NV30/NV40 Operations and Maintenance Manual List of terms
Page 5-2 Issue 3.3 2014-12-10
Preset. A setting that controls power level, frequency and audio parameters. The NV30/NV40
allows you to pre-program multiple presets.
PWB. Printed Wiring Board.
SBC. Single Board Computer. Refers to the CPU and associated components located on the back of
the transmitter’s front door.
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.
TCP. Transmission Control Protocol. This is a connection based message delivery protocol that
provides error-checked delivery of a stream of data.
UDP. User Datagram Protocol. This is a connectionless based data delivery protocol that doesn't
provide error-checked delivery acknowledgement.
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.
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