Mode – Set to Spectrum Scan or Zero Span. Spectrum Scan mode provides plots of signal strength over
frequency. Zero Span provides a plot of power over time in a 20MHz Bandwidth (see Figure 64 Zero Span
Results below)
Spectrum Scan Mode:
Center Frequency – Specify the center frequency of the scan.
Span – Specify the span of the scan, centered on the center frequency. (e.g. Center freq of
2450MHz and span of 100MHz will scan 2400-2500MHz). A large span will take longer to
complete.
Antenna Mask – Choose which antenna on the radio to use for scanning. If there are 2 antenna
radios in the network antenna 1 or 2 must be chosen.
Resolution Bandwidth – Specify the RBW for the scan. A smaller RBW will provide a more detailed
plot, but will take longer to complete the scan. 625KHz is a good balance between scan detail and
time of scan.
Threshold – Specify the threshold for measurement of the duty cycle of interference.
Duration – Duration of each scan. A longer duration will provide better accuracy but will take
longer to complete.
Approximate time for scan – Approximate time that the network will be down for the scan to
complete.
5.3.1.2 Spectrum Scan Results
Figure 62 Spectrum Scan Results below shows the results from a scan of a network of 6 radios. The
checkboxes at the top allow users to show or hide plots from specific radios. The three plots provided are:
Average – Displays the average power over the time duration specified in the settings.
Peak – Displays the peak power seen at any point during the scan for each frequency. This is the equivalent
of the ‘Max Hold’ feature on common spectrum analyzers.
Threshold – Displays the duty cycle of interference stronger than the user specified ‘Threshold’ power. In
the example above, the threshold was set to 5dB. The plot is showing the percentage of time that the
measured power is more than 5dB above the radio’s noise floor.
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