RADIOBEACON TRANSMITTER
ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE
Page 3-1
15 September 2003
SECTION 3
INSTALLATION AND PREPARATION FOR USE
GENERAL
3.1
This section contains the information
required to prepare the equipment site to receive the
transmitter and the information required to unpack,
install and prepare the transmitter for use.
TEST EQUIPMENT
3.2
The test equipment required for initial
installation is listed in table 1-2.
SITE REQUIREMENTS
3.3
The transmitter is designed to be installed
on drawer slides in a standard 19-inch mounting rack.
There should be a minimum clearance of three feet at
the mounting rack.
3.3.1
LIGHTNING/SAFETY GROUND
: The
transmitter site must contain a lightning/safety
ground system to protect the transmitter from
lightning-induced voltage transients. Refer to the
Lightning Protection
appendix of Nautel’s
Recommendations for Transmitter Site Preparation
manual.
3.3.2
ANTENNA SYSTEM
: The antenna
system must present a 50 ohm unbalanced load to the
RF output of the transmitter with a maximum SWR
of 1.2:1. Provision to protect the transmitter from
lightning induced voltage transients must be
incorporated in the antenna system. Refer to the
Lightning Protection
appendix of Nautel’s
Recommendations for Transmitter Site Preparation
manual.
3.3.3
ELECTRICAL POWER
: The
transmitter will operate from an AC power or DC
power source.
3.3.3.1
AC Power Requirements
: The
transmitter is configured during manufacture to
operate from one of two AC voltages. The standard
options available are: 115 volt RMS, line-to-neutral,
60Hz, single phase or 230 volt RMS, line-to-neutral,
50Hz. The mean AC voltage may be from 95 to 125
VAC for 115 VAC power sources or from 190 to
250 volts RMS for 230 volt AC power sources,
provided the mean voltage does not vary by more
than ten percent. The AC power source must be rated
at a minimum of 350 volt-amperes. Provision must
be made to protect the transmitter from lightning
induced voltage transients. Refer to the
Lightning
Protection
appendix of Nautel’s
Recommendations
for Transmitter Site Preparation
manual.
3.3.3.2
DC Power Requirements
: The DC power
source must provide a nominal 24V or 48V with a
constant current capacity of 12.8A (for 24V sources)
or 5.6A (for 48V sources). When a 24V battery is
used, a 24-48V power supply (A10) is in-circuit to
boost the DC voltage. The no-load voltage of the DC
power source must be in excess of 44.0V (or 22.0V
for 24V sources) for the transmitter to turn on
initially. The capacity of the DC battery bank will
dictate the length of time the transmitter will operate.
When the battery bank voltage has decayed to less
than 42V (or 21V for 24V sources), the transmitter
will turn off and prevent the batteries from fully
discharging. It is recommended that the DC power
source be separately fused.
3.3.4
ELECTRICAL POWER CABLING
: A
two-meter (six-foot) cable that mates with the AC
power receptacle of the transmitter is provided.
When the transmitter is configured for 115 volt
operation, a moulded 115 volt AC plug will be
installed on the cable. When the transmitter is
configured for 230 volt operation, the user must
obtain and install an appropriate 230 volt AC plug.
DC power cabling must be provided by the user. The
DC power cabling connects to terminals (TB2-1 and
TB2-2) on the remote interface PWB (A11) at the
rear of the transmitter.
3.3.5
RF OUTPUT CABLE
: The RF output
cable is connected to a type ‘N’ coaxial connector
which is located on the harmonic filter at the rear of
the transmitter.
