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NX100 Installation Manual Commissioning tasks
Page 9-6 Issue 3.2 2017-03-31
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 9-1 , Step 9 should be removed.
When the commissioning tests are successfully completed, connect the studio audio to the
transmitter's audio input connector, connect the RF output to its antenna system, and 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 # LX63) is installed on the RF
coaxial hardline at the transmitter’s output.
3. Turn the transmitter’s ac power back on.
4. Connect the desired modulation source to the transmitter (see Section 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 should not exceed 135% to minimize audio distortion
caused by signal clipping.
5. Use the AUI controls to begin transmitter operations. For detailed instructions, refer to the
NX100 Operating and Maintenance Guide.
WARNING:
If jumpers are placed between interlock terminals TB1-1/2 and TB1-3/4
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 and the
antenna system if the transmitter is turned on.