SME Fitting the Options
1038.6002.02 1.10 E-13
Delay compensation
À Allow the SME to warm up.
À Connect the spectrum analyzer (see Section 5, item 2) to the RF
output of the SME.
À SME settings
- Menu FREQUENCY 836 MHz
- Menu LEVEL 0 dBm
- Menu DIGITAL MOD / DQPSK data source PRBS .
À Settings at the spectrum analyzer:
- Center frequency 836 MHz
- Span 300 kHz
- Resolution bandwidth 3 kHz
- Video bandwidth 100 Hz.
À Check spectrum
The spectrum should observe the following tolerance limits (the
reference level is at the center frequency)
Offset frequency Level
0 kHz 0 dB (reference level)
30 to 50 kHz < -40 dB
> 50 kHz < -50 dB
À Select DELAY in menu UTILITIES / CALIB / DQPSK.
À Adjust the delay such that the spectrum has symmetric spurious
sidebands which are as low as possible and observes the tolerance
limits.
Note: The delay data are stored in the RAM, thus the calibration
can be repeated as often as required.
If the value for the delay thus found is different from the DEFAULT
SETTING stored with R&S, the new value can also be transferred to
the EPROM (see note in Section 1.3.3, however)
À Select OVERWRITE DEFAULT SETTING in menu UTILITIES /
CALIB / DQPSK.
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