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11-APR-06 Rev E OMACS3000
27 of 51
System Screens
The specific procedure to acquire the satellite is:
1. Connect the Spectrum Analyzer to the LNA output or convenient downlink monitor port.
2. Set the Spectrum Analyzer center frequency to the correct frequency for the satellite to be acquired.
3. Set the Spectrum Analyzer Settings shown below:
Reference Level: As applicable
Input Attenuator: 0 dB
Scale: 10 db/Division
Center Frequency: For the base satellite
Span: 200 MHz
Resolution Bandwidth: Auto
Video Bandwidth: Auto
Sweep Time: Auto
These settings should produce a fast sweep on the analyzer.
4. Point the antenna to the base satellite corrected angles, the 149.769° Az and 47.200° El corrected
by the course correction factors determined above.
5. Manually move the antenna in azimuth at the initial elevation angle, used in Step 4 above, over the
range of ± 2°.
6. While moving the antenna, monitor the Spectrum Analyzer for signals.
7. If a signal is detected, maximize the received signal level by tweaking the antenna azimuth and
elevation angles.
8. If a signal is not detected, increment the antenna elevation angle, in 0.50° steps, and repeat Steps 5
to 8 above as shown in the figure, until the satellite is acquired.
The above procedure is intended to peak the antenna on the satellite. To complete the antenna peaking on
the satellite, align the antenna feed polarization with the satellite by peaking the co-polarrized feed port with
a satellite signal or null the cross-polarized feed port with a satellite signal by rotating the feed .
The operator selects the Next button when he is satisfied the antenna is peaked on the satellite and that the
look angles entered in the azimuth and elevation boxes are accurate. The Next button then calibrates the
azimuth and elevation resolvers and defines the offsets such that the defined look angles correspond to the
base satellite.