ACE Technology
8
A. Antenna Isolation
If the isolation between the outdoor and indoor antennas is not sufficient, the repeater
will oscillate and turn itself off. It is recommended that when turning on the repeater
for the first time, both the up link and down link attenuation, marked “UPLINK
ATT.” and “DOWNLINK ATT.” respectively, should be fully engaged. The
dipswitch setting and the levels of attenuation are shown in figure 2-6 and Table 2-6.
<Figure 2-6: Dipswitch setting>
<Table 2-6: Dipswitch Setting>
Dipswitch Number 1234
Attenuation (dB), (Dipswitch ON) 2 4 8 16
As shown in table 2-6, each dipswitch has different attenuation associated with it,
and may be used in combination of others. For example, to obtain an attenuation of
20 dB, dipswitches number 2 and 4 should be in “ON” position, and the dipswitches
number 1 and 3 should be in “OFF” position. (0 + 4 + 0 + 16 = 20). Attenuation
level can be set from 0 to 30 dB by 2 db increments.
Starting from the maximum attenuation, 30 dB, decrease the attenuation level in
2 dB steps by manipulating the dipswitches until all the switches are in “OFF”
position, or stop and back off by 2 dB if you trigger either of the over-drive alarms,
“OVRPWR ALM”, for maximum gain.
B. Antenna Alignment
If you are triggering the overdrive alarms at any point, try to increase the isolation
between the antennas by relocating them. The indoor antenna should be placed
physically as far away from the outdoor antenna as practical. If the geometry of the
intended coverage area allows it, you should also try the indoor antenna in such
way that interference between the antennas is at the minimum. If you are using
directional antennas, try to find a location for the indoor antenna where it can cover
the needed area and oriented back to back with respect to the outdoor antenna.
N
O
1 2 3 4 OFF
ON
