RADIOBEACON TRANSMITTER
ND500II (125 WATTS) DOUBLE SIDEBAND - NO VOICE
Page 3-8
15 September 2003
(b)
Using figure 3-2 to determine the final
destination of each conductor, cut each
conductor to its required length to allow
connection to terminals of A11TB1 or for
termination in a 25-pin, ‘D’ type connector.
(c)
For connection to A11TB1, remove 0.5 inches
of insulation from the end of each conductor.
Connect the input/ output conductors to the
appropriate terminals of terminal block
A11TB1 using figure 3-2 as a guide.
3.9.2
ANTENNA TUNING UNIT
CONTROL CONNECTIONS
: If a Nautel series
automatic antenna tuning unit is used in the antenna
system, a five-conductor, shielded control cable must
be connected between the transmitter and the antenna
system. Connect the conductors of the antenna
tuning unit control cable to the terminals of terminal
block A11TB1, or to D-connector A11J4 as
identified in figure 3-2.
3.9.3
RF OUTPUT CABLE CONNECTION
:
Install the RF output coaxial cable as follows:
(a)
Route the RF output coaxial cable to RF output
coaxial connector A7J2 which is located on
harmonic filter assembly A7, at the rear of the
transmitter.
(b)
Cut the RF output coaxial cable to the required
length. Install a type 'N' coaxial connector and
connect it to RF output connector A7J2.
3.9.4
LIGHTNING/SAFETY GROUND
CONNECTION
: Connect a continuous, insulated
4AWG copper wire or one-inch copper braid, from
the station lightning/safety ground system, directly to
the safety ground connection at the rear of the
transmitter. Ensure the conductor wire does not
contact any other metal surface of the chassis or
cabinet.
3.9.5
AC POWER CONNECTION
: Connect
the AC power as follows:
(a)
Switch off transmitter AC power source at
service entrance.
(b)
Obtain the AC power cable from the ancillary
parts kit.
(c)
If the transmitter is configured to operate from
230 volts AC; remove the 15 ampere, 115 volt
ac, 60Hz power plug from the service entrance
end of the AC power cable and install an
appropriate 230 volt AC power plug.
(d)
Connect the female plug to the mating
receptacle (U2) at the rear of the transmitter
and insert the male plug into the applicable AC
power receptacle.
3.9.6
DC POWER CONNECTION
: Connect
the DC power source (battery), if applicable, as
follows:
(a)
Connect the wires that originate from the
+
and
−−
outputs of the DC power source to terminals
TB2-1 (+) and TB2-2 (
−
) of remote interface
PWB A11 at the rear of the transmitter.
3.9.7
FINAL PRE-STARTUP
INSPECTION
: When the transmitter installation is
completed, perform a final inspection prior to apply
power, as follows:
(a)
Verify the requirements of paragraphs 3.9.1
through 3.9.6 are completed
(b)
Perform a general visual inspection for loose or
damaged parts. Pay particular attention for
foreign objects and loose or disconnected
electrical connections.
INITIAL START-UP PROCEDURES
3.10
Initial start-up procedures and subsequent
calibration and testing of the transmitter is performed
in three stages.
NOTE
The transmitter was fully tested during manufacture
and subjected to a minimum burn-in period of forty-
eight hours.
3.10.1
The first stage consists of a complete
visual inspection, a complete calibration/minimum
performance test, with the transmitter operating into
a precision, 50-ohm, resistive, dummy load, to ensure
the transmitter is serviceable and operating within
design parameters.
