18.1 Holding and panning the directional antenna properly
Narda IDA-3106 267
Visual check (Azimuth uncertain)
The elevation and polarization are monitored continuously during a
Horizontal Scan. If an angle of 15° is exceeded, the display indicates
Azimuth uncertain to warn you that the bearing result may be impaired.
Figure 59: Azimuth uncertain indicates that the antenna is not being held properly.
In this example, the elevation angle is much too high at 18.5°.
Audible check (Tone Search)
In addition to the Azimuth uncertain indicator, you can activate an audible
check (Tone Search) similar to the park distance control system in an
automobile. Deviations from the ideal central position are signaled by an
intermittent tone that changes to a continuous tone as the angle increases.
• ±7.5° to ±15°: intermittent sound
• 15° and -15°: continuous sound
To activate tone search:
The Direction Finding menu is selected.
1. Press the Audio softkey, then press the Tone Search softkey.
2. Select Leveling using the rotary control knob and press OK to confirm.
Tone Search is activated.
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