Nautel NG1000, Troubleshooting Manual

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NG1000 Troubleshooting Manual List of terms
Issue 0.4 2010-10-12 Page 6-1
Section 6: List of terms
This section defines some of the terms that are used in Nautel documentation.
Cutback.
A reduction in RF output power, caused by the occurrence of multiple shutbacks within a
pre-defined period.
DSP.
Digital Signal Processing.
EEPROM.
Electrically Erasable Programmable Read-Only Memory.
Foldback.
A reduction in RF output power, caused by adverse load conditions (high VSWR). No
shutbacks or cutbacks have occurred.
Intermediate Power Amplifier (IPA).
Refers to circuitry within the transmitter’s RF power
modules which amplifies the exciter's RF output to a level sufficient to drive the final RF amplifiers.
LED.
Light Emitting Diode (also referred to as lamp).
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.
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.
UI.
The User Interface is the front panel display on the system controller that allows for extensive
control and monitoring of the transmitter system.
VFD.
Vacuum Fluorescent Display.
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.