NX300 Installation Manual
Commissioning tasks
Issue 3.0 2012-11-01
Page 10-3
8. Check the output of the +48 V power supply on the AUI (
Meters
,
Rack 1
).
9. Check for alarms using the
Transmitter Status
page of the AUI.
10. Increase the power to normal operating levels while monitoring the PA voltage. Ensure the
PA voltage remains within specification [that is, Sqrt(Pout/
300
,000 W)*167 V * 400 V/B+
Voltage = PA Volts within 10%].
11. Check the reflected power level. It should be near 0 W.
12. Set up preset modes. See the
NX300 Operating and Maintenance Manual
.
13. Set the correct time and date on the AUI display. See the
NX300 Operating and Maintenance
Manual
.
14. To improve overall system security, change the login password for the AUI display. Nautel
factory sets the AUI with a default login password. See the
section of
the
NX300 Operating and Maintenance Manual
.
Modulation checks
Verify that the RF output is appropriately modulated when audio is applied:
1. Connect an appropriate modulation monitor to the control/interface PWB’s
RF MONITOR
connector (J7). The RF monitor level is factory set
.
Ensure there is
suffiecient attenuation
installed between the
RF MONITOR
connector and the modulation
monitor.
2. From the AUI’s Presets menu, select the desired preset and verify the
AM Source
is set for
your audio signal generator.
3. Verify that an audio signal generator is connected to J11 (AES) or J12 (analog) on the
control/interface PWB, and that its output is preset to 1,000 Hz at a zero output level
(turned off).
4. Turn on the audio signal generator and increase the output level of the audio signal generator
until a modulation depth of 100% is attained, as indicated on the modulation monitor. The
audio signal generator's output level should be at the user-defined input level (e.g., 10 dBm)
set in the preset.
5. Verify that the RF output's modulation envelope is acceptable.
6. Set the output level of the audio signal generator to zero (turned off).
Summary of Contents for NX300
Page 2: ......
Page 4: ......
Page 8: ...NX300 Installation Manual Page viii Issue 3 0 2012 11 01...
Page 22: ...NX300 Installation Manual Completing cabinet assembly Page 3 8 Issue 3 0 2012 11 01...
Page 40: ...NX300 Installation Manual Adjusting the spark gap Page 7 4 Issue 3 0 2012 11 01...
Page 46: ...NX300 Installation Manual Installing audio inputs Page 8 6 Issue 3 0 2012 11 01...
Page 58: ...NX300 Installation Manual Parts and tools Page 11 4 Issue 3 0 2012 11 01...
Page 69: ......