Specifications
ETSI
Final draft ETSI EN 300 328 V1.8.1 (2012
-
04)
57
For Frequency Hopping equipment operating in a normal operating (hopping not
disabled) mode, the sweep time shall be further increased to capture multiple
transmissions on the same hopping frequency in different hopping sequences.
Allow the trace to stabilize. Any emissions identified during the sweeps above that fall within the 6 dB range below the
applicable limit or above, shall be individually measured using the procedure in clause 5.3.10.2.1.2 and compared to the
limits given in tables 1 or 4.
Frequency Hopping equipment may generate a block (or several blocks) of spurious emissions anywhere within the
spurious domain. If this is the case, only the highest peak of each block of emissions shall be measured using the
procedure in clause 5.3.10.2.1.2.
Step 4:
• In case of conducted measurements on smart antenna systems (equipment with multiple transmit chains), the
steps 2 and 3 need to be repeated for each of the active transmit chains (A
ch
).
• The limits used to identifyemissions during this pre-scan need to be reduced with 10 × log
10
(A
ch
) (number of
active transmit chains).
5.3.10.2.1.2 Measurement of the emissions identified during the pre-scan
The steps below shall be used to accurately measure the individual unwanted emissions identified during the pre-scan
measurements above.
Step 1:
The level of the emissions shall be measured using the following spectrum analyser settings:
• Centre Frequency: Frequency of emission identified during the pre-scan
• Resolution Bandwidth: 100 kHz (< 1 GHz) / 1 MHz (> 1 GHz)
• Video Bandwidth: 300 kHz (< 1 GHz) / 3 MHz (> 1 GHz)
• Frequency Span: Wide enough to capture each individual emission indentified during the pre-scan
• Sweep mode: Continuous
• Sweep time: Auto
• Trigger: Free run
• Detector: RMS
• Trace Mode: Max Hold
Step 2:
In case of conducted measurements on smart antenna systems (equipment with multiple transmit chains), the step 1
needs to be repeated for each of the active transmit chains (A
ch
).
The trace data for each transmit chain has to be recorded.
Sum the power in each of the traces for each individual frequency bin.
Step 3:
Use the marker function to find the highest peak within the measurement trace and record its value and its frequency.
Step 4:
The measured values shall be compared to the limits defined in tables 1 and 4.