User Manual

Services
99-137719-D Confidential - For internal use 12-11
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Use cases
12.6 Services
12.6.1 Spectrum analyzer (spectrum measurement)
This use case illustrates how the internal spectrum analyzer is configured and
activated to generate an FFT spectrum of a received forward signal. The use case
assumes that the BGAN XL Radio Module has already been brought into an active
service mode and a signal has been injected at Rx1 at 1550.01 MHz.
The following example illustrates how a simple spectrum measurement is
accomplished (substitute the IP address, if non-standard IP address is used):
1. First ensure that no other service-related functions are active.
2. Set the span to 2 MHz, the centre frequency to 1550 MHz, the number of averages to
100, the window type to Hanning and the gain to -1.00 dB by filling the appropriate
boxes at http://192.168.1.1:8080/fft/ and clicking Save All
3. Instruct the spectrum analyzer to perform the FFT/measurements by clicking Run
Spectrum followed by Refresh Spectrum
4. Now the measured spectrum can be visually inspected
5. You can find additional measurements at http://192.168.1.1:8080/fft/fft_data, which
contains information similar to:
<header>
<dbm_offset>49.080</dbm_offset>
<channel_power>
<rx1>-78.281</rx1>
<full_scale>-29.201</full_scale>
</channel_power>
<peak_power>
<rx1>-78.296</rx1>
<full_scale>-29.216</full_scale>
</peak_power>
<peak_freq>10000.000</peak_freq>
<noise_floor>
<rx1>-165.577</rx1>
<full_scale>-116.497</full_scale>
</noise_floor>
<c_no>87.282</c_no>
<phase_noise>-33.799</phase_noise>
<centre_freq>1550000000</centre_freq>
<peak_x>10.000</peak_x>
<spur1>
<freq>9000.000</freq>
<power>-86.077</power>
</spur1>
<spur2>
<freq>11000.000</freq>
<power>-86.092</power>
</spur2>
<spur3>
<freq>-237000.000</freq>
<power>-116.751</power>
</spur3>
<spur4>
<freq>-238000.000</freq>
<power>-116.778</power>
</spur4>
<rbw>1000.000</rbw>
<scaling>