Nautel NX10, Installation Manual

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NX10 INSTALLATION MANUAL COMMISSIONING TASKS
VERSION 2.0 2016-05-06 PAGE 2.8.9
Going On-Air
IMPORTANT:
Before going on the air, if you want the safety interlocks to operate properly, the
shorting jumpers installed in “Pre-Commissioning Tasks” on page 2.8.1 , Step 3 should be removed and
the antenna system’s interlock should be installed.
When the commissioning tests are successfully completed, connect the studio audio to the transmitter's
appropriate audio input connector, follow the steps below to go on-air, and then
complete any emission
tests that are required.
1. Turn off the power using the ac disconnect switch, if one is being used, or else at the ac source.
2. Connect the transmitter's RF output to an antenna system (or verify that the current connection is
intact). Ensure that a ferrite toroid (Nautel Part # LP23) is installed on the RF coaxial hardline at the
transmitter’s output.
3. Turn on the transmitter’s ac power.
4. Connect the desired modulation source to the transmitter (see Section 1.7, “Planning audio
inputs” of the Pre-Installation manual for connection options).
NOTE
: If analog modulation is being applied, it is recommended that negative modulation peaks
do not exceed -96% and positive peaks do not exceed
140
% to minimize audio distortion caused
by signal clipping.
5. Use the front panel UI controls to begin transmitter operation. For detailed instructions on using
the front panel UI or the remotely accessible advanced user interface (AUI), refer to the
NX10
Operation & Maintenance Manual.
6. Check the four LEDs on the left-hand side of the front panel UI. They should all be green, indicating
normal operation. If not, check for alarms by navigating to the front panel’s Main Menu -> View
Status -> View Alarms screen and consult the NX10 Troubleshooting Manual for detailed
information on each alarm.
WARNING! IF A JUMPER IS PLACED BETWEEN INTERLOCK PINS J6A-19 AND
J6A-20 ON THE CONTROL/INTERFACE PWB, SAFETY FEATURES CONTROLLED
BY THE EXTERNAL INTERLOCKS WILL BE DISABLED. A FAIL-SAFE METHOD
OF ALERTING PERSONNEL TO THIS FACT SHOULD BE IMPLEMENTED.
VOLTAGES WHICH ARE DANGEROUS TO LIFE WILL BE PRESENT ON THE RF
OUTPUT STAGES IF THE TRANSMITTER IS TURNED ON.