Service manual

Agilent 85309A H20, H21 Operating and Service Manual Modification 13
Introduction
Introduction
This operating and service manual modification describes the differences in
the Agilent 85309A H20 and H21 options compared to the standard
Agilent 85309A LO/IF distribution unit. It also describes the manual
changes necessary to document the Agilent 85309A H20 and H21.
Description The Agilent 85309A H20 and H21 are broadband, distributed frequency
converters that utilize fundamental mixing to provide the performance
required for antenna measurement systems. The Agilent 85309A H20 and
H21 have one reference channel, up to three test channels, and operate from
100 MHz to 18 GHz in two overlapping bands, as follows:
The measurement bands can be selected manually from the instrument’s
front panel BAND SELECT switch or the TTL interface provided at the rear
panel SELECT port for automated control.
Option Definition The Agilent 85309A H20 and H21 are distinguished by the number of test
channels available, as follows:
NOTE Use Agilent 85320A/B option H20 external mixer modules to utilize the 0.1
to 3 GHz frequency range of operation.
Agilent 8836xx Series
LO Source Operation
Note
When using an Agilent 8360 series synthesized sweeper as the LO source,
set the output power level to approximately +10 dBm in order to minimize
potential Agilent 85310A system-generated spurious signals in the 0.1 to 3
GHz range.
The spurious signal levels seen on the Agilent 8510/30 depend on the LO
power level setting.
Band Operating Frequency
Low band 0.1 to 1 GHz
High band 0.3 to 18 GHz
Option Number of Test Channels
85309A H20 1
85309A H21 2