The measurements for Occupied Channel
Bandwidth are performed at normal environmental conditions and on those channels and
channel bandwidths specified in the Limits on Nominal and Occupied Channel
Bandwidth table in CE Regulations for SRDs Operating in License-Free 2.4 GHz/5 GHz
Bands [1]. The test results comply with the limits shown in the Limits on
Nominal and Occupied Channel Bandwidth in CE Regulations for SRDs Operating in
License-Free 2.4 GHz/5 GHz Bands [1] and are recorded in the test report. The test procedure for
Occupied Channel Bandwidth measurement is described in the following steps:
- Connect the EUT as shown in Figure 2-1.
- Use Spectrum Analyzer as test
equipment.
- For detailed test procedure, see
clause 5.4.3.2.1 of EN 301 893 [4].
- Switch ON the EUT and other test
equipment.
- Set the Spectrum Analyzer to the
following settings:
- Center Frequency: The center
frequency of the channel under test
- Reference Level: 30dBm
- Frequency Span: >
2*Nominal Channel Bandwidth (for example, 40 MHz for a 20 MHz channel)
- RBW: 100 KHz
- VBW: 300 KHz
- Sweep Time: > 1 Sec
- Detector: RMS
- Trace Mode: Max Hold
- Use the Radio Testing Tool [9] to setup and configure the EUT. For setting and up configuring
the EUT, see the Radio Testing Tool User's Guide [10].
- Open the Radio Testing Tool [9] and setup the link with the EUT by using Setup tab.
- Open the Tx tab and set the
transmission mode to “Continuous”.
- Configure the EUT to the desired
parameters such as Channel/Frequency, Data Rate, Data Pattern, Power Level, and so
forth).
- Click on “ Start Tx Testing”.
- Observe the Tx signal on the spectrum
analyzer. When the trace is complete, find the peak power by using peak marker
function.
- Measure OCBW by using the 99%
bandwidth function of the spectrum analyzer and record it.
- Repeat the above for other data
rates/modulations and also other desired channels.
- The Occupied Channel Bandwidth (OCBW)
comply with the limits shown in the Limits on Nominal and Occupied Channel
Bandwidth table in CE Regulations for SRDs Operating in
License-Free 2.4 GHz/5 GHz Bands [1] for all the above test cases.