10/6/10 888-2629-200 4-43
WARNING: Disconnect primary power prior to servicing.
Section 4 Theory of Operation
Maxiva ULX COFDM Series
4.6.3.10.1 FET Bias
The LDMOS FET’s used in the Maxiva ULX pallets have been designed by the
manufacturer to maintain the factory bias characteristics without the need for re-biasing
in the field. The idle current for each FET is set at the factory to approximately 1 amp.
Variations between FET idle currents should be less than 10%.
4.6.4 Module Combiner
The module combiner is a compact, water cooled, hybrid combiner optimized to work
across the entire UHF frequency band from 470MHz to 860MHz. There are several
combiner configurations depending on the number of PA modules used in the cabinet.
Figure 1-2 on page 1-3 shows two 8-way PA module combiners (upper and lower with
one combiner for each half of the cabinet). The combiner is fed by the PA module
outputs.
To Next Page
Loading...
Need help?
General
