Cisco BWX 8305 Installation And Commissioning Manual page 40

BWX 8305 Basestation Antenna Installation
Figure 6-3
The 8 element BWX 8305 Basestation Antenna has 6 degrees of fixed electrical downtilt.
Note
6.3.1.1 Filters
In the BWX 8305 Basestation Antenna you have the option to:
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BWX 2305 Basestation Installation and Commissioning Guide
6-4
BWX 8305 Basestation Antenna
1- Use a Band filter:
The Band filter is of the Cavity type. The Channel filter is also of the cavity type but with a Dielectric
Resonant Oscillator (DRO) "puck" placed in the cavity to improve performance. Frequently, the
words "Cavity filter" are used in conjunction with the Band filter.
The functions of the Band filter are two-fold: (1) to shape the out-of-band emission (e.g., L.O.
Linkage, harmonics, and other spurious emissions) during transmission in order to meet Federal
Communications Commission (FCC) or other regulatory requirements; (2) to provide rejection for
close-in interference (e.g., Personal Communication Systems/Advanced Mobile Phone
System(PCS/AMPS) and other cellular services, television (TV), and Radar) during the receive
period (i.e., improve the receiver selectivity). The Band filter has a wider passband than that of a
Channel filter (e.g., BW= 15 MHz separating the Wireless Communications Service (WCS) from
Digital Audio Radio Service (DARS) frequencies).
Chapter 6 Installation
OL-16336-02