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PMP 400/430 and PTP 200/230 Series
3.5
SPECTRUM ANALYZER
A spectrum analyzer is available on the SM's Tools => Spectrum Analyzer page. The spectrum
analyzer is also available on an AP by temporarily converting it to an SM by setting the Device
Type to SM on the AP's Configuration => General page. The spectrum analyzer works like the
spectrum analyzer in classic FSK SMs.
Spectrum analyzer uses include:
Showing relative power levels (instantaneous and average) across the band, to aid in
selecting channels and performing RF planning.
Troubleshooting to finding the frequency, relative power level, and location of interferers
by rotating a single SM, or triangulating from multiple SMs in a geographical area.
Release 10.2 added a configurable setting on the Tools => Spectrum Analyzer web page to
display either instantaneous or averaging for spectrum analyzer results for the PTP 100 BHs and
PMP 430 5.8-GHz Series. Release 10.3 added this enhancement for the PMP 400/430 5.4-GHz,
PTP 200 BHs and PMP 100 Series.
The PMP 430 and PTP 230 Series uses average detector rather than peak detector algorithm
which results in ~10 dBm lower readings than PMP 400 Series and FSK which use peak
detectors. For example, when measuring power from an OFDM AP transmitting on a given
channel the PMP 430 5.8-GHz OFDM SM might show a Receive Power Level of -60 dBm while
a PMP 100 5.7-GHz FSK SM spectrum analyzer shows a power level of -53 for that channel.
Figure 23: PMP 430 spectrum analysis compared to FSK
In addition, an PMP 430 SM measures power across 5, 10 or 20-MHz channels (PTP 230
measures power across 10 or 20-MHz channels) while an FSK SM measures power across 20-
MHz channels, so power measurements are not directly comparable between the two. For both
FSK and OFDM, the receiver's channel bandwidth has been added to the display. This is
important to note as the width of the OFDM channel (5, 10 or 20MHz) affects the bandwidth data
of the spectrum analyzer sample.
Issue 6.0 May 2011
Motorola PMP Solutions User Guide Supplement
Page 37 of 77
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