100 Chapter3
Making EDGE (with GSM) Measurements
Making the Tx Band Spur Measurement
The mean transmit power is measured first using the
“power-above-threshold” method (see the Transmit Power
measurement for detail), and then used as a reference for the
measurement limit lines if limits are used. The spectrums, which are
below or above the carrier frequency and within the transmit band, are
measured.
For each spectrum segment, the measurement looks for the spectrum
peak closest to the limit and saves the data. The peak of all segments is
reported as the Worst Spur. The amplitude difference from the peak to
the limit line (∆ from Limit), and from the peak to the mean transmit
power (∆ from Carrier) are displayed. The frequency difference from the
peak to the carrier frequency (Offset Freq) is also displayed. If the peak
goes above the limit line, the display will indicate FAIL. If Marker is on,
the active marker is placed at the peak of the displayed segment.
Making the Measurement
NOTE The factory default settings provide a GSM compliant measurement.
For special requirements, you may need to change some of the settings.
Press
Meas Setup, More (1 of 2), Restore Meas Defaults at any time to
return all parameters for the current measurement to their default
settings.
Select the desired transmit band, (P-GSM, E-GSM, R-GSM, GSM 450,
GSM 480, GSM 850, DCS 1800, or PCS 1900), as described in the
section “Changing the Mode Setup” on page 18. Select the desired
ARFCN and center frequency as described in the section “Changing the
Frequency Channel” on page 24.
Press
Measure, Tx Band Spur to immediately make Tx Band Spur the
active measurement.
To change any of the measurement parameters from the factory default
values, refer to the “Changing the Measurement Setup” section for this
measurement.
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