3 Short-Range Comms & IoT Mode
3.3 LoRa (CSS) Demodulation Measurement
3.3.2.3 AF Spectrum
The demodulated signal is displayed in the frequency domain on this window. Both
the abscissa and the ordinate are frequency. The unit of the ordinate varies from Hz
to dBHz depending on the type of the Y scale.
The frequency range and the resolution BW of this trace are settable.
If the frequency value of a point on the trace is greater than the channel BW/2, the Y
of the point will be set to 1.0E-50.
3.3.2.4 RF Envelope
The RF envelope is displayed on this window. The abscissa is time, and the ordinate
is amplitude. The Y axis is scaled in log and its unit is dBm.
The burst being analyzed will be highlighted with colored bars to schematically
illustrate the types of symbols locating in each colored portions of the burst.
Legend:
Cyan: programed preamble symbols/ fine sync symbols.
Green: custom sync symbols.
Gold: inversed preamble symbols.
Red: header symbols.
Light Gray: payload symbols.
When the synchronization fails after the burst detection succeeds, the whole
detected burst will be highlighted with a pink bar, as shown on the following
graphic.
318 Short Range Comms & IoT Mode User's &Programmer's Reference
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