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A upper limit and a lower limit are needed to be set to use this function.
Also, another parameter needs to be set to determine whether the value
inside or outside the interval would be left after filtering. For instance,
upper/lower limit is set to 99% and 1%, outside interval left, consequently only
those signal less than 1% or more than 99% time occupancy would be left
after filtering.
d. Amplitude Gap
Defines how many dB lower must the bottom between two peaks be,
when compared to the lower peak. If there is no bottom that fits this criterion
present between two peaks, KC908 would recognize these two peaks as one
signal.
This function is meant to prevent logging wideband signals, especially
those with a flat top (like CDMA), as multiple signals mistakenly.
The recommended value is 6dB. This value could be properly increased if a
modulated signal with multiple peaks resulting in repetitions appears. But
this parameter must be smaller than the signal noise ratio. If all the signals are
so weak that the noise background is less than 20dB from the peak and the
parameter is 20dB, then only the largest peak would be logged.
Altering this parameter while logging would NOT delete those logged
results that fail to fit the new criteria.
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