User's Manual

3–9
PacketMax 100/300 User Manual, 10007306, Rev J
Chapter 3. Aperto Installation Manager
3.4.5 Aligning the Antenna
To align the antenna, perform the steps in this section.
1. While viewing the graph shown in Figure 3-7, move the antenna to maximize
the signal strength as shown on the graph. For 3.5 MHz channel bandwidth,
values greater than -92.1 dBm will work in QPSK -1/2. Values greater than -
86.6 dBm will work in 16QAM -1/2. Also, values greater than -77.1 will work in
64 QAM -1/2.
If the signal does not move up from the bottom of the Local Signal Strength graph
(i.e., shows -100 dBm), do the following:
• Verify that the frequency and BS ID were correctly configured.
• If the link has line-of-sight between the antennas, you should know the
general direction to align the antenna. Start in that direction. Move the
antenna every few seconds until the Local Signal Strength line rises at
lease once. Once it rises, slow the movement of the antenna. If the Signal
Indicator line has not risen after 2 to 3 minutes, it is best to click the Pre
-
vious and then the Next buttons to reset sequence.
• If the installation is not line-of-sight, either search for a first synchronization
(as indicated by the rise of the Signal Indicator line) or just pick a direction
to align the antenna.
2. Once the Local Signal Strength value is maximized, click on the View CINR
button to display the full window as shown in
Figure 3-8. To achieve a link
16QAM 1/2 or better, make sure the receive signal level is -87 dBm and the
CINR is greater than 8dBm.
Aperto products have adaptive modulation and error correction. As data is transferred
and high CINR is achieved, the system will automatically adjust to the highest modu
-
altion (64QAM 3/4).
AIM automatically transfers data following antenna alignment and reports the through-
put values attained, which will be less than actual since the system is adjusting for
the best throughput values.