V10/V7.5/V5/V3.5 Installation and Operation Manual
Page
2-21
Section 2 Preparation for Use and Installation
Issue 3.5
2.3.7.1 M50 Exciter(s)
NOTE
Only an internally mounted Nautel M50
exciter may be used for IBOC operation.
(a) From the front of the transmitter,
install the exciter(s) in their mounting
drawer slides, located above the
switching power supply modules.
(b) At the back of the transmitter, plug the
following connectors into the back of
the exciter(s):
•
ac power cord(s) (P66 for A14 and P67
for A15, if used) into the
AC INPUT
receptacle(s).
•
37-pin D-sub plug(s) (P68 for A14 and
P69 for A15, if used), into the
REMOTE INTERFACE
receptacle(s).
•
RF output BNC plug(s) (W1P1 for A14
and W2P1 for A15, if used) into the
RF
OUT
BNC receptacle(s).
•
For analog operation only:
Analog
input from an external AES/EBU
source, to the
INPUT AES/EBU
XLR
connector.
•
For IBOC operation only:
IBOC input,
via a LAN connection, to the
LAN/
EXPORTER INPUT
RJ45 connector.
•
For IBOC operation only:
Serial link
Cat 5e cable plug(s) (W93P2 for A14
and W94P2 for A15, if used) into the
XMTR LINK
receptacle(s).
•
For IBOC operation only:
Exciter RF
sample BNC plug(s) (P71 for A14 and
P73 for A15, if used), and optional
inline BNC attenuators, into the
RF
SAMPLE INPUT
BNC receptacle(s).
•
For IBOC operation only:
Connect a
10 MHz reference, from an external
GPS source (e.g., Exporter), to the
GPS INPUT 10 MHz
BNC connector.
(c) Connect the program input to the
appropriate exciter input, as detailed
in the M50
Installation and Operation
Manual
. After making any necessary
program input adjustments, secure
the exciter(s) using four front panel
screws located in a bag attached to
the exciter(s).
NOTE
Route exciter program cables through a
ferrite toroid, provided with the exciter’s
ancillary kit, to the rear of the exciter(s).
(d) For external exciter mounting, consider
the following:
•
Connect a coaxial cable between the
exciter’s
RF OUT
BNC and J1 (exciter
A) or J2 (exciter B) of RF drive splitter/
changeover assembly A16 (see
Figure MD-3 of the
Repair Manual
).
•
Connect each exciter’s RF mute
(safety interlock) control to the
transmitter’s exciter interlock control,
using a single-conductor, shielded
wire (user supplied). The exciter
interlock controls are available on the
EXC A
and
EXC B
terminals of TB2
on the remote interface PWB (A44).
Nautel exciters require an open
contact for normal operation. For
exciter A (A14), connect the centre-
conductor to TB2-2 and the ground to
TB2-3. For exciter B (A15, if used),
connect the centre-conductor to
TB2-5 and the ground to TB2-6.
Install the other ends of the RF mute
wires from step (b) in a 37-pin D-sub
plug (Nautel Part # JS52, located in the
blank exciter kit) with the centre-
conductor at pin 21 and the shield at
pin 20. Next, mate the plug with the
REMOTE INTERFACE
receptacle on
the exciter rear panel. A connector
shell (Nautel Part # JS36) is also
available in the blank exciter kit.