User's Manual
351804-1 Rev. 100
COM5000-8 TECHNICAL MANUAL
10
2.1.4.4 External Connections to the Transmitter
All connections are routed through the cable entry brush strip located below the rear door.
AC LINE Input Connection
The External AC Line power cable connects to the terminal block inside a junction box at the bottom inside
floor of the cabinet. The recommended minimum wire size is #6 AWG (16mm
2
). The terminals will accept up
to #4 AWG (25mm
2
) wire.
The connections are labeled near the terminals:
L1: Line 1 (black)
L2: Line 2 (red)
L3: Line 3 (blue)
: Ground (green)
Note: Phase is not critical. Any AC line phase may be connected to any line terminal.
The power requirement is 3-phase/4-wires (3 lines and ground), 187 – 240 VAC, 47-63Hz.
The maximum AC input current is 50A/phase.
Antenna Connection
The antenna cable is connected to the LC connector located at the inside rear of the cabinet.
Remote Control Interface
Remote control of the transmitter is provided via an RS-232/RS-422 interface on the rear of the T-4180
exciter at J4. See the T-4180 manual for details.
Audio Connection
Two balanced 600 ohm audio inputs are provided on J6 of the Exciter rear panel. A microphone input with
PTT (push to talk) is also available on the front panel of the exciter. See the T-4180 manual for details.
External Reference
An external 10 MHz reference input is provided on J2 of the Exciter rear panel. See the T-4180 manual for
details.
Cabinet Ground Connection
An M6 (≈¼”) ground stud is located inside the lower rear of the rack cabinet (right side as viewed from the
rear) to provide connection to safety ground wiring.
CAUTION:
BEFORE OPERATING THE TRANSMITTER FOR THE FIRST TIME AFTER INSTALLATION
IS COMPLETE, DOUBLE CHECK THAT ALL CABLES ARE CORRECTLY INSTALLED.
SEVERE DAMAGE TO THE TRANSMITTER CAN OCCUR IF CABLES ARE NOT
CONNECTED OR ARE CONNECTED IMPROPERLY! IT IS HIGHLY RECOMMENDED THAT
INITIALLY TESTING BE DONE WITH THE POWER SET TO 10%. IF THE TRANSMITTER IS
OPERATING NORMALLY AT 10% POWER, THE POWER MAY BE GRADUALLY
INCREASED TO 100%. THIS PRECAUTION IS ALSO RECOMMENDED ANY TIME A
MODULE IS REPLACED.