4-12
888-2685-001
12/24/07
WARNING: Disconnect primary power prior to servicing.
Ranger Commissioning Manual
Section 4 RF Testing
4.2.12.4 Non-Linear Precorrection Procedure
Step
Procedure Description
Expected Observation
1
Configure the transmitter to
operate on air with Exciter A
with precorrector settings to:
Non-Linear Precorrection =
ADAPT
Linear Precorrection = BYPASS
Then connect the spectrum
analyzer to the transmitter
output directional coupler
forward port.
RF Spectrum output should be
clean.
2
Configure the spectrum analyzer
as follows:
Center Frequency = 719 MHz
Span = 10 MHz
Resolution BW = 30 KHz
Video BW = 300 Hz
Sweep = Auto
Sweep Points = 10001
Amplitude Reference Level = 10
dB
Amplitude Attenuation = 30 dB
3
Measure shoulders level at Fc +/
- 3.0 MHz with Exciter A
Shoulders level < -36 dB
4
Measure shoulders level at Fc +/
- 3.0 MHz with Exciter B
Shoulders level < -36 dB
5
Repeat steps 3-4 with the
spectrum analyzer configured as
follows:
Start Frequency = 698 MHz
Stop Frequency = 746 MHz
Resolution BW = 30 KHz
Video BW = 300 Hz
Sweep = Auto
Sweep Points = 10001
Amplitude Reference Level = 10
dB
Amplitude Attenuation = 30 dB
Results should be consistent with
those from steps 3-4
.
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