Specifications

Chapter 10 83
Using External Millimeter Mixers (Option AYZ)
Making Measurements With Agilent 11970 Series Harmonic Mixers
Using External Millimeter Mixers
(Option AYZ)
Step 2. Perform a factory preset:
Press
Preset, Factory Preset (if present).
Step 3. Set up a high frequency signal on a microwave signal generator (no
modulation required). Set the frequency to 35 GHz and the amplitude
to 0 dBm.
Step 4. Select external mixing, and then select band A (from 26.5 to 40 GHz):
Press
Input/Output, Input Mixer, Input Mixer (Ext).
Press
Ext Mix Band, 26.5−40 GHz (A).
The IF output of a harmonic mixer contains a signal at the
intermediate frequency of the analyzer whenever the harmonic
frequency of the LO and the frequency of the RF differ by the
intermediate frequency. As a result, within a single harmonic band, a
single input signal can produce multiple responses on the analyzer
display, only one of which is valid (see the left display in Figure 10-2).
These responses come in pairs, where members of the valid response
pair are separated by 642.8 MHz and either the right-most (for negative
harmonics) or left-most (for positive harmonics) member of the pair is
the correct response.
Step 5. Turn on the signal identification feature to show the real signal
response at 35 GHz (by default, the type of signal identification is
Image Suppress):
Press
Input/Output, Input Mixer, Signal ID (On).
Step 6. Place a marker on the real signal and turn off signal identification
before making the final amplitude measurement:
Press
Peak Search.
Press
Signal Ident (Off).
Figure 10-2 Signal Identification (Left - Signal Id Off; Right - Signal Id On)