500 WATT RADIOBEACON TRANSMITTER
ND2000A-02X-xx0
Page
3-12
15 January 2005
(g) Mate connector P7, which terminates a
cableform flying lead, with connector J2 of
exciter module A5.
(h) Mate connector P8, which terminates a
cableform flying lead, with connector J1 of
exciter module A5.
(i) Mate BNC coaxial connector P19, which
terminates coaxial cable from modulator/ power
amplifier module A2, with BNC coaxial
connector A4J2 of exciter module A4.
(j) Mate BNC coaxial connector P20, which
terminates coaxial cable from modulator/ power
amplifier module A2, with BNC coaxial
connector A4J2 of exciter module A5.
3.10.2 EXTERNAL
INPUT/OUTPUT
INTERFACE CONNECTIONS:
Connect the
external input/output wiring to the transmitter as
depicted in figure 3-2, observing the following: See
figure MD-1 to locate the terminal boards and to
figure MD-29 for additional detail.
NOTE
The external control/monitoring cable must be strain-
relieved by clamping at cabinet entrance, using a
suitable cable clamp. Install blanking plugs in all
unused cable entry holes.
(a) Route the external input/output interface
cable(s), through the most appropriate cable
entry hole (top of cabinet), through the
appropriate ferrite ring(s) and terminate on their
respective terminals on interface panel barrier
strips TB3 and TB4, (barrier strips TB3/TB4 are
accessible through the rear section of the
transmitter cabinet).
(b) Using figure 3-2 to determine the final
destination of each conductor, cut each
conductor to its required length.
(c) Remove approximately 0.5 inches of insulation
from the end of each conductor. Terminate each
conductor with an appropriate terminal lug for a
#6 screw.
(d) Connect the input/output conductors to the
appropriate terminals of barrier strips TB3 and
TB4 using figure 3-2 as a guide.
3.10.3
RF OUTPUT CABLE CONNECTION:
Install the RF output coaxial cable as follows:
(a) Route the RF output coaxial cable to type
N
coaxial connector J1, which is located on the top
cover of the transmitter cabinet.
(b) Cut the RF output coaxial cable to the required
length. Install a type
N
coaxial connector on the
cable and connect the coaxial cable to RF output
connector J1.
3.10.4 LIGHTNING/SAFETY GROUND
CONNECTION:
Connect a continuous, insulated 4
AWG copper wire or one-inch copper braid, from the
station lightning/safety ground system, directly to the
safety ground connection at the top of the transmitter.
Ensure the conductor wire does not contact any other
metal surface of the chassis or cabinet.
3.10.5
AC AND DC POWER CONNECTION
(see figure MD-38): Connect the ac power cabling,
and if applicable, the dc power cabling as follows:
NOTE
The ac and dc power source cables must be strain-
relieved by clamping at cabinet entrance, using
appropriate cable clamps.
(a) Switch off transmitter's ac power source at
service entrance.
(b) Remove appropriate (smaller) knockout from
lower, right-hand, cable-entry.
(c) Install cable clamp provided in ancillary parts
kit in cable-entry hole.
(d) Route wiring from ac power source through
cable clamp, installed in step (c), to vicinity of
barrier strip TB1.
(e) Connect ac power source conductors to barrier
strip TB1 as follows:
