Specifications

Appendix D AIND Antenna Alignment Procedure Installation and Operation Manual
D-2 Performing Airmux-200-AIND Alignment Airmux-200 Ver. 1.750
D.1 Expected Signal Level
Based on the link budget parameters of the actual Airmux sites, you need to
calculate the expected signal level that will be received by the receiving site.
Use the Link Budget Calculator utility supplied on the Airmux-200 Manager
Software CD-ROM to calculate the expected performance of the Airmux-200
wireless link. The utility allows you to determine the RSS of the link, and find the
number of E1/T1 services available at various data rates, with the minimum and
maximum distance.
D.2 Performing Airmux-200-AIND Alignment
The supervisor of the antenna alignment is situated at the receive site with the
Spectrum Analyzer.
Setting Up the Equipment
 To set up the antenna alignment equipment:
1. Coarsely align the two antennas. Use the compass readings taken during the
Site Survey to point the antennas in the correct direction.
2. Connect the equipment as shown in
Figure D-1 but connect a spectrum
analyzer in place of the remote Airmux-200-AIND.
3. Turn on the CW transmit signal from site A (from the Airmux-200 NMS).
4. At site B, tune the SA to the frequency transmitted.
5. Increase the SA sensitivity according to the expected receive
signal.
Aligning the Antennas
• When one antenna is moved, the opposite site is passive
• Move the antennas very slowly
1. Slowly move the site B antenna azimuth axis (the elevation axis should be
locked) until you see the best signal on the SA. Lock the azimuth axis.
2. Slowly move the site A antenna azimuth axis (the elevation axis should be
locked) until you see the best signal on the SA. Lock the azimuth axis.
3. Slowly move the site B antenna elevation axis (the azimuth axis should be
locked) until you see the best signal on the SA. Lock the elevation axis.
4. Slowly move the site A antenna elevation axis (the azimuth axis should be
locked) until you see the best signal on the SA. Lock the elevation axis.
5. Repeat steps 1 to 4 until the reading on the SA is equal or as close as
possible to the calculated receive signal (for Rx Power Level see
Expected
Signal Level
).
Note