FlightTransport Installation Guide
505-003686-00000 Rev A
2-23
2.7.2. LED BAR GRAPH – OPTICAL INPUT LEVEL
The bar graph is used to align the link head by giving a quick
indication of the received power at the linkhead.
•
One “bar of power” is equal to one green LED on the rear panel
Received Optical Power indicators
•
The bars are counted from left to right and there are ten bars
•
The number of bars of received power will depend on the distance
between the link heads and the actual weather conditions
•
The number of bars should be approximately equal when both link
heads are correctly aligned, and the Power Adjustment Knob (see
below) is set to the same level on each side
2.7.3. POWER ADJUSTMENT KNOB
The power adjustment knob is used to set the optimum received
power level once the units are aligned. This avoids saturating the
receiver with too much power. This allows the links to be installed at
close ranges as low as 10 meters apart.
•
During the initial alignment, turn the Power Adjustment Knob
anticlockwise (wide open) to the Maximum Receive Power
(minimum attenuation) position (see picture below).
•
Leave the knob in this position during alignment with the
telescope and power bars. Once the alignment procedure is
complete, check the reading on the LED Bar Graph. If the reading
is 9 bars or less, then the power does not need to be adjusted.
•
If the reading is more than 9 bars or the Overload LED is
illuminated, turn the Power Adjustment Knob clockwise until the
LED Bar Graph reads 8-9 bars.
Maximum Optical
Receive Power
When the alignment process is performed under clear weather
conditions, and the link heads are no further apart than the
recommended optimal distance, the bar indicator should illuminate
between 5 and 9 bars. If the Overload LED is illuminated, then turn
the Power Adjustment Knob as described above.
Note:
The system will operate when the bar graph indicator shows
only one bar of power. This should only occur during times of poor
visibility, fog, etc.
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