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Performing FA4800 AIND Alignment
Chapter 22
FA4800 User Manual
Release 1.9.30
22-2
installations, a long transmission line (RF cable) between the radio and
antenna will be used; oftentimes over 30 m (100 ft). In this case the atten-
uation (RF loss) of the cable must be determined (for both sides) and
entered as a dB loss in the Link Budget calculator. In many cases, a larger
antenna is necessary to compensate for this transmission line loss.
Andrew LDF and AVA cables are good for minimizing loss.
Performing FA4800 AIND Alignment
The supervisor of the antenna alignment should be located at Site A with a
Spectrum Analyzer.
Equipment Setup
¾
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 22-1
but connect a spec-
trum analyzer in place of the remote FA4800-AIND.
3. Turn on the CW transmit signal from site A (from the FA4800 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
¾
To align the antennas:
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.
3. Lock the azimuth axis.
4. 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.
5. 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.
6. 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 for AIND radios
on page
22-1
.)
Note
When one antenna is moved, the opposite site is passive. Move the
antennas very slowly.
Содержание FA4800
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Страница 22: ...FA4800 Broadband Wireless Transmission System USER MANUAL RELEASE 1 9 30 Part 1 Basic Installation...
Страница 161: ...FA4800 Broadband Wireless Transmission System USER MANUAL RELEASE 1 9 30 Part 2 Site Synchronization...
Страница 177: ...Site Configuration and HSS Chapter 10 FA4800 User Manual Release 1 9 30 10 16 Figure 10 16 HSS Not Supported...
Страница 178: ...FA4800 User Manual Release 1 9 30 11 1 Chapter 11 Reserved...
Страница 179: ...FA4800 Broadband Wireless Transmission System USER MANUAL RELEASE 1 9 30 Part 3 Advanced Installation...
Страница 225: ...FA4800 Broadband Wireless Transmission System USER MANUAL RELEASE 1 9 30 Part 4 Field Installation Topics...
Страница 262: ...FA4800 Broadband Wireless Transmission System USER MANUAL RELEASE 1 9 30 Part 5 Product Dependent Features...
Страница 273: ...FA4800 Broadband Wireless Transmission System USER MANUAL RELEASE 1 9 30 Part 6 Product Reference...
Страница 325: ...Montage sur un mur Appendix G FA4800 User Manual Release 1 9 30 G 5 Montage sur un mur Figure G 5 Montage sur un mur...
Страница 333: ...FA4800 User Manual Release1 9 30 Index 6 Ports LAN B 2 User Port Connectors B 2...