Service manual

20 Agilent 85309A H20, H21 Operating and Service Manual Modification
Revised General Information
Agilent 85381A Cable
Length Limits
The following figure defines the allowable maximum cable lengths between
the LO source and the Agilent 85309A LO/IF distribution unit, and between
the Agilent 85309A and the external mixers. The cable lengths are provided
when using standard Agilent 85381A RF cable assemblies and with
MicroCoax type UFB311A RF low-loss cable assemblies.
The standard mixers used in Agilent antenna measurement systems are the
Agilent 85320A test mixer and the Agilent 85320B reference mixer. Both
mixers operate from 2 to 18 GHz in fundamental mode, and from 6 to
26.5 GHz in third-harmonic mode. Figure 3 shows the RF power levels
required for proper operation with the Agilent 85320A/B mixers and various
other mixer products provided by Agilent Technologies.