Agilent Technologies 85309B, Manual, Page: 31 / 76

Service Guide 85309-90082 2- 11
LO/IF Distribution Unit Operating Information
85309B Cable Length Limits
Cable Length Limits
The following figure defines the allowable maximum cable lengths from the LO Source to the 85309B, and
the cable connecting the 85309B and the external mixers. The cable lengths are provided when using
standard RF cable assemblies and with MicroCoax (UFB311A RF) low-loss cable assemblies.
The standard mixers used in Agilent antenna measurement systems are the 85320A test mixer and the
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 2-6 on page 2-12 and Figure 2-7 on page 2-13 show the RF power levels
required for proper operation with the 85320A/B mixers and various other mixer products provided by
Agilent Technologies.