NARDA IDA, Руководство по эксплуатации, Страница: 141 / 292

7.3 Manual Bearing
Narda IDA - 3106
133
The pitch of the tone will still change even if the upper (2,000 Hz) or lower
(500 Hz) limit of the bar graph has already been reached. This gives you a
means of qualitatively assessing a change in signal strength outside the
visual display range.
The difference in pitch corresponds to two octaves for the values stated
above. You can scale the Y-axis (see
Adjusting the Y axis (Y-Scale)
on page 105) to alter the frequency ratio per dB between the high and low
tone. The frequency ratio per dB can be set in the range from 20 to 120 dB.
The Y-axis scaling must be set to 40 dB to achieve a value of 20 dB/octave.
Leveling
This mode converts the polarization and elevation angles at which the
antenna is held into an audible signal.
• < ±7.5°: no signal
• ±7.5° to ±15°: intermittent sound
• > ±15°: continuous sound
This gives you an audible check that the antenna is aligned horizontally. A
further audible signal indicates when the rotation (panning) speed is too
high.
 You can find further information about this in the Annex under
Proper
holding
on page 266.
To activate / deactivate audible signals:
1.
Press the
Audio
softkey, then press the
Tone Search
softkey.
2.
Use the rotary control knob to select the desired setting and press
OK
to
confirm.
3.
To deactivate the audible signals, select
Off
using the rotary control knob
and press
OK
to confirm.