Compatible with external mixers, including the 11974 series
Rear panel outputs include the 3 to 6.6 GHz LO and two IF outputs at 321.4 MHz and 21.4 MHz
The 70909A RF section provides coverage from 100 Hz to 26.5 GHz. This RF section is used in the 71209A spectrum analyzer. Diode-pair mixing provides lower conversion loss, allowing the spectrum analyzer to have sensitivities that compete with fundamentally mixed designs. The sensitivity is also improved by the use of a built-in preamplifier before the first mixer (in the microwave path). For millimeter measurements, this RF section includes the extra switching and signals necessary to connect external mixers, including Keysight 11974 series preselected mixers. The 70909A Option Z40 makes use of this capability and integrates preselected mixing to 40 GHz. A switched LO is routed to the front panel for connection to an external mixer. Rear panel outputs include the 3 to 6.6 GHz LO, and IFs at both 321.4 and 21.4 MHz. The spectrum analyzer adjusts gain within the module to keep a constant relationship between the power out of the input attenuator and the IF outputs.