Application Guide

10 Spectrum 17
7signal Ltd, Panuntie 6, FI-00620 HELSINKI, FINLAND, [phone], [e-mail], www.7signal.com
7signal Sapphire Loupe User Guide Release 3.0
10 SPECTRUM
The spectrum analysis is an interactive troubleshooting tool in Sapphire, and is most useful
when used in Carat. Loupe displays the spectrum analysis results from the chosen time span to
assist you in continuous monitoring.
In all of the spectrum charts, the swept frequency band lays on the x-axis. The band
constitutes of the 256 WLAN subcarrier channels that are mapped to frequencies and WLAN
channels, as described in below table:
Subcarrier
36
51
66
81
96
111
126
141
156
171
186
201
216
Frequency
2.412
2.417
2.422
2.427
2.432
2.437
2.442
2.447
2.452
2.457
2.462
2.467
2.472
Channel
1
2
3
4
5
6
7
8
9
10
11
12
13
10.1 Over period chart
Loupe displays the spectrum analysis results from the chosen time span to assist you in
continuous monitoring. In the “over period chart”, Tthe signal level is plotted on the y- axis,.
and each antenna is represented by an individual chart. The swept frequency band is on the x
axis. If you select several Eyes, the results will be displayed individually for each Eye. To help to
plot signal levels to the actual WLAN channels (1-13), you can activate the “Add arcs for
channels”-checkbox. This selection adds parabolic lines to the chart to show the location of the
selected channel numbers.
10.2 Time-axis chart
Time-axis chart plots the measurement time to the y-axis. Each antenna is represented by an
individual time-axis chart. If you select several Eyes, the results will be displayed individually
for each Eye.