User Manual

MM102225V1, Rev. B
53
6.6 TRANSMIT DEVIATION (MANDATORY)
Objective: The objective of this test is to ensure that the transmit deviation is correctly
adjusted.
STEPS ACTION MISCELLANEOUS
1.
Verify that the HPA transmit Enable/
Disable switch is set to the Disable
position for all HPA’s.
2.
Select the RF GEN screen and set the
Amplitude field to Off by pressing the
ON/OFF / (YES) key.
3.
Select the AF Analyzer Screen on the
HP 8920 and configure the following
parameters:
• Set AF Analyzer to “FM Demod”
• Set the Detector to “Pk+ - /2”
• Set FM Deviation to Ave 10
Samples.
4.
Set the following configuration
parameters on the RF Analyzer screen:
Tune Mode: Auto
Tune Frequency: Set for the RF path
under test.
Input Port: RF In
Sensitivity: Normal
IF Filter: 230KHz
5.
Set the HPA Enable/Disable switch to
the Enable position.
6.
The measured value of FM Deviation
should be 3.0 kHz ±150 Hz for the
channel under test. Measure and record
the indicated FM Deviation on the
recorded data sheet
13
.
7. Disable the HPA.
8. Repeat for each RF path.
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Refer to APPENDIX L - RECORDED DATA SHEET.