Nautel VS2.5, Руководство по установке

Страница: 54 / 56

VS2.5 Installation Manual List of terms
Page 11-2 Issue 11.0 2019-05-10
Preset.
A setting that controls power level, frequency and audio parameters. The VS2.5 allows
you to pre-program multiple presets.
PWB.
Printed Wiring Board.
Shutback.
A complete, but temporary loss of RF output power, caused by any one of a
variety of faults, including high VSWR, high reject load power, RF drive failure, or an open
external interlock.
Shutdown.
A complete and permanent loss of RF output power. Typically follows repeated
cutback, foldback or shutback events.
SPI.
Serial Peripheral Interface. A synchronous serial data link standard that operates in full
duplex mode. Devices communicate in master/slave mode where the master device initiates the
data frame. Multiple slave devices are allowed with individual slave select (chip select) lines.
Also referred to as a "four wire" serial bus.
Surge protection panel.
An electrical panel that protects equipment from electrical surges in
the ac power supply, antenna or site ground caused by lightning strikes.
VSWR.
Voltage standing wave ratio. This is an expression of the ratio of forward voltage to
reverse voltage on the feedline and antenna system. An ideal VSWR of 1:1 provides maximum
transmitter-antenna efficiency.