Specifications

Chapter 12 109
Using Segmented Sweep (ESA-E Series Spectrum Analyzers)
Using Segmented Sweep to Monitor the Cellular Activity of a cdmaOne Band
Using Segmented Sweep (ESA-E
Series Spectrum Analyzers)
Step 7. Locate the frequency of the cdmaOne signal with a marker:
Press
Marker, then rotate front-panel knob.
Notice that in this example, there are two cdmaOne carriers located at
882.23 MHz, as shown in Figure 12-4.
Step 8. Set the center frequency of segment 3 to 882.23 MHz:
Press
Sweep, Segmented, Modify, Edit, Segment, 3, Enter.
Press
Center Freq, 882.23, MHz.
Step 9. Set the span to greater than twice the cdmaOne bandwidth (2 times
1.2288 MHz) since there are two cdma carriers side-by-side:
Press
Span, 2.7, MHz.
Press
Res BW, 10, kHz.
Step 10. Set trace 1 to maximum hold and set trace 2 to minimum hold:
Press
Trace/View, Trace 1, Max Hold.
Press
Trace/View, Trace 2, Min Hold.
Figure 12-5 Monitoring Cellular Bands in Segmented Sweep
Figure 12-5 displays the results of this setup over an extended period of
time. As expected, the minimum hold trace of segment 1 shows no
continuously present carriers. This is indicative of cellular activity. If a
persistent signal exists, it may represent the presence of an interfering
carrier. In this example, segment 3 shows continuous transmission of
the carrier without interference.