Anritsu S331E, Руководство пользователя

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Site Master User Guide PN: 10580-00252 Rev. K C-1
Appendix C — Glossary of Terms
C-1 Introduction
The following terms are related to this product and technology.
C-2 Glossary
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.
ADC :
Analog-to-Digital Converter (ADC, A/D or A to D) is an electronic device
that converts continuous signals to discrete digital numbers. The
reverse operation is performed by a digital-to-analog converter (DAC).
ADC can uniquely represent all analog input values within a specified
total input range by a limited number of digital output codes. Refer also
to DAC.
Analog System :
An Analog system uses an analog transmission method to send voice,
video and data-using analog signals, such as electricity or sound waves,
that are continuously variable rather than discreet units as in digital
transmissions. Mobile analog systems include AMPS, NMT and
ETACS.
Analog
Transmission :
Analog Transmission refers to signals propagated through the medium
as continuously varying electromagnetic waves.