S820E UG PN: 10580-00343 Rev. H C-1
Appendix C — Glossary
C-1 Introduction
This glossary provides definitions for common RF terms that may be
associated with the use of an S820E Site Master.
C-2 Glossary Terms
3 dB rule : The 3 dB rule provides a means to estimate relative
power values. A 3 dB gain indicates that power
increases to twice the power (a multiple of 2). A 3 dB
loss indicates that power decreases to half the power (a
multiple of 1/2). A system with 40 watts of input power
and a 6 dB insertion loss will have only 10 watts of
output power (a multiple of 1/2 for each 3 dB loss, or 1/4
of 40 watts).
Adapter : A fitting that supplies a passage between two sets of
equipment when they cannot be directly interconnected.
Adaptive Array
Antenna : Adaptive array antenna is a type of advanced ’smart’
antenna technology that continually monitors a
received signal and dynamically adapts signal patterns
to optimize wireless system performance. The arrays
use signal processing algorithms to adapt to user
movement, to changes in the radio-frequency
environment, and to multi-path and co-channel
interference.
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