When the software does not detect a Downlink short preamble in the burst, this message is displayed on the screen. All demodulation measurement results are cleared (“--” is seen in the result area). The short preamble is required for all demodulation measurements.
The short preamble is also required for the Power versus Time trace to be synchronized, but if the preamble is not present, then an unsynchronized time domain trace is displayed, and all data results are cleared except the Channel Power result. The instrument continues to check for the presence of the short preamble.
The Demodulation Error is displayed when the following conditions are
not met:
When Demod Type is set to
Auto, and the decoded information from the DL‑MAP indicates that the encoding type is not Convolutional Coding (CC), then this message is displayed because the instrument supports only Convolutional Coding at this time.
