkey displays a menu of softkeys for selecting the noise performance
of the local oscillator or source.
The choices are and .
Low Noise Linear
In the low-noise mode the amplifiers at the output of the YIG-Tuned-Filter
(YTF) are biased into hard compression for low noise. But, because of the
hard compression the waveform tends to have high order harmonics.
In the linear mode the amplifiers are biased linearly, which makes the higher
order harmonics lower. Also, the output level will tend to be more accurate
with the HP 70428A Option 002, AM on the external RF source's signal will
be passed through.
The choice is stored in non-volatile memory.
Path
Service Misc Power Control
HP-IB command None.
Figure 10-75 Reference Chain
HP 70427A/HP 70428A User's Guide 10-107