Chapter 2 19
Operation
Getting Started
Operation
Getting Started
The 11970 series of millimeter wave mixers have no bias or back-short adjustments. 11970
Mixers require an LO power of 14 to 18 dBm at the LO input. If the spectrum analyzer
used with the 11970 does not have sufficient LO power, an 11975A Amplifier or an
equivalent is required to increase this power.
CAUTION Before connecting the 11975A Amplifier, set its rear panel ALC switc h to ON.
Failure to do this can damage the mixer.

Mixer Connections

With the three SMA cables (Part Number 5061-5458, each) provided in the Option 009
Mixer Connection Kit, connect the 11970 Mixer, the spectrum analyzer, and the 11975A
Amplifier. An example connection for an 8566B Spectrum Analyzer is shown in Figure 2-1.
NOTE The example below shows an 8566B analyzer, other spectrum analyzers do
not require the amplifier and third SMA cable.
Figure 2-1. 11970 Mixer Connections
Leave the waveguide flange cap on whenever the mixer is not connected to a device under
test. This protects the flange mating surface from scratches, which can degr ade the mixer’s
performance. Use an appropriate waveguide attenuator if the output power of the unit
under test exceeds the RF Input Power indicated in the specifications.