82 Chapter3
Making EDGE (with GSM) Measurements
Making the Output RF Spectrum Measurement
Direct Time Break Freq - Selects the transition frequency (the first
offset frequency) where the Direct Time Domain method is used
instead of the FFT method.The Direct Time Domain offers a high
dynamic range and is faster for measuring at a few offset
frequencies. The FFT method has a moderate dynamic range
(generally sufficient when the RBW = 30 kHz). It is much faster
for measuring at many offset frequencies
Changing the View
If the Multi-Offset measurement has been chosen and the Meas
Type is Mod & Switch, pressing the
View/Trace key will allow you to
select the desired view of the current measurement. If the Meas
Type is Modulation, the
Switching Numeric view is unavailable. If the
Meas Type is Switching, the
Modulation Numeric view is unavailable.
If the Single Offset measurement has been chosen, the
Modulation
Numeric and the Switching Numeric softkeys are unavailable (grayed
out) as both modulation and switching results are always displayed.
Troubleshooting Hints
The Output RF Spectrum measurement, along with the Phase and
Frequency Error measurement, can reveal numerous faults in the
transmit chain, such as the I/Q baseband generator, filters & modulator.
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