Appendix C: AIND Alignment
WinLink Performing WinLink AIND Alignment
11-143
number of E1/T1 services available at a specified distance. In all-indoor type
installations, a long transmission line (RF cable) between the radio and
antenna will be used; oftentimes over 100’. In this case the attenuation (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 WinLink AIND Alignment
The supervisor of the antenna alignment is situated at the receive site with
the Spectrum Analyzer.
Equipment Setup
Æ
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
11-1 but connect a spectrum
analyzer in place of the remote WinLink-AIND.
3.
Turn on the CW transmit signal from site A (from the WinLink 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.
Æ
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.
Note
