Wavecom W74PC V8.7.0 - Manual (Page 92)

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Analysis Tools WAVECOM Decoder W74PC, W-PCI/e, W-CODE, W-CLOUD Manual V8.7.0
The upper and lower frequency boundaries of the signal is selected with the right and left cursor. With the
center cursor, the center frequency may be set more precisely. The precision of the center frequency is
very important and directly influences the performance of the decoder.
After every change, the center frequency is automatically updated and the bandwidth of the signal is set
according to the received mode.
Options can be set using the right mouse button or the context menu (see “ FFT/Sonagram Context Menu ”
on page 71). It is possible to remove the tuning FFT or Sonagram in the View Menu.
FFT and Sonagram
This analysis tool combines real-time FFT and sonagram analysis modes.
Detailed information for each of the analysis tools can be found in the corresponding descriptions, see
“
FFT ” on page 80 and “ Sonagram ” on page 83.
Options can be set using the right mouse button or the context menu (see “ FFT/Sonagram Context Menu ”
on page 71). It is possible to remove the tuning FFT or Sonagram in the View Menu.
Waterfall
The waterfall analysis produces a three dimensional display of FFT spectra over time, frequency and am-
plitude. The waterfall display aggregates many single measurements to 40 displayed spectra. An updated
measurement in the two-dimensional real-time FFT display only shows a fraction of the data, depending
on the modulation method. In contrast the FFT waterfall display also displays data in the time domain
A time histogram is displayed on the left-hand side of the display.
By clicking on the graph, the display will be paused and measurement cursors appear.