Nautel NX5 AM, Preinstallation Manual

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NX5 PRE-INSTALLATION MANUAL DESCRIPTION
VERSION 0.1 2015-08-01 PAGE 1.1.1
SECTION 1.1: DESCRIPTION
This section provides a basic description of the NX5 transmitter and includes the following topics:
 Capabilities
 Options - see page 1.1.3
Capabilities
Power
The NX5 is capable (with 130% positive peak modulation) of up to 5.5 kW of RF carrier power. The
maximum continuous average power (carrier plus modulation) is 7.5 kW (corresponding to 5 kW of
carrier power with 100% continuous tone modulation); the NX5 is capable of operating indefinitely at
this power level.
The operator can vary the power continuously or switch to preset power levels using the NX5 front
panel UI or the remote advanced user interface (AUI). Changes in power output can also be scheduled
to correspond with authorized daytime power levels.
Modulation
The NX5 is capable of double sideband (AM) modulation. With the addition of an optional internal
signal generator, IBOC modulation can be provided to the exciter. DRM modulation can be provided to
the exciter with an external modulator that produces I/Q over AES.
Antenna Tolerance
The NX5 will operate at rated power with a VSWR of up to 1.5:1. A higher VSWR results in a protective
reduction of output power. The greater the VSWR, the greater the reduction in RF power. (To maintain
the quality of digital broadcasts, lower VSWR levels are required. See
“Antenna System” on page 1.6.4 .)
The NX5 will not fail or completely shut down, regardless of antenna or feedline failure.