Content applies to the CATR
Antenna alignment improves the repeatability and accuracy of your test. Complete the
following steps to align the positioner to the CATR plane wave whenever the absolute zero of
the positioner changes.
Ensure the following tasks are complete
before you align the antennas:
- Ensure the feed antenna and reflector are properly aligned by NI services personnel. If
anything has come into contact with the feed antenna or reflector and you think the parts
are misaligned, contact your NI services personnel for support.
- Visually inspect the feed antenna and reflector for damage.
- Complete the steps in Attaching the Reference Antenna.
- Ensure the chamber door is closed.
Open the mmWave OTA
Validation Antenna Alignment Helper located at
Select the mmWave_VST in the Resource
Name list, and verify that the port strings in the SG
Port and SA Port textboxes are as follows.
SA Port: The port string for the first connected mmRH-5582 to the feed antenna port V is
SG Port: The port string for the second connected mmRH-5582 is rf1/port0.
Click Start to begin the alignment procedure.
The alignment procedure takes approximately 30
seconds and searches for the best alignment position in both azimuth and elevation.
The Start and Commit Values to Positioner
buttons are disabled during the procedure.
Click Commit Values to Positioner when antenna alignment is
Ensure the Azimuth Profile and Elevation Profile plots look similar to the
following figure, where the Azimuth Peak is approximately 0° and the Elevation Peak is
Figure 1. Set Absolute Home Window
Click Set Absolute Home to save the position in the chamber. The
position remains saved in the chamber after restarting the system.
After antenna alignment is complete, perform
system calibration to determine path losses in the system.