DirecTV Advanced Installation Meter 2, Руководство по эксплуатации

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Page 55
AIM 2 Operation Manual
Task D. Tilt Adjustment (95°, 3-LNB, Slimline-5, and Slimline-5S
(SWiM) ODUs Only)
1. Loosen the ODU’s tilt lock-down screws.
2.
While monitoring the SNR bar on the
TILT ADJ
screen, slowly rotate the ODU around the tilt
axis until the maximum SNR value is reached.
SNR (“signal-to-noise” ratio) is a measure of
the received signal strength relative to the
strength of the received noise, which is an
indication of the quality of the signal.
3. Tighten the tilt lock-down screws.
4. Press
NEXT to continue.
For 3-LNB ODUs only, the VERIFY AZ & EL
screen appears following the tilt adjustment
to ensure the azimuth and elevation are still
properly aligned. Adjust the coarse azimuth and
elevation if necessary following the steps in the
Task B. Coarse Azimuth Adjustment and Task
C. Coarse Elevation Adjustment sections.
Task E. Fine Elevation Adjustment (Slimline ODUs Only)
1. Loosen the ODU’s elevation lock-down screws.
2.
Turn the ODU’s elevation jack screw counterclockwise 2 turns.
3. On the FINE EL ADJ screen, press SET REF to set the reference value.
The AIM sounds a confirmation tone and displays the reference value.
4. Zero out the readout dial on the elevation jack screw.
5. Turn the elevation jack screw clockwise until the meter begins to sound a series of
beeps, indicating that the reference value is within 1 dB. Continue turning until the meter
sounds a confirmation tone and the displayed signal power matches the reference value
(about 4 turns).