Specifications

Appendix D AIND Antenna Alignment Procedure FibeAir 4800 Installation and Operation Guide
D-2 FibeAir 4800 Installation and Operation Guide
D.1 Expected Signal Level
Based on the link budget parameters of the actual FibeAir 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 FA4800 Manager Software
CD-ROM to calculate the expected performance of the FA4800 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 FA4800-AIND Alignment
The supervisor of the antenna alignment is situated at the receive site with the
Spectrum Analyzer.
Equipment Setup
®
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 FA4800-AIND.
3. Turn on the CW transmit signal from site A (from the FA4800 NMS).
4. 4. At site B, tune the SA to the frequency transmitted.
5. 5. Increase the SA sensitivity according to the expected receive signal.
Align 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