HP 70427A User Manual page 245

Softkeys and Displays
120-300, 480-600
120-300, 480-600
This softkey tells the HP 70428A Option 002 to select an external RF source
frequency between 120 and 300 MHz or between 480 and 600 MHz. The
selection is stored in non-volatile memory.
The 120-300 MHz range has the lowest phase noise, but spurs may be
higher.
Path
Service Misc Optimum Range 120-300,480-600
HP-IB command
TS:RANG:MODE 1
HP 70428A Option 002
Figure 10-1
10-2 HP 70427A/HP 70428A User's Guide