User's Manual

Bi-directional Amplifiers

510 and 610 Series

WESTELL.COM

1.877.844.4274 Page 15 of 29

Figure 3-1: Multiple Internal Antenna System Design

Figure 3-1 shows one example of multiple internal antennas implemented using Westell passive devices (listed in

section 3.5 Optional Accessories) for models or in building coverage requiring a distributed antenna system design.

See the FCC ID grant notes associated with the model for additional booster installation requirements.

3.3 Troubleshooting

Carefully check all cables for shorts and opens.

Check the rooftop antenna, if directional, for proper alignment along the calculated compass heading. Typically, the

directional antenna should be aimed at the same site that your handset uses in the area where the outside antenna

is placed.

If cables and alignment are acceptable, it may be necessary to use a spectrum analyzer to examine the signal

environment in which the BDA is operating. The existence of strong analog signals within the frequency bands can

cause the AGC to reduce the ampliﬁer’s gain, particularly on the downlink. In some cases, additional ﬁltering is

required to reject these unwanted signals. The directional outside antenna can be reoriented horizontally, to place

the interfering source in an antenna pattern null. At a site containing significant interference from outside signals

that require expensive and possibly prohibitive measures to ﬁlter, reduce, or eliminate interference, it may not be

practical to use the BDA to provide coverage.

3.4 Optional Accessories

A complete line of accessories is available from Westell. Check with your Westell distributor for any additional items

needed. The following products suitable for most in-building needs.

Outside high gain yagi antenna

PCS - model number CSI-AY/1.85-1.99/10

SMR 800 and Cellular - model number CSI-AY/806-960/11 and CSI-AY/806-960/14

SMR 700 - model number CSI-AY/700-806/11