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7.4 Horizontal Scan
Narda IDA - 3106
137
7.4.3 Discrete Horizontal Scan with Max Hold
(Discrete with Max Hold)
It is possible that impulse radiation from signal sources such as radar will
not be captured when the
Discrete
function is used. Using the
Discrete
with Max Hold
function allows you to determine and save the maximum
value at a given position in such cases.
NOTE:
Further information on using polar diagrams and interpreting the results is
found under
Horizontal Scan in practice
on page 269.
To make a Discrete Horizontal Scan with Max Hold:
1.
Set the measurement parameters as desired.
2.
Press the
Scan Type
softkey and select
Discrete with Max Hold
.
3.
Hold the antenna in the desired direction.
4.
To start the measurement, press the button on the antenna handle or
press the
Start & Reset Max
softkey and wait for the maximum value to
be reached.
5.
Press the button on the antenna handle or press the
Add Value
softkey
on the Basic Unit.

The first measurement value is saved and shown in the polar
diagram.
6.
Pan the antenna to the new position and then press the button on the
antenna handle or press the
Reset Max
softkey to reset the maximum
value and save further measurement values in the same way. (The
antenna handle button function toggles between
Add Value
and
Reset Max
.)
7.
Press the
Delete Last Value
softkey to delete the last value you added.
8.
Press the
Stop
softkey to end the measurement.

The results are shown in the polar diagram and displayed
numerically.
9.
Press the
SAVE
key on the Basic Unit to save the measurement results.

A window shows the save process.
10.
To start a new measurement, repeat the steps from step 3 onwards.
(Starting a new measurement automatically resets the instrument.)
NOTE:
If you pan the antenna too quickly or tilt it by more than 15° horizontally or
vertically (elevation: ±15°, polarization: ±15°)
Azimuth uncertain
will be
displayed in red to indicate that deviations can occur in the bearing that is
determined.