Nautel NX50, Руководство по установке

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NX50 Installation Manual Commissioning tasks
Page 9-6 Issue 6.1 2021-07-13
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 BNC
connector (J7). The RF monitor level is factory set for 5 Vrms. Ensure
there is sufficient 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 (AES1), J10 (AES2) or J12
(balanced 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. Use the modulation monitor to verify that the RF output's modulation envelope is
acceptable.
6. Set the output level of the audio signal generator to zero (off).
7. Turn off the RF power stage: press
RF Off
. The
RF Off
button will turn red and the
Rf
On
button will turn grey.
8. Disconnect the audio signal generator from J11 or J12 on the control/interface PWB.